Bulk platinum-phosphorus glasses bearing nickel, palladium, silver, and gold
10161018 ยท 2018-12-25
Assignee
Inventors
- Jong Hyun Na (Pasadena, CA)
- Kyung-Hee Han (Pasadena, CA)
- Maximilien Launey (Pasadena, CA, US)
- Marios D. Demetriou (West Hollywood, CA)
- William L. Johnson (San Marino, CA)
Cpc classification
C22C45/003
CHEMISTRY; METALLURGY
International classification
Abstract
The disclosure provides PtP metallic glass-forming alloys and metallic glasses comprising at least two of Ni, Pd, Ag, and Au and optionally Si as well as potentially other elements, where the weight fraction of Pt is between 74 and 91 percent, and where the at least two of Ni, Pd, Ag, and Au contribute to increase the critical rod diameter of the alloy in relation to a PtP alloy free of Ni, Pd, Ag, and Au or a PtP alloy comprising only one of these elements. In embodiments where the PT850 hallmark is satisfied, alloys according to the disclosure are capable of forming metallic glass rods with diameters in excess of 3 mm, and in some embodiments 30 mm or larger.
Claims
1. An alloy capable of forming a metallic glass comprising: Pt having an atomic fraction in the range of 45 to 75 percent, where the weight fraction of Pt is between 74 and 91 percent; P having an atomic fraction in the range of 18 to 30 percent; at least two additional element selected from the group consisting of Ni, Pd, Ag, and Au where the atomic fraction of each of the at least two additional elements is in the range of 0.1 to 30 percent; Cu at an atomic fraction of less than 2 percent; and wherein the critical rod diameter of the alloy is at least 3 mm.
2. The alloy of claim 1, where the atomic fraction of Pt is in the range of 50 to 65 percent, the atomic fraction of P is in the range of 20 to 28 percent, the atomic fraction of each of the at least two additional elements selected from the group consisting of Ni, Pd, Ag, and Au is in the range of 0.1 to 26 percent, and wherein the Pt weight fraction is at least 85.0 percent.
3. A metallic glass comprising an alloy of claim 1.
4. An alloy capable of forming a metallic glass having a composition represented by the following formula (subscripts denote atomic percentages):
Pt.sub.(100-a-b-c-d-e)Ni.sub.aPd.sub.bAg.sub.cAu.sub.dP.sub.e where: a is up to 30; b is up to 30; c is up to 30; d is up to 30; e ranges from 18 to 30; wherein at least two of a, b, c, and d are at least 0.1; wherein the Pt weight fraction is between 74 and 91 percent; and wherein the critical rod diameter of the alloy is at least 3 mm.
5. The alloy of claim 4, where a, b, c, and d are up to 26, and wherein the Pt weight fraction is at least 85.0 percent.
6. The alloy of claim 4, where a ranges from 8 to 24, b ranges from 0.1 to 10, c and d are 0, and e ranges from 20 to 29.
7. The alloy of claim 4, where a ranges from 12 to 20, b ranges from 0.1 to 6, c and d are 0, e ranges from 22 to 27, and wherein the critical rod diameter of the alloy is at least 5 mm.
8. The alloy of claim 4, where a ranges from 4 to 20, c ranges from 0.1 to 10, b and d are 0, and e ranges from 20 to 28.
9. The alloy of claim 4, where a ranges from 7 to 19, c ranges from 0.2 to 8, b and d are 0, e ranges from 23 to 27, and wherein the critical rod diameter of the alloy is at least 5 mm.
10. The alloy of claim 4, where a ranges from 13 to 19, c ranges from 0.5 to 4, b and d are 0, e ranges from 24 to 26, and wherein the critical rod diameter of the alloy is at least 15 mm.
11. The alloy of claim 4, where a ranges from 6 to 26, d ranges from 0.1 to 8, b and c are 0, and e ranges from 20 to 28.
12. The alloy of claim 4, where a ranges from 10 to 22, d ranges from 0.1 to 6, b and c are 0, e ranges from 23 to 27, and wherein the critical rod diameter of the alloy is at least 5 mm.
13. The alloy of claim 4, where b ranges from 2 to 12, c ranges from 0.1 to 10, a and d are 0, and e ranges from 18 to 25.
14. The alloy of claim 4, b ranges from 3 to 11, c ranges from 3 to 9, a and d are 0, e ranges from 20 to 24, and wherein the critical rod diameter of the alloy is at least 4 mm.
15. A metallic glass comprising an alloy of claim 4.
16. An alloy capable of forming a metallic glass having a composition represented by the following formula (subscripts denote atomic percentages):
Pt.sub.(100-a-b-c-d-e)Ni.sub.aPd.sub.bAg.sub.cAu.sub.dP.sub.eSi.sub.f where: a is up to 30; b is up to 30; c is up to 30; d is up to 30; e ranges from 5 to 30; f is up to 20; wherein at least two of a, b, c, and d are at least 0.1; wherein the Pt weight fraction is between 74 and 91 percent; and wherein the critical rod diameter of the alloy is at least 3 mm.
17. The alloy of claim 16, where a, b, c, and d are up to 26, and wherein the Pt weight fraction is at least 85.0 percent.
18. The alloy of claim 16, where b ranges from 2 to 18, c ranges from 0.1 to 10, a and d are 0, e ranges from 10 to 28, and f ranges from 0.1 to 15.
19. The alloy of claim 16, b ranges from 6 to 13, c ranges from 2 to 7, a and d are 0, e ranges from 12 to 25, f ranges from 0.5 to 10, and wherein the critical rod diameter of the alloy is at least 4 mm.
20. A metallic glass comprising an alloy of claim 17.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
(1) The description will be more fully understood with reference to the following figures and data graphs, which are presented as various embodiments of the disclosure and should not be construed as a complete recitation of the scope of the disclosure, wherein:
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DETAILED DESCRIPTION
(29) The disclosure may be understood by reference to the following detailed description, taken in conjunction with the drawings as described below. It is noted that, for purposes of illustrative clarity, certain elements in various drawings may not be drawn to scale.
(30) Pt-based jewelry alloys typically contain Pt at weight fractions of less than 100%. Hallmarks are used by the jewelry industry to indicate the Pt metal content, or fineness, of a jewelry article by way of a mark, or marks, stamped, impressed, or struck on the metal. These marks may also be referred to as quality or purity marks. Although the Pt content associated with a hallmark varies from country to country, Pt weight fractions of about 75.0% (PT750), 80.0% (PT800), 85.0% (PT850), 90.0% (PT900), and 95.0% (PT950) are commonly used hallmarks in platinum jewelry. In certain embodiments, this disclosure is directed to glass-forming Pt-based alloys or metallic glasses that satisfy the PT750, PT800, PT850, and PT900 hallmarks. Hence, in such embodiments the Pt weight fraction does not exceed 91 percent, or alternatively it ranges from 74 to 91 percent. In other embodiments, this disclosure is directed to glass-forming Pt-based alloys and metallic glasses that satisfy the PT850 and PT900 hallmarks. Hence, in such embodiments the Pt weight fraction ranges from 84 to 91 percent. In yet other embodiments, this disclosure is directed to glass-forming Pt-based alloys or metallic glasses that satisfy the PT850 hallmark. Hence, in such embodiments the Pt weight fraction ranges from 84 to 87 percent. In yet other embodiments, this disclosure is directed to glass-forming Pt-based alloys or metallic glasses that satisfy the PT900 hallmark. Hence, in such embodiments the Pt weight fraction ranges from 89 to 91 percent. In yet other embodiments, this disclosure is directed to glass-forming Pt-based alloys and metallic glasses that satisfy the PT800 and PT850 hallmarks. Hence, in such embodiments the Pt weight fraction ranges from 79 to 86 percent.
