REFINED GOSS-GRAIN ALUMINUM ALLOY PLATE AND PREPARATION METHOD THEREOF

Abstract

Provided is a refined Goss-grain aluminum alloy plate and a preparation method thereof. The refined Goss-grain aluminum alloy plate includes the following compositions: 3.7-4.8 wt % of Cu, 1.2-1.7 wt % of Mg, 0.3-0.8 wt % of Mn, 0.03-0.10 wt % of Ti, and the balance of Al. The refined Goss-grain aluminum alloy plate is prepared by a method including subjecting an AlCuMg alloy ingot with a certain composition to a homogenizing at a temperature of 470-505 C., a hot rolling at high temperature of 465-495 C. with a large deformation of 80%-98% and a high final temperature, then directly to a cold rolling with a small or medium deformation of 5% to 50%, and then to a recrystallization and annealing treatment at a temperature of 300-450 C., a solid solution treatment at a temperature of 460-505 C., and a natural aging treatment for at least 96 hours.

Claims

1. A refined Goss-grain aluminum alloy plate, comprising the following compositions: 3.7-4.8 wt % of Cu, 1.2-1.7 wt % of Mg, 0.3-0.8 wt % of Mn, 0.03-0.10 wt % of Ti, and a balance of Al, wherein the refined Goss-grain aluminum alloy plate has a Goss texture intensity of not less than 3.9; and the refined Goss-grain aluminum alloy plate is prepared by a method comprising: subjecting an AlCuMg alloy ingot to a homogenizing, a hot rolling at high temperature with a large deformation and a high final temperature, then directly to a cold rolling with a small or medium deformation, and then to a recrystallization and annealing treatment, a solid solution treatment, a water quenching, and a natural aging treatment, wherein, the homogenizing is performed at a temperature of 470-505 C. for 24-96 hours; the hot rolling at high temperature with a large deformation and a high final temperature is performed at a temperature of 465-495 C., with a rolling deformation of 80%-98% and a final temperature of not less than 380 C.; the cold rolling with a small or medium deformation is performed directly after the hot rolling under a rolling deformation of a single-pass and a multi-pass cold rolling of 5% to 50%; the recrystallization and annealing treatment is performed at a temperature of 300-450 C. for 60-300 minutes; the solid solution treatment is performed at a temperature of 460-505 C. for 5-90 minutes, and quenched with water; the natural aging treatment is performed at ambient temperature for at least 96 hours; and the refined Goss-grain aluminum alloy plate has a Goss grain size of less than 100 m.

2. The refined Goss-grain aluminum alloy plate of claim 1, wherein the refined Goss-grain aluminum alloy plate has a Goss grain size of not more than 20 m.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG. 1 shows the orientation distribution function (ODF) sections of the hot-rolled alloy plate as prepared in example 4.

[0025] FIG. 2 shows the optical microstructure of the hot-rolled alloy plate as prepared in example 4.

[0026] FIG. 3 shows the ODF sections of the hot-rolled alloy plate as prepared in comparative example 1.

[0027] FIG. 4 shows the optical microstructure of the hot-rolled alloy plate as prepared in comparative example 1.

[0028] FIG. 5 shows the ODF sections of the cold-rolled alloy plate as prepared in example 2;

[0029] FIG. 6 shows the optical microstructure of the cold-rolled alloy plate as prepared in example 2.

[0030] FIG. 7 shows the ODF sections of the cold-rolled alloy plate as prepared in example 5.

[0031] FIG. 8 shows the optical microstructure of the cold-rolled alloy plate as prepared in example 5.

[0032] FIG. 9 shows the ODF sections of the cold-rolled alloy plate as prepared in comparative example 1.

[0033] FIG. 10 shows the optical microstructure of the cold-rolled alloy plate as prepared in comparative example 1.

[0034] FIG. 11 shows the ODF sections of the cold-rolled alloy plate as prepared in comparative example 3.

