NOVEL HIGH-ENTROPY ALLOY COMPOSITIONS

Abstract

Novel high-entropy alloy (HEA) compositions are particularly suited to welding applications. The mixtures contain at least the elements nickel, manganese, cobalt, chromium, vanadium, molybdenum, and iron. The % weight of the constituents varies in accordance with the detailed description contained herein, with tolerances in the range of +/2% and, in some cases, +/1%. The mixture may also contain a small amount of aluminum with a tolerance in the range of +/1% or, more preferably, +/0.5% In accordance with the invention, the compositions above may be integrated into HEA welding products using cored wire and welding electrode manufacturing techniques, preferably starting with vacuum melted rolled alloys. One manufacturing process uses the compositions as an alloyed strip formed around the appropriate ground/crushed alloys to make commercially viable fabricated welding products.

Claims

1. A high-entropy alloy for welding applications, comprising: a mixture containing at least the following elements: nickel, manganese, cobalt, chromium, vanadium, molybdenum, and iron.

2. The high-entropy alloy of claim 1, including the following amounts of the elements by percent weight, each with a tolerance in the range of +/2%: TABLE-US-00002 5.12% nickel, 9.58% manganese, 15.42% cobalt, 13.61% chromium, 8.88% vanadium, 8.38% molybdenum, and 39.02% iron.

3. The high-entropy alloy of claim 1, including the following amounts of the elements by percent weight, each with a tolerance in the range of +/2%: TABLE-US-00003 4.95% nickel, 9.26% manganese, 19.88% cobalt, 17.55% chromium, 8.59% vanadium, 16.20% molybdenum, and 23.58% iron.

4. The high-entropy alloy of claim 1, including the following amounts of the elements by percent weight, each with a tolerance in the range of +/2%: TABLE-US-00004 4.98% nickel, 9.31% manganese, 24.97% cobalt, 22.04% chromium, 12.95% vanadium, 16.28% molybdenum, and 9.48% iron.

5. The high-entropy alloy of claim 1, including the following amounts of the elements by percent weight, each with a tolerance in the range of +/2%: TABLE-US-00005 9.95% nickel, 9.30% manganese, 14.97% cobalt, 17.62% chromium, 12.94% vanadium, 16.27% molybdenum, and 18.95% iron.

6. The high-entropy alloy of claim 1, further including 0.11 to 0.12% aluminum with a tolerance in the range of +/05%:

7. The high-entropy alloy of claim 6, including the following amounts of elements by percent weight, each with a tolerance in the range of +/2%: TABLE-US-00006 10.29% nickel, 9.62% manganese, 20.64% cobalt, 22.78% chromium, 8.92% vanadium, 8.41% molybdenum, and 19.35% iron.

8. The high-entropy alloy of claim 6, including the following amounts of elements by percent weight, each with a tolerance in the range of +/2%: TABLE-US-00007 9.85% nickel, 9.21% manganese, 24.70% cobalt, 13.08% chromium, 8.54% vanadium, 16.10% molybdenum, and 18.52% iron.

9. The high-entropy alloy of claim 6, including the following amounts of elements by percent weight, each with a tolerance in the range of +/2%: TABLE-US-00008 14.91% nickel, 9.29% manganese, 14.96% cobalt, 22.01% chromium, 8.62% vanadium, 16.25% molybdenum, and 13.96% iron.

10. The high-entropy alloy of claim 6, including the following amounts of elements by percent weight, each with a tolerance in the range of +/2%: TABLE-US-00009 14.83% nickel, 9.25% manganese, 19.85% cobalt, 13.14% chromium, 12.86% vanadium, 16.17% molybdenum, and 13.89% iron.

11. The high-entropy alloy of claim 6, including the following amounts of elements by percent weight, each with a tolerance in the range of +/2%: TABLE-US-00010 15.30% nickel, 9.54% manganese, 25.58% cobalt, 18.07% chromium, 8.84% vanadium, 8.34% molybdenum, and 14.33% iron.

12. The high-entropy alloy of claim 1, wherein the welding product is fabricated using a cored-wire manufacturing process.

13. The high-entropy alloy of claim 12, wherein the cored-wire manufacturing process comprises an alloyed strip formed around the high-entropy alloy in ground or crushed form.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0009] In broad and general terms, this invention resides in various HEA alloy compositions specifically for welding applications. Table I, below, lists nine alloy compositions applicable to the invention. Note that the tolerance is preferably set at +/2.0%, more preferably +/1.0%.

[0010] To determine optimum compositions for different applications, we measure room temperature and elevated temperature hardness and tensile properties. This allows us to determine the best combinations for (1) high temperature strength and room temperature ductility for forging an die casting applications; (2) room temperature strength and ductility for structural applications; (3) high temperature strength and creep resistance for engine applications; and possibly (4) elevated temperature strength and corrosion resistance for gas and oil applications.

TABLE-US-00001 TABLE I HIGH-ENTROPY ALLOYS FOR WELDING APPLICATIONS Alloy# Element Ni Mn Co Cr V Mo Al Fe 1 Wt % 5.12% 9.58% 15.42% 13.61% 8.88% 8.38% 0.00% 39.02% 2 Wt % 4.95% 9.26% 19.88% 17.55% 8.59% 16.20% 0.00% 23.58% 3 Wt % 4.98% 9.31% 24.97% 22.04% 12.95% 16.28% 0.00% 9.48% 4 Wt % 9.95% 9.30% 14.97% 17.62% 12.94% 16.27% 0.00% 18.95% 5 Wt % 10.29% 9.62% 20.64% 22.78% 8.92% 8.41% 0.12% 19.35% 6 Wt % 9.85% 9.21% 24.70% 13.08% 8.54% 16.10% 0.11% 18.52% 7 Wt % 14.91% 9.29% 14.96% 22.01% 8.62% 16.25% 0.11% 13.96% 8 Wt % 14.83% 9.25% 19.85% 13.14% 12.86% 16.17% 0.11% 13.89% 9 Wt % 15.30% 9.54% 25.58% 18.07% 8.84% 8.34% 0.12% 14.33% Tolerance Wt % .sup.1% .sup.1% .sup.2% .sup.2% .sup.1% .sup.1% 0.05% .sup.2%

[0011] In accordance with the invention, the embodiments above are integrated into HEA welding products using cored wire and welding electrode manufacturing techniques, preferably starting with vacuum melted rolled alloys. One manufacturing process uses the compositions as an alloyed strip formed around the appropriate ground/crushed alloys to make commercially viable fabricated welding products.