(31) In accordance with the provided disclosure and drawings, PtP glass-forming alloys and metallic glasses bearing at least two of Ni, Pd, Ag, and Au are provided, where the at least two of Ni, Pd, Ag, and Au contribute to improve the glass-forming ability of the alloy in relation to a PtP alloy free of Ni, Pd, Ag, and Au or a PtP alloy comprising only one of these elements.
(32) In one embodiment of the disclosure, the glass-forming ability of each alloy is/can be quantified by the critical rod diameter, defined as the largest rod diameter in which the amorphous phase can be formed when processed by a method of water quenching a quartz tube having 0.5 mm thick walls containing a molten alloy.
(33) In the context of this disclosure, an alloy being free of a certain element means that the concentration of that element in the alloy is consistent with the concentration of an incidental impurity. In the context of this disclosure, the concentration of a certain element in an alloy being 0 means that the concentration of that element is consistent with the concentration of an incidental impurity. In various embodiments, the concentration of an incidental impurity is less than 2 atomic percent. In some embodiments, the concentration of an incidental impurity is less than 1 atomic percent, in other embodiments is less than 0.5 atomic percent, while in yet other embodiments is less than 0.1 atomic percent.
(34) Description of Ni- and Ag-Bearing PtP Alloys and Metallic Glass Compositions
(35) In some embodiments, the disclosure is directed to PtP alloys and metallic glasses that also bear Ni and Ag. In one embodiment, the disclosure provides an alloy capable of forming a metallic glass that comprises at least Pt and P, where the atomic fraction of Pt is in the range of 45 to 75 percent and the weight fraction of Pt is between 74 and 91 percent, while the atomic fraction of P is in the range of 15 to 30 percent. The alloy also comprises Ni and Ag, where the atomic fraction of Ni and Ag is each in the range of 0.1 to 30 percent. Among other additional elements, the alloy may additionally comprise Cu in an atomic fraction of less than 2 percent. The critical rod diameter of the alloy is at least 3 mm.
(36) In another embodiment, the atomic fraction of Pt is in the range of 50 to 65 percent, the atomic fraction of P is in the range of 20 to 28 percent, the atomic fraction of Ni and Ag is each in the range of 0.1 to 23 percent, and wherein the Pt weight fraction is at least 85.0 percent.
(37) In another embodiment, the disclosure is directed to an alloy capable of forming a metallic glass having a composition represented by the following formula (subscripts denote atomic percentages):
Pt.sub.(100-a-b-c)Ni.sub.aAg.sub.bP.sub.c
(38) where:
(39) a ranges from 0.1 to 30;
(40) b ranges from 0.1 to 30;
(41) c ranges from 15 to 30;
(42) wherein the Pt weight fraction is between 74 and 91 percent; and
(43) wherein the critical rod diameter of the alloy is at least 3 mm.
(44) In another embodiment, a ranges from 4 to 20, b ranges from 0.1 to 10, c ranges from 20 to 28, and the Pt weight fraction is at least 85.0 percent.
(45) To illustrate the effects of including both Ni and Ag in PtP alloys in terms of enhancing glass-forming ability, glass-forming ability data for PtP alloys that include both Ni and Ag are compared against PtP alloys that include only one of Ni and Ag. It is demonstrated that by adding Ag in PtNiP alloys, or by adding Ni in PtAgP alloys, the glass-forming ability of the quaternary alloys improve over the ternary alloys. It is also demonstrated that a certain Ni/Ag combination exists where a peak in glass-forming ability is reached in PtNiAgP alloys. At this peak, the critical rod diameter is many times larger than the critical rod diameter of the two ternary alloys PtNiP and PtAgP.
(46) Specific embodiments of metallic glasses formed of PtP alloys comprising Ni with compositions according to the formula Pt.sub.57.20.3xNi.sub.22.80.7xP.sub.20+x with a Pt weight fraction of at least 85.0 percent satisfying the PT850 hallmark are presented in Table 1. In these alloys, the atomic fraction of P varies from 21 to 27 percent, the atomic fraction of Ni varies from about 17 to about 23 percent, and the atomic fraction of Pt varies from about 55 to about 57 percent, while all alloys have weight fractions of Pt of at least 85.0 percent. The critical rod diameters of the example alloys along with the Pt weight percentage are also listed in Table 1.
(47) TABLE-US-00001 TABLE 1 Sample metallic glasses demonstrating the effect of increasing the P atomic concentration according to the formula Pt.sub.57.20.3xNi.sub.22.80.7xP.sub.20+x on the glass-forming ability of the alloys Critical Rod Example Composition Pt wt. % Diameter [mm] 1 Pt.sub.56.9Ni.sub.22.1P.sub.21 85.1 2 2 Pt.sub.56.6Ni.sub.21.4P.sub.22 85.1 4 3 Pt.sub.56.4Ni.sub.21.1P.sub.22.5 85.0 5 4 Pt.sub.56.3Ni.sub.20.7P.sub.23 85.1 5 5 Pt.sub.56.1Ni.sub.20.4P.sub.23.5 85.0 6 6 Pt.sub.56Ni.sub.20P.sub.24 85.0 7 7 Pt.sub.55.8Ni.sub.19.7P.sub.24.5 85.0 7 8 Pt.sub.55.7Ni.sub.19.3P.sub.25 85.1 7 9 Pt.sub.55.4Ni.sub.18.6P.sub.26 85.1 6 10 Pt.sub.55.1Ni.sub.17.9P.sub.27 85.1 2
(48) As shown in Table 1 and
(49)
(50) TABLE-US-00002 TABLE 2 Sample metallic glasses demonstrating the effect of increasing the P atomic concentration according to the formula Pt.sub.57.20.3xNi.sub.22.80.7xP.sub.20+x on the glass-transition, crystallization, solidus, and liquidus temperatures T.sub.g T.sub.x T.sub.x T.sub.s T.sub.l Example Composition ( C.) ( C.) ( C.) ( C.) ( C.) 1 Pt.sub.56.9Ni.sub.22.1P.sub.21 203.3 254.1 50.8 488.1 541.5 2 Pt.sub.56.6Ni.sub.21.4P.sub.22 203.8 262.5 58.7 488.0 543.6 4 Pt.sub.56.3Ni.sub.20.7P.sub.23 202.9 270.3 67.4 485.9 530.6 7 Pt.sub.55.8Ni.sub.19.7P.sub.24.5 209.0 276.3 67.3 483.4 565.2 9 Pt.sub.55.4Ni.sub.18.6P.sub.26 209.9 276.4 66.5 489.8 589.7 10 Pt.sub.55.1Ni.sub.17.9P.sub.27 214.4 276.6 62.2 491.4 588.4
(51) Specific embodiments of metallic glasses formed of PtP alloys comprising Ag with compositions according to the formula Pt.sub.640.55xAg.sub.140.45xP.sub.22+x with Pt weight fraction of at least 85.0 percent satisfying the PT850 hallmark are presented in Table 3. In these alloys, the atomic fraction of P varies from 22 to 28 percent, the atomic fraction of Ag varies from about 11 to 14 percent, and the atomic fraction of Pt varies from about 60 to 64 percent, while all alloys have weight fractions of Pt of at least 85.0 percent. The critical rod diameters of the example alloys along with the Pt weight percentage are also listed in Table 3.