[0035] FIG. 12 shows the optical microstructure of the cold-rolled alloy plate as prepared in comparative example 3.

[0036] FIG. 13 shows the ODF sections of the aged alloy plate as prepared in example 1.

[0037] FIG. 14A shows the optical microstructure of the aged alloy plate as prepared in example 1.

[0038] FIG. 14B shows the grain size distribution of the aged alloy plate as prepared in example 1.

[0039] FIG. 15 shows the ODF sections of the aged alloy plate as prepared in example 2.

[0040] FIG. 16A shows the optical microstructure of the aged alloy plate as prepared in example 2.

[0041] FIG. 16B shows the grain size distribution of the aged alloy plate as prepared in example 2.

[0042] FIG. 17 shows the ODF sections of the aged alloy plate as prepared in example 3.

[0043] FIG. 18A shows the optical microstructure of the aged alloy plate as prepared in example 3.

[0044] FIG. 18B shows the grain size distribution of the aged alloy plate as prepared in example 3.

[0045] FIG. 19 shows the ODF sections of the aged alloy plate as prepared in example 4.

[0046] FIG. 20A shows the optical microstructure of the aged alloy plate as prepared in example 4.

[0047] FIG. 20B shows the grain size distribution of the aged alloy plate as prepared in example 4.

[0048] FIG. 21 shows the ODF sections of the aged alloy plate as prepared in example 5.

[0049] FIG. 22A shows the optical microstructure of the aged alloy plate as prepared in example 5.

[0050] FIG. 22B shows the grain size distribution of the aged alloy plate as prepared in example 5.

[0051] FIG. 23 shows the ODF sections of the aged alloy plate as prepared in example 6.

[0052] FIG. 24A shows the optical microstructure of the aged alloy plate as prepared in example 6.

[0053] FIG. 24B shows the grain size distribution of the aged alloy plate as prepared in example 6.

[0054] FIG. 25 shows the ODF sections of the aged alloy plate as prepared in example 7.

[0055] FIG. 26A shows the optical microstructure of the aged alloy plate as prepared in example 7.

[0056] FIG. 26B shows the grain size distribution of the aged alloy plate as prepared in example 7.

[0057] FIG. 27 shows the ODF sections of the annealed alloy plate as prepared in example 8.

[0058] FIG. 28 shows the ODF sections of the annealed alloy plate as prepared in comparative example 1.

[0059] FIG. 29 shows the ODF sections of the annealed alloy plate as prepared in comparative example 2.

[0060] FIG. 30 shows the ODF sections of the annealed alloy plate as prepared in comparative example 3.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0061] In order to make the objects, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below with reference to the examples. It should be understood that the specific examples described herein are only used to explain the present disclosure, but not to limit the present disclosure.

Example 1

[0062] An alloy in this example was provided with the following compositions: 4.3% of Cu, 1.3% of Mg, 0.6% of Mn, 0.09% of Ti, and the balance of Al.

[0063] The alloy was subjected to a homogenizing at 480 C. for 48 hours, and then to a hot rolling at 470 C. with a deformation of 83% and a final rolling temperature of not less than 380 C. to obtain a hot-rolled alloy plate. The hot-rolled alloy plate was then subjected to a cold rolling with a deformation of 5% to obtain a cold-rolled alloy plate. The cold-rolled alloy plate was subjected to a recrystallization and annealing treatment at 360 C. for 240 minutes, a solid solution treatment at 460 C. for 90 minutes, a water quenching, and a natural aging treatment for at least 96 hours to obtain an aged alloy plate with a Goss texture intensity of 7.03 and a Goss grain size of 45.14 m.

Example 2

[0064] An alloy in this example was provided with the following compositions: 3.7% of Cu, 1.2% of Mg, 0.7% of Mn, 0.06% of Ti, and the balance of Al.