(52) TABLE-US-00003 TABLE 3 Sample metallic glasses demonstrating the effect of increasing the P atomic concentration according to the formula Pt.sub.640.55xAg.sub.140.45xP.sub.22+x on the glass-forming ability of the alloys Critical Rod Example Composition Pt wt. % Diameter [mm] 11 Pt.sub.64Ag.sub.14P.sub.22 85.1 <0.5 12 Pt.sub.63.5Ag.sub.13.5P.sub.23 85.1 0.5 13 Pt.sub.62.6Ag.sub.12.9P.sub.24.5 85.0 0.5 14 Pt.sub.61.8Ag.sub.12.2P.sub.26 85.0 1 15 Pt.sub.61.3Ag.sub.11.7P.sub.27 85.1 0.5 16 Pt.sub.60.7Ag.sub.11.3P.sub.28 85.0 <0.5
(53) As shown in Table 3 and
(54)
(55) TABLE-US-00004 TABLE 4 Sample metallic glasses demonstrating the effect of increasing the P atomic concentration according to the formula Pt.sub.640.55xAg.sub.140.45xP.sub.22+x on the glass-transition, crystallization, solidus, and liquidus temperatures T.sub.g T.sub.x T.sub.x T.sub.s T.sub.l Example Composition ( C.) ( C.) ( C.) ( C.) ( C.) 12 Pt.sub.63.5Ag.sub.13.5P.sub.23 246.6 289.0 42.4 578.3 686.0 13 Pt.sub.62.6Ag.sub.12.9P.sub.24.5 259.2 288.6 29.4 672.1 693.7 14 Pt.sub.61.8Ag.sub.12.2P.sub.26 267.6 285.2 17.6 670.8 699.8 15 Pt.sub.61.3Ag.sub.11.7P.sub.27 268.1 283.1 15.0 669.5 696.7
(56) Specific embodiments of metallic glasses formed of PtP alloys comprising both Ni and Ag with compositions according to the formula Pt.sub.55.8+0.5xNi.sub.19.7-1.5xAg.sub.xP.sub.24.5 with Pt weight fraction of at least 85.0 percent satisfying the PT850 hallmark are presented in Table 5. In these alloys, the atomic fraction of Ni varies from about 4 to about 20 percent, the atomic fraction of Ag varies from 1 to about 13 percent, the atomic fraction of Pt varies from about 55 to about 68 percent, and the atomic fraction of P is constant at 24.5 percent, while all alloys have weight fractions of Pt of at least 85.0 percent. The critical rod diameters of the example alloys along with the Pt weight percentage are also listed in Table 5.
(57) TABLE-US-00005 TABLE 5 Sample metallic glasses demonstrating the effect of varying the Ni and Ag atomic concentrations according to the formula Pt.sub.55.8+0.5xNi.sub.19.71.5xAg.sub.xP.sub.24.5 on the glass-forming ability of the alloys Critical Rod Example Composition Pt wt. % Diameter [mm] 7 Pt.sub.55.8Ni.sub.19.7P.sub.24.5 85.0 7 17 Pt.sub.56.3Ni.sub.18.2Ag.sub.1P.sub.24.5 85.0 21 18 Pt.sub.56.6Ni.sub.17.4Ag.sub.1.5P.sub.24.5 85.0 24 19 Pt.sub.56.9Ni.sub.16.6Ag.sub.2P.sub.24.5 85.1 30 20 Pt.sub.57.2Ni.sub.15.8Ag.sub.2.5P.sub.24.5 85.1 24 21 Pt.sub.57.4Ni.sub.15.1Ag.sub.3P.sub.24.5 85.0 20 22 Pt.sub.57.7Ni.sub.14.3Ag.sub.3.5P.sub.24.5 85.1 20 23 Pt.sub.57.9Ni.sub.13.6Ag.sub.4P.sub.24.5 85.0 13 24 Pt.sub.58.4Ni.sub.12.1Ag.sub.5P.sub.24.5 85.0 12 25 Pt.sub.59.7Ni.sub.8.3Ag.sub.7.5P.sub.24.5 85.0 6 26 Pt.sub.61.1Ni.sub.4.4Ag.sub.10P.sub.24.5 85.0 3 13 Pt.sub.62.6Ag.sub.12.9P.sub.24.5 85.0 0.5
(58) As shown in Table 5 and
(59)
(60) TABLE-US-00006 TABLE 6 Sample metallic glasses demonstrating the effect of varying the atomic fractions of Ni and Ag according to the formula Pt.sub.55.8+0.5xNi.sub.19.71.5xAg.sub.xP.sub.24.5 on the glass-transition, crystallization, solidus, and liquidus temperatures of the alloys T.sub.g T.sub.x T.sub.x T.sub.s T.sub.l Example Composition ( C.) ( C.) ( C.) ( C.) ( C.) 7 Pt.sub.55.8Ni.sub.19.7P.sub.24.5 209.0 276.3 67.3 483.4 565.2 17 Pt.sub.56.3Ni.sub.18.2Ag.sub.1P.sub.24.5 210.1 288.2 78.1 484.0 569.6 19 Pt.sub.56.9Ni.sub.16.6Ag.sub.2P.sub.24.5 212.0 293.0 81.0 484.1 577.0 21 Pt.sub.57.4Ni.sub.15.1Ag.sub.3P.sub.24.5 216.4 279.3 62.9 485.2 589.1 24 Pt.sub.58.4Ni.sub.12.1Ag.sub.5P.sub.24.5 223.4 279.6 56.2 489.7 612.5 25 Pt.sub.59.7Ni.sub.8.3Ag.sub.7.5P.sub.24.5 225.1 273.9 48.8 489.7 629.0 26 Pt.sub.61.1Ni.sub.4.4Ag.sub.10P.sub.24.5 237.7 285.2 47.5 488.8 653.1 13 Pt.sub.62.6Ag.sub.12.9P.sub.24.5 259.2 288.6 29.4 672.1 693.7
(61) As shown in Tables 5 and 6 and
(62) Description of Pd- and Ag-Bearing PtP Alloys and Metallic Glass Compositions
(63) In some embodiments, the disclosure is directed to PtP alloys and metallic glasses that also bear Pd and Ag. In one embodiment, the disclosure provides an alloy capable of forming a metallic glass that comprises at least Pt and P, where the atomic fraction of Pt is in the range of 45 to 75 percent and the weight fraction of Pt is between 74 and 91 percent, while the atomic fraction of P is in the range of 15 to 30 percent. The alloy also comprises Pd and Ag, where the atomic fraction of Pd and Ag is each in the range of 0.1 to 30 percent. Among other additional elements, the alloy may additionally comprise Cu in an atomic fraction of less than 2 percent. The critical rod diameter of the alloy is at least 3 mm.
(64) In another embodiment, the atomic fraction of Pt is in the range of 50 to 65 percent, the atomic fraction of P is in the range of 20 to 28 percent, the atomic fraction of Pd and Ag is each in the range of 0.1 to 23 percent, and wherein the Pt weight fraction is at least 85.0 percent.
(65) In another embodiment, the disclosure is directed to an alloy capable of forming a metallic glass having a composition represented by the following formula (subscripts denote atomic percentages):
Pt.sub.(100-a-b-c)Pd.sub.aAg.sub.bP.sub.c
(66) where:
(67) a ranges from 0.1 to 30;
(68) b ranges from 0.1 to 30;
(69) c ranges from 15 to 30;
(70) wherein the Pt weight fraction is between 74 and 91 percent; and
(71) wherein the critical rod diameter of the alloy is at least 3 mm.
(72) In another embodiment, a ranges from 2 to 12, b ranges from 0.1 to 10, c ranges from 18 to 25, and the Pt weight fraction is at least 85.0 percent.
(73) To illustrate the effects of including both Pd and Ag in PtP alloys in terms of enhancing glass-forming ability, glass-forming ability data for PtP alloys that include both Pd and Ag are compared against PtP alloys that include only one of Pd and Ag. It is demonstrated that by adding Ag in PtPdP alloys, or by adding Pd in PtAgP alloys, the glass-forming ability of the quaternary alloys improve over the ternary alloys. It is also demonstrated that a certain Pd/Ag combination exists where a peak in glass-forming ability is reached in PtPdAgP alloys. At this peak, the critical rod diameter is many times larger than the critical rod diameter of the two ternary alloys PtPdP and PtAgP.
(74) Specific embodiments of metallic glasses formed of PtP alloys comprising both Pd and Ag with compositions according to the formula Pt.sub.63.5Pd.sub.13.5xAg.sub.xP.sub.23 with Pt weight fraction of at least 85.0 percent satisfying the PT850 hallmark are presented in Table 7. In these alloys, the atomic fraction of Pd varies from about 4 to about 13.5 percent, the atomic fraction of Ag varies from 1 to about 13.5 percent, the atomic fraction of Pt is constant at 63.5 percent, and the atomic fraction of P is constant at 23 percent, while all alloys have weight fractions of Pt of at least 85.0 percent. The critical rod diameters of the example alloys along with the Pt weight percentage are also listed in Table 7.
(75) TABLE-US-00007 TABLE 7 Sample metallic glasses demonstrating the effect of varying the Ni and Ag atomic concentrations according to the formula Pt.sub.63.5Pd.sub.13.5xAg.sub.xP.sub.23 on the glass-forming ability of the alloys Critical Rod Example Composition Pt wt. % Diameter [mm] 27 Pt.sub.63.5Pd.sub.13.5P.sub.23 85.2 <0.5 28 Pt.sub.63.5Pd.sub.11.5Ag.sub.2P.sub.23 85.2 1 29 Pt.sub.63.5Pd.sub.10.5Ag.sub.3P.sub.23 85.2 2 30 Pt.sub.63.5Pd.sub.9.5Ag.sub.4P.sub.23 85.2 4 31 Pt.sub.63.5Pd.sub.9Ag.sub.4.5P.sub.23 85.2 5 32 Pt.sub.63.5Pd.sub.8.5Ag.sub.5P.sub.23 85.2 4 33 Pt.sub.63.5Pd.sub.7.5Ag.sub.6P.sub.23 85.2 3 34 Pt.sub.63.5Pd.sub.4.5Ag.sub.9P.sub.23 85.1 2 12 Pt.sub.63.5Ag.sub.13.5P.sub.23 85.1 0.5
(76) As shown in Table 7 and
(77)
(78) TABLE-US-00008 TABLE 8 Sample metallic glasses demonstrating the effect of varying the atomic fractions of Pd and Ag according to the formula Pt.sub.63.5Pd.sub.13.5xAg.sub.xP.sub.23 on the glass-transition, crystallization, solidus, and liquidus temperatures of the alloys T.sub.g T.sub.x T.sub.x T.sub.s T.sub.l Example Composition ( C.) ( C.) (K) ( C.) ( C.) 28 Pt.sub.63.5Pd.sub.11.5Ag.sub.2P.sub.23 218.2 275.6 57.4 528.8 597.1 29 Pt.sub.63.5Pd.sub.10.5Ag.sub.3P.sub.23 218.8 281.1 62.3 528.0 590.7 30 Pt.sub.63.5Pd.sub.9.5Ag.sub.4P.sub.23 221.5 281.8 60.3 523.6 594.0 31 Pt.sub.63.5Pd.sub.9Ag.sub.4.5P.sub.23 222.2 284.7 62.5 522.5 595.2 32 Pt.sub.63.5Pd.sub.8.5Ag.sub.5P.sub.23 222.6 287.1 64.5 526.4 600.7 33 Pt.sub.63.5Pd.sub.7.5Ag.sub.6P.sub.23 228.5 294.1 65.6 521.5 611.4 34 Pt.sub.63.5Pd.sub.4.5Ag.sub.9P.sub.23 232.7 301.2 68.5 542.0 646.9 12 Pt.sub.63.5Ag.sub.13.5P.sub.23 246.6 289.0 42.4 578.3 686.0
(79) Specific embodiments of metallic glasses formed of PtP alloys comprising both Pd and Ag with compositions according to the formula Pt.sub.650.5xPd.sub.10.50.5xAg.sub.4.5P.sub.20+x with Pt weight fraction of at least 85.0 percent satisfying the PT850 hallmark are presented in Table 9. In these alloys, the atomic fraction of Pd varies from 8 to about 11.5 percent, the atomic fraction of Ag is constant at 4.5 percent, the atomic fraction of Pt varies from 62.5 to 66 percent, and the atomic fraction of P varies from 18 to 25 percent, while all alloys have weight fractions of Pt of at least 85.0 percent. The critical rod diameters of the example alloys along with the Pt weight percentage are also listed in Table 9.
(80) TABLE-US-00009 TABLE 9 Sample metallic glasses demonstrating the effect of increasing the P atomic concentration according to the formula Pt.sub.650.5xPd.sub.10.50.5xAg.sub.4.5P.sub.20+x on the glass-forming ability of the alloys Critical Rod Example Composition Pt wt. % Diameter [mm] 35 Pt.sub.66Pd.sub.11.5Ag.sub.4.5P.sub.18 85.0 1 36 Pt.sub.65.5Pd.sub.11Ag.sub.4.5P.sub.19 85.1 2 37 Pt.sub.65Pd.sub.10.5Ag.sub.4.5P.sub.20 85.1 3 38 Pt.sub.64.5Pd.sub.10Ag.sub.4.5P.sub.21 85.1 4 39 Pt.sub.64Pd.sub.9.5Ag.sub.4.5P.sub.22 85.1 6 40 Pt.sub.63.75Pd.sub.9.25Ag.sub.4.5P.sub.22.5 85.2 7 31 Pt.sub.63.5Pd.sub.9Ag.sub.4.5P.sub.23 85.2 5 41 Pt.sub.63Pd.sub.8.5Ag.sub.4.5P.sub.24 85.2 2 42 Pt.sub.62.5Pd.sub.8Ag.sub.4.5P.sub.25 85.2 1
(81) As shown in Table 9 and
(82)
(83) TABLE-US-00010 TABLE 10 Sample metallic glasses demonstrating the effect of varying the atomic fractions of Pt, Pd and P according to the formula Pt.sub.650.5xPd.sub.10.50.5xAg.sub.4.5P.sub.20+x on the glass-transition, crystallization, solidus, and liquidus temperatures of the alloys T.sub.g T.sub.x T.sub.x T.sub.s T.sub.l Example Composition ( C.) ( C.) (K) ( C.) ( C.) 36 Pt.sub.65.5Pd.sub.11Ag.sub.4.5P.sub.19 227.1 291.0 63.9 553.5 580.7 37 Pt.sub.65Pd.sub.10.5Ag.sub.4.5P.sub.20 226.4 273.5 47.1 548.2 579.3 38 Pt.sub.64.5Pd.sub.10Ag.sub.4.5P.sub.21 224.9 274.5 49.6 543.9 577.3 39 Pt.sub.64Pd.sub.9.5Ag.sub.4.5P.sub.22 224.4 272.5 48.1 543.3 579.1 40 Pt.sub.63.75Pd.sub.9.25Ag.sub.4.5P.sub.22.5 222.4 287.2 64.8 525.4 582.7 31 Pt.sub.63.5Pd.sub.9Ag.sub.4.5P.sub.23 222.2 284.7 62.5 522.5 595.2 41 Pt.sub.63Pd.sub.8.5Ag.sub.4.5P.sub.24 227.4 291.7 64.3 546.3 602.8 42 Pt.sub.62.5Pd.sub.8Ag.sub.4.5P.sub.25 228.1 297.3 69.2 555.2 644.2
(84) Other metallic glasses according to embodiments of the disclosure with Pt weight fraction of at least 85.0 percent satisfying the PT850 hallmark are presented in Table 11. The critical rod diameters of the example alloys along with the Pt weight percentage are also listed in Table 11.
(85) TABLE-US-00011 TABLE 11 Other metallic glasses according to embodiments of the disclosure Critical Rod Example Composition Pt wt. % Diameter [mm] 43 Pt.sub.64.5Pd.sub.8.5Ag.sub.4.5P.sub.22.5 85.8 7 44 Pt.sub.64.75Pd.sub.8.5Ag.sub.4.5P.sub.22.25 85.9 8 45 Pt.sub.65Pd.sub.8.5Ag.sub.4.5P.sub.22 86.0 9 46 Pt.sub.65.25Pd.sub.8.25Ag.sub.4.5P.sub.22 86.2 9 47 Pt.sub.65.5Pd.sub.8Ag.sub.4.5P.sub.22 86.4 9 48 Pt.sub.66Pd.sub.7.5Ag.sub.4.5P.sub.22 86.8 8
(86) As shown in Tables 7-11, alloys Pt.sub.65Pd.sub.8.5Ag.sub.4.5P.sub.22 (Example 44), Pt.sub.65.25Pd.sub.8.25Ag.sub.4.5P.sub.22 (Example 45), and Pt.sub.65.5Pd.sub.8Ag.sub.4.5P.sub.22 (Example 46) have the highest glass-forming ability among PtPdAgP alloys that satisfy the PT850 hallmark, demonstrating a critical rod diameter of 9 mm.
(87) TABLE-US-00012 TABLE 12 Thermophysical and mechanical properties for Sample metallic glass Pt.sub.65Pd.sub.8.5Ag.sub.4.5P.sub.22 (Example 45) Glass-transition temperature 223.0 C. Crystallization temperature 293.5 C. T.sub.x(=T.sub.x T.sub.g) 70.5 C. Glass-transition temperature 223.0 C. Solidus temperature 525.3 C. Liquidus temperature 575.4 C. Hardness 374.3 1.4 HV
(88) Description of Ni- and Au-Bearing PtP Alloys and Metallic Glass Compositions
(89) In some embodiments, the disclosure is directed to PtP alloys and metallic glasses that also bear Ni and Au. In one embodiment, the disclosure provides an alloy capable of forming a metallic glass that comprises at least Pt and P, where the atomic fraction of Pt is in the range of 45 to 75 percent and the weight fraction of Pt is between 74 and 91 percent, while the atomic fraction of P is in the range of 15 to 30 percent. The alloy also comprises Ni and Au, where the atomic fraction of Ni and Au is each in the range of 0.1 to 30 percent. Among other additional elements, the alloy may additionally comprise Cu in an atomic fraction of less than 2 percent. The critical rod diameter of the alloy is at least 3 mm.
(90) In another embodiment, the atomic fraction of Pt is in the range of 50 to 65 percent, the atomic fraction of P is in the range of 20 to 28 percent, the atomic fraction of Ni and Au is each in the range of 0.1 to 23 percent, and wherein the Pt weight fraction is at least 85.0 percent.
(91) In another embodiment, the disclosure is directed to an alloy capable of forming a metallic glass having a composition represented by the following formula (subscripts denote atomic percentages):
Pt.sub.(100-a-b-c)Ni.sub.aAu.sub.bP.sub.c
(92) where:
(93) a ranges from 0.1 to 30;
(94) b ranges from 0.1 to 30;
(95) c ranges from 15 to 30;
(96) wherein the Pt weight fraction is between 74 and 91 percent; and
(97) wherein the critical rod diameter of the alloy is at least 3 mm.
(98) In another embodiment, a ranges from 6 to 26, b ranges from 0.1 to 8, c ranges from 20 to 28, and the Pt weight fraction is at least 85.0 percent.
(99) To illustrate the effects of including both Ni and Au in PtP alloys in terms of enhancing glass-forming ability, glass-forming ability data for PtP alloys that include both Ni and Au is compared against PtP alloys that include only Ni. It is demonstrated that by adding Au in PtNiP alloys the glass-forming ability of the quaternary alloys improve over the ternary alloys. It is also demonstrated that a certain Ni/Au combination exists where a peak in glass-forming ability is reached in PtNiAuP alloys. At this peak, the critical rod diameter is many times larger than the critical rod diameter of the ternary alloy PtNiP.
(100) Specific embodiments of metallic glasses formed of PtP alloys comprising both Ni and Au with compositions according to the formula Pt.sub.55.8+1.5xNi.sub.19.72.5xAu.sub.xP.sub.24.5 with Pt weight fraction of at least 85.0 percent satisfying the PT850 hallmark, are presented in Table 13. In these alloys, the atomic fraction of Ni varies from about 12 to about 20 percent, the atomic fraction of Au varies from greater than 0 up to about 3 percent, the atomic fraction of Pt varies from about 55 to about 61 percent, and the atomic fraction of P is constant at 24.5 percent, while all alloys have weight fractions of Pt of at least 85.0 percent. The critical rod diameters of the example alloys along with the Pt weight percentage are also listed in Table 13.
(101) TABLE-US-00013 TABLE 13 Sample metallic glasses demonstrating the effect of varying the Ni and Ag atomic concentrations according to the formula Pt.sub.55.8+1.5xNi.sub.19.72.5xAu.sub.xP.sub.24.5 on the glass-forming ability of the alloys Critical Rod Example Composition Pt wt. % Diameter [mm] 7 Pt.sub.55.8Ni.sub.19.7P.sub.24.5 85.0 7 49 Pt.sub.56.5Ni.sub.18.5Au.sub.0.5P.sub.24.5 85.0 17 50 Pt.sub.57.3Ni.sub.17.2Au.sub.1P.sub.24.5 85.0 25 51 Pt.sub.58Ni.sub.16Au.sub.1.5P.sub.24.5 85.0 15 52 Pt.sub.58.8Ni.sub.14.7Au.sub.2P.sub.24.5 85.1 9 53 Pt.sub.59.5Ni.sub.13.5Au.sub.2.5P.sub.24.5 85.0 6 54 Pt.sub.60.3Ni.sub.12.2Au.sub.3P.sub.24.5 85.1 4
(102) As shown in Table 13 and
(103)
(104) TABLE-US-00014 TABLE 14 Sample metallic glasses demonstrating the effect of varying the atomic fractions of Ni and Ag according to the formula Pt.sub.55.8+1.5xNi.sub.19.72.5xAu.sub.xP.sub.24.5 on the glass-transition, crystallization, solidus, and liquidus temperatures of the alloys T.sub.g T.sub.x T.sub.x T.sub.s T.sub.l Example Composition ( C.) ( C.) (K) ( C.) ( C.) 7 Pt.sub.55.8Ni.sub.19.7P.sub.24.5 209.0 276.3 67.3 483.4 565.2 49 Pt.sub.56.5Ni.sub.18.5Au.sub.0.5P.sub.24.5 207.3 278.8 71.5 476.8 571.5 50 Pt.sub.57.3Ni.sub.17.2Au.sub.1P.sub.24.5 207.3 281.0 73.7 478.2 579.0 51 Pt.sub.58Ni.sub.16Au.sub.1.5P.sub.24.5 208.0 285.6 77.6 477.9 584.7 52 Pt.sub.58.8Ni.sub.14.7Au.sub.2P.sub.24.5 208.3 258.3 50.0 479.5 596.8 53 Pt.sub.59.5Ni.sub.13.5Au.sub.2.5P.sub.24.5 207.2 251.2 44.0 481.8 599.1 54 Pt.sub.60.3Ni.sub.12.2Au.sub.3P.sub.24.5 207.0 266.4 59.4 479.5 609.0
(105) As shown in Table 13, alloy Pt.sub.57.3Ni.sub.17.2Au.sub.1P.sub.24.5 (Example 50) has the highest glass-forming ability among PtNiAuP alloys that satisfy the PT850 hallmark, demonstrating a critical rod diameter of 25 mm.
(106) TABLE-US-00015 TABLE 15 Thermophysical and mechanical properties for Sample metallic glass Pt.sub.57.3Ni.sub.17.2Au.sub.1P.sub.24.5 (Example 50) Glass-transition temperature 207.3 C. Crystallization temperature 281.0 C. T.sub.x(=T.sub.x T.sub.g) 73.7 C. Solidus temperature 478.2 C. Liquidus temperature 579.0 C. Hardness 418.0 3.0 HV
(107) Description of Ni- and Pd-Bearing PtP Alloys and Metallic Glass Compositions
(108) In some embodiments, the disclosure is directed to PtP alloys and metallic glasses that also bear Ni and Pd. In one embodiment, the disclosure provides an alloy capable of forming a metallic glass that comprises at least Pt and P, where the atomic fraction of Pt is in the range of 45 to 75 percent and the weight fraction of Pt is between 74 and 91 percent, while the atomic fraction of P is in the range of 18 to 30 percent. The alloy also comprises Ni and Pd, where the atomic fraction of Ni and Pd is each in the range of 0.1 to 30 percent. Among other additional elements, the alloy may additionally comprise Cu in an atomic fraction of less than 2 percent. The critical rod diameter of the alloy is at least 3 mm.
(109) In another embodiment, the atomic fraction of Pt is in the range of 50 to 65 percent, the atomic fraction of P is in the range of 20 to 28 percent, the atomic fraction of Ni is in the range of 0.1 to 25 percent, the atomic fraction of Pd is in the range of 0.1 to 10 percent, and wherein the Pt weight fraction is at least 85.0 percent.
(110) In another embodiment, the disclosure is directed to an alloy capable of forming a metallic glass having a composition represented by the following formula (subscripts denote atomic percentages):
Pt.sub.(100-a-b-c)Ni.sub.aPd.sub.bP.sub.c
(111) where:
(112) a ranges from 0.1 to 30;
(113) b ranges from 0.1 to 30;
(114) c ranges from 18 to 30;
(115) wherein the Pt weight fraction is between 74 and 91 percent; and
(116) wherein the critical rod diameter of the alloy is at least 3 mm.
(117) In another embodiment, a ranges from 8 to 24, b ranges from 0.1 to 10, c ranges from 20 to 28, and the Pt weight fraction is at least 85.0 percent.
(118) To illustrate the effects of including both Ni and Pd in PtP alloys in terms of enhancing glass-forming ability, glass-forming ability data for PtP alloys that include both Ni and Pd is compared against PtP alloys that include only Ni. It is demonstrated that by adding Pd in PtNiP alloys the glass-forming ability of the quaternary alloys improve over the ternary alloys. It is also demonstrated that a certain Ni/Pd combination exists where a peak in glass-forming ability is reached in PtNiPdP alloys. At this peak, the critical rod diameter is many times larger than the critical rod diameter of the ternary alloy PtNiP.
(119) Specific embodiments of metallic glasses formed of PtP alloys comprising both Ni and Pd with compositions according to the formula Pt.sub.55.8+0.55xNi.sub.19.71.55xPd.sub.xP.sub.24.5 with Pt weight fraction of at least 85.0 percent satisfying the PT850 hallmark, are presented in Table 16. In these alloys, the atomic fraction of Ni varies from about 10 to about 20 percent, the atomic fraction of Pd varies from greater than 0 up to about 6 percent, the atomic fraction of Pt varies from about 55 to about 60 percent, and the atomic fraction of P is constant at 24.5 percent, while all alloys have weight fractions of Pt of at least 85.0 percent. The critical rod diameters of the example alloys along with the Pt weight percentage are also listed in Table 16.
(120) TABLE-US-00016 TABLE 16 Sample metallic glasses demonstrating the effect of increasing the Pd atomic concentration according to the formula Pt.sub.55.8+0.55xNi.sub.19.71.55xPd.sub.xP.sub.24.5 on the glass forming ability of the alloys Pt wt. Critical Rod Example Composition % Diameter [mm] 7 Pt.sub.55.8Ni.sub.19.7P.sub.24.5 85.0 7 55 Pt.sub.56.4Ni.sub.18.1Pd.sub.1P.sub.24.5 85.1 15 56 Pt.sub.56.6Ni.sub.17.4Pd.sub.1.5P.sub.24.5 85.1 19 57 Pt.sub.56.9Ni.sub.16.6Pd.sub.2P.sub.24.5 85.1 24 58 Pt.sub.57.2Ni.sub.15.8Pd.sub.2.5P.sub.24.5 85.1 26 59 Pt.sub.57.5Ni.sub.15Pd.sub.3P.sub.24.5 85.1 22 60 Pt.sub.58Ni.sub.13.5Pd.sub.4P.sub.24.5 85.1 14 61 Pt.sub.58.6Ni.sub.11.9Pd.sub.5P.sub.24.5 85.2 11 62 Pt.sub.59.1Ni.sub.10.4Pd.sub.6P.sub.24.5 85.2 6
(121) As shown in Table 16 and
(122)
(123) TABLE-US-00017 TABLE 17 Sample metallic glasses demonstrating the effect of increasing the Pd atomic concentration according to the formula Pt.sub.55.8+0.55xNi.sub.19.7-1.55xPd.sub.xP.sub.24.5 on the glass-transition, crystallization, solidus, and liquidus temperatures of the alloys T.sub.g T.sub.x T.sub.x T.sub.s T.sub.l Example Composition ( C.) ( C.) (K) ( C.) ( C.) 7 Pt.sub.55.8Ni.sub.19.7P.sub.24.5 209.0 276.3 67.3 483.4 565.2 55 Pt.sub.56.4Ni.sub.18.1Pd.sub.1P.sub.24.5 202.8 276.9 74.1 482.6 568.3 56 Pt.sub.56.6Ni.sub.17.4Pd.sub.1.5P.sub.24.5 205.5 278.3 72.8 486.0 564.8 57 Pt.sub.56.9Ni.sub.16.6Pd.sub.2P.sub.24.5 205.9 270.4 64.5 485.6 570.0 58 Pt.sub.57.2Ni.sub.15.8Pd.sub.2.5P.sub.24.5 202.0 279.6 77.6 488.6 575.1 59 Pt.sub.57.5Ni.sub.15Pd.sub.3P.sub.24.5 204.8 284.4 79.6 489.2 582.0 60 Pt.sub.58Ni.sub.13.5Pd.sub.4P.sub.24.5 203.3 273.3 70.0 488.4 583.1 61 Pt.sub.58.6Ni.sub.11.9Pd.sub.5P.sub.24.5 203.4 274.9 71.5 488.4 580.6 62 Pt.sub.59.1Ni.sub.10.4Pd.sub.6P.sub.24.5 203.1 273.4 70.3 485.0 585.2
(124) Description of Pd-, Ag-, and Si-Bearing PtP Alloys and Metallic Glass Compositions
(125) In some embodiments, the disclosure is directed to PtP alloys and metallic glasses that also bear Pd, Ag, and Si. In one embodiment, the disclosure provides an alloy capable of forming a metallic glass that comprises at least Pt and P, where the atomic fraction of Pt is in the range of 45 to 75 percent and the weight fraction of Pt is between 74 and 91 percent, while the atomic fraction of P is in the range of 15 to 30 percent. The alloy also comprises Pd and Ag, where the atomic fraction of Pd and Ag is each in the range of 0.1 to 30 percent, and may also comprise Si in an atomic fraction of up 20 percent. Among other additional elements, the alloy may additionally comprise Cu in an atomic fraction of less than 2 percent. The critical rod diameter of the alloy is at least 3 mm.
(126) In another embodiment, the atomic fraction of Pt is in the range of 50 to 65 percent, the atomic fraction of P is in the range of 10 to 28 percent, the atomic fraction of Pd and Ag is each in the range of 0.1 to 23 percent, the atomic fraction of Si is in the range of 0.1 to 15 percent, and wherein the Pt weight fraction is at least 85.0 percent.
(127) In another embodiment, the disclosure is directed to an alloy capable of forming a metallic glass having a composition represented by the following formula (subscripts denote atomic percentages):
Pt.sub.(100-a-b-c)Pd.sub.aAg.sub.bP.sub.cSi.sub.d
(128) where:
(129) a ranges from 0.1 to 30;
(130) b ranges from 0.1 to 30;
(131) c ranges from 5 to 30;
(132) d is up to 20;
(133) wherein the Pt weight fraction is between 74 and 91 percent; and
(134) wherein the critical rod diameter of the alloy is at least 3 mm.
(135) In another embodiment, a ranges from 2 to 18, b ranges from 0.1 to 10, c ranges from 10 to 28, d ranges from 0.1 to 15, and the Pt weight fraction is at least 85.0 percent.
(136) Specific embodiments of metallic glasses formed of PtP alloys comprising Pd, Ag and Si with compositions according to the formula Pt.sub.63.5Pd.sub.9.5Ag.sub.4P.sub.23xSi.sub.x with Pt weight fraction of at least 85.0 percent satisfying the PT850 hallmark are presented in Table 18. In these alloys, the atomic fraction of Si increases from 0 to 15 percent while the atomic fraction of P decreases from 23 to 8 percent. The atomic fraction of Pt is constant at 63.5 percent, the atomic fraction of Pd is constant at 9.5 percent, and the atomic fraction of Ag is constant at 4 percent. All alloys have weight fractions of Pt of at least 85.0 percent. The critical rod diameters of the example alloys along with the Pt weight percentage are also listed in Table 18.
(137) TABLE-US-00018 TABLE 18 Sample metallic glasses demonstrating the effect of varying the P and Si atomic concentrations according to the formula Pt.sub.63.5Pd.sub.9.5Ag.sub.4P.sub.23xSi.sub.x on the glass-forming ability of the alloys Critical Rod Example Composition Pt wt. % Diameter [mm] 30 Pt.sub.63.5Pd.sub.9.5Ag.sub.4P.sub.23 85.2 4 63 Pt.sub.63.5Pd.sub.9.5Ag.sub.4P.sub.20Si.sub.3 85.2 8 64 Pt.sub.63.5Pd.sub.9.5Ag.sub.4P.sub.18.5Si.sub.4.5 85.3 13 65 Pt.sub.63.5Pd.sub.9.5Ag.sub.4P.sub.18Si.sub.5 85.3 12 66 Pt.sub.63.5Pd.sub.9.5Ag.sub.4P.sub.16Si.sub.7 85.3 7 67 Pt.sub.63.5Pd.sub.9.5Ag.sub.4Pi.sub.14Si.sub.9 85.3 4 68 Pt.sub.63.5Pd.sub.9.5Ag.sub.4Pi.sub.12Si.sub.11 85.4 3 69 Pt.sub.63.5Pd.sub.9.5Ag.sub.4Pi.sub.10Si.sub.13 85.4 2 70 Pt.sub.63.5Pd.sub.9.5Ag.sub.4P.sub.8Si.sub.15 85.4 1
(138) As shown in Table 18 and
(139)
(140) TABLE-US-00019 TABLE 19 Sample metallic glasses demonstrating the effect of varying the atomic fractions of Ni and Ag according to the formula Pt.sub.63.5Pd.sub.9.5Ag.sub.4P.sub.23xSi.sub.x on the glass-transition, crystallization, solidus, and liquidus temperatures of the alloys T.sub.g T.sub.x T.sub.x T.sub.s T.sub.l Example Composition ( C.) ( C.) (K) ( C.) ( C.) 30 Pt.sub.63.5Pd.sub.9.5Ag.sub.4P.sub.23 221.5 281.8 60.3 523.6 594.0 63 Pt.sub.63.5Pd.sub.9.5Ag.sub.4P.sub.20Si.sub.3 232.2 303.6 71.4 532.8 589.4 64 Pt.sub.63.5Pd.sub.9.5Ag.sub.4P.sub.18.5Si.sub.4.5 236.0 302.3 66.3 524.9 603.0 66 Pt.sub.63.5Pd.sub.9.5Ag.sub.4P.sub.16Si.sub.7 252.9 302.3 49.4 558.4 701.8 67 Pt.sub.63.5Pd.sub.9.5Ag.sub.4P.sub.14Si.sub.9 259.0 302.5 43.5 548.0 745.9 68 Pt.sub.63.5Pd.sub.9.5Ag.sub.4P.sub.12Si.sub.11 270.5 305.4 34.9 543.1 765.8 69 Pt.sub.63.5Pd.sub.9.5Ag.sub.4P.sub.10Si.sub.13 279.1 309.7 30.6 561.3 783.2
(141) Other metallic glasses according to embodiments of the disclosure with Pt weight fraction of at least 85.0 percent satisfying the PT850 hallmark are presented in Table 20. The critical rod diameters of the example alloys along with the Pt weight percentage are also listed in Table 20.
(142) TABLE-US-00020 TABLE 20 Other metallic glasses according to embodiments of the disclosure Critical Rod Example Composition Pt wt. % Diameter [mm] 70 Pt.sub.63.5Pd.sub.10Ag.sub.4P.sub.18Si.sub.4.5 85.0 12 71 Pt.sub.63Pd.sub.9Ag.sub.4P.sub.18.5Si.sub.4.5 85.7 12 72 Pt.sub.63.25Pd.sub.9.5Ag.sub.4.25P.sub.18.5Si.sub.4.5 85.1 13 73 Pt.sub.63.25Pd.sub.9.25Ag.sub.4.5P.sub.18.5Si.sub.4.5 85.0 12 74 Pt.sub.63.25Pd.sub.9.5Ag.sub.4.25P.sub.18.75Si.sub.4.25 85.0 12 75 Pt.sub.63.25Pd.sub.9.5Ag.sub.4.25P.sub.18.25Si.sub.4.75 85.1 12
(143) As shown in Tables 18 and 20, alloys Pt.sub.63.5Pd.sub.9.5Ag.sub.4P.sub.18.5Si.sub.4.5 (Example 64) and Pt.sub.63.25Pd.sub.9.5Ag.sub.4.25P.sub.18.5Si.sub.4.5 (Example 72) have the highest glass-forming ability among PtPdAgPSi alloys that satisfy the PT850 hallmark, demonstrating a critical rod diameter of 13 mm.
(144) Description of Methods of Processing the Ingots of the Sample Alloys
(145) A method for producing the alloy ingots involves inductive melting of the appropriate amounts of elemental constituents in a quartz tube under inert atmosphere. The purity levels of the constituent elements were as follows: Pt 99.99%, Pd 99.95%, Au 99.99%, Ag 99.95%, Ni 99.995%, P 99.9999%, and Si 99.9999%. The melting crucible may alternatively be a ceramic such as alumina or zirconia, graphite, sintered crystalline silica, or a water-cooled hearth made of copper or silver. In some embodiments, P can be incorporated in the alloy as a pre-alloyed compound formed with at least one of the other elements, like for example, as a PtP or a NiP compound.
(146) Description of Methods of Processing the Sample Metallic Glasses
(147) A particular method for producing metallic glass rods from the alloy ingots for the sample alloys involves re-melting the alloy ingots in quartz tubes having 0.5 mm thick walls in a furnace at 850 C. under high purity argon and rapidly quenching in a room-temperature water bath. In some embodiments, the melt temperature prior to quenching is between 700 and 1200 C., while in other embodiments it is between 700 and 950 C., and yet in other embodiments between 700 and 800 C. In some embodiments, the bath could be ice water or oil. In other embodiments, metallic glass articles can be formed by injecting or pouring the molten alloy into a metal mold. In some embodiments, the mold can be made of copper, brass, or steel, among other materials.
(148) Description of Methods of Fluxing the Ingots of the Sample Alloys
(149) Optionally, prior to producing a metallic glass article, the alloyed ingots may be fluxed with a reducing agent. In one embodiment, the reducing agent can be dehydrated boron oxide (B.sub.2O.sub.3). A particular method for fluxing the alloys of the disclosure involves melting the ingots and B.sub.2O.sub.3 in a quartz tube under inert atmosphere at a temperature in the range of 750 and 900 C., bringing the alloy melt in contact with the B.sub.2O.sub.3 melt and allowing the two melts to interact for about 1000 s, and subsequently quenching in a bath of room temperature water. In some embodiments, the melt and B.sub.2O.sub.3 are allowed to interact for at least 500 seconds prior to quenching, and in some embodiments for at least 2000 seconds. In some embodiments, the melt and B.sub.2O.sub.3 are allowed to interact at a temperature of at least 700 C., and in other embodiments between 800 and 1200 C. In yet other embodiments, the step of producing the metallic glass rod may be performed simultaneously with the fluxing step, where the water-quenched sample at the completion of the fluxing step represents the metallic glass rod.
(150) Description of Methods of Processing the PtNiPdP Sample Metallic Glasses
(151) A particular method for producing PtNiPdP metallic glass rods from the alloy ingots for the sample alloys involves melting the ingots and B.sub.2O.sub.3 in a quartz tube under inert atmosphere, bringing the alloy melt in contact with the B.sub.2O.sub.3 melt and allowing the two melts to interact at 900 C. for about 1000 s, and subsequently quenching in a bath of room temperature water.
(152) Test Methodology for Assessing Glass-Forming Ability by Tube Quenching
(153) The glass-forming ability of the alloys were assessed by determining the maximum rod diameter in which the amorphous phase of the alloy (i.e. the metallic glass phase) could be formed when processed by the method of water-quenching a quartz tube containing the alloy melt, as described above. X-ray diffraction with Cu-K radiation was performed to verify the amorphous structure of the quenched rods.
(154) Test Methodology for Differential Scanning calorimetry
(155) Differential scanning calorimetry was performed on sample metallic glasses at a scan rate of 20 K/min to determine the glass-transition, crystallization, solidus, and liquidus temperatures of sample metallic glasses.
(156) Test Methodology for Measuring Hardness
(157) The Vickers hardness (HV0.5) of sample metallic glasses was measured using a Vickers microhardness tester. Eight tests were performed where micro-indentions were inserted on a flat and polished cross section of a 3 mm metallic glass rod using a load of 500 g and a duel time of 10 s.
(158) The alloys and metallic glasses described herein can be valuable in the fabrication of electronic devices. An electronic device herein can refer to any electronic device known in the art. For example, it can be a telephone, such as a mobile phone, and a landline phone, or any communication device, such as a smart phone, including, for example an iPhone, and an electronic email sending/receiving device. It can be a part of a display, such as a digital display, a TV monitor, an electronic-book reader, a portable web-browser (e.g., iPad), and a computer monitor. It can also be an entertainment device, including a portable DVD player, conventional DVD player, Blue-Ray disk player, video game console, music player, such as a portable music player (e.g., iPod), etc. It can also be a part of a device that provides control, such as controlling the streaming of images, videos, sounds (e.g., Apple TV), or it can be a remote control for an electronic device. It can be a part of a computer or its accessories, such as the hard drive tower housing or casing, laptop housing, laptop keyboard, laptop track pad, desktop keyboard, mouse, and speaker. The article can also be applied to a device such as a watch or a clock.
(159) Having described several embodiments, it will be recognized by those skilled in the art that various modifications, alternative constructions, and equivalents may be used without departing from the spirit of the invention. Additionally, a number of well-known processes and elements have not been described in order to avoid unnecessarily obscuring the present invention. Accordingly, the above description should not be taken as limiting the scope of the invention.
(160) Those skilled in the art will appreciate that the presently disclosed embodiments teach by way of example and not by limitation. Therefore, the matter contained in the above description or shown in the accompanying drawings should be interpreted as illustrative and not in a limiting sense. The following claims are intended to cover all generic and specific features described herein, as well as all statements of the scope of the present method and system, which, as a matter of language, might be said to fall therebetween.