[0065] The alloy was subjected to a homogenizing at 485 C. for 24 hours, and then to a hot rolling at 480 C. with a deformation of 88% and a final rolling temperature of not less than 380 C. to obtain a hot-rolled alloy plate. The hot-rolled alloy plate was then subjected to a cold rolling with a deformation of 13% to obtain a cold-rolled alloy plate. The cold-rolled alloy plate was subjected to a recrystallization and annealing treatment at 390 C. for 120 minutes, a solid solution treatment at 465 C. for 30 minutes, a water quenching, and a natural aging treatment for at least 96 hours to obtain an aged alloy plate with a Goss texture intensity of 8.35 and a Goss grain size of 39.81 m.

Example 3

[0066] An alloy in this example was provided with the following compositions: 3.8% of Cu, 1.6% of Mg, 0.4% of Mn, 0.06% of Ti, and the balance of Al.

[0067] The alloy was subjected to a homogenizing at 495 C. for 72 hours, and then to a hot rolling at 485 C. with a deformation of 90% and a final rolling temperature of not less than 380 C. to obtain a hot-rolled alloy plate. The hot-rolled alloy plate was then subjected to a cold rolling with a deformation of 20% to obtain a cold-rolled alloy plate. The cold-rolled alloy plate was subjected to a recrystallization and annealing treatment at 450 C. for 60 minutes, a solid solution treatment at 480 C. for 90 minutes, a water quenching, and a natural aging treatment for at least 96 hours to obtain an aged alloy plate with a Goss texture intensity of 10.17 and a Goss grain size of 35.16 m.

Example 4

[0068] An alloy in this example was provided with the following compositions: 4.1% of Cu, 1.3% of Mg, 0.6% of Mn, 0.03% of Ti, and the balance of Al.

[0069] The alloy was subjected to a homogenizing at 500 C. for 96 hours, and then to a hot rolling at 490 C. with a deformation of 95% and a final rolling temperature of not less than 380 C. to obtain a hot-rolled alloy plate. The hot-rolled alloy plate was then subjected to a cold rolling with a deformation of 26% to obtain a cold-rolled alloy plate. The cold-rolled alloy plate was subjected to a recrystallization and annealing treatment at 360 C. for 60 minutes, a solid solution treatment at 490 C. for 20 minutes, a water quenching, and a natural aging treatment for at least 96 hours to obtain an aged alloy plate with a Goss texture intensity of 10.20 and a Goss grain size of 23.44 m.

Example 5

[0070] An alloy in this example was provided with the following compositions: 4.7% of Cu, 1.3% of Mg, 0.4% of Mn, 0.09% of Ti, and the balance of Al.

[0071] The alloy was subjected to a homogenizing at 505 C. for 72 hours, and then to a hot rolling at 495 C. with a deformation of 98% and a final rolling temperature of not less than 380 C. to obtain a hot-rolled alloy plate. The hot-rolled alloy plate was then subjected to a cold rolling with a deformation of 32% to obtain an cold-rolled alloy plate. The cold-rolled alloy plate was subjected to a recrystallization and annealing treatment at 300 C. for 300 minutes, a solid solution treatment at 505 C. for 30 minutes, a water quenching, and a natural aging treatment for at least 96 hours to obtain an aged alloy plate with a Goss texture intensity of 11.10 and a Goss grain size of 62.42 m.

Example 6

[0072] An alloy in this example was provided with the following compositions: 4.1% of Cu, 1.6% of Mg, 0.3% of Mn, 0.03% of Ti, and the balance of Al.

[0073] The alloy was subjected to a homogenizing at 475 C. for 24 hours, and then to a hot rolling at 470 C. with a deformation of 86% and a final rolling temperature of not less than 380 C. to obtain a hot-rolled alloy plate. The hot-rolled alloy plate was then subjected to a cold rolling with a deformation of 35% to obtain a cold-rolled alloy plate. The cold-rolled alloy plate was subjected to a recrystallization and annealing treatment at 340 C. for 240 minutes, a solid solution treatment at 465 C. for 5 minutes, a water quenching, and a natural aging treatment for at least 96 hours to obtain an aged alloy plate with a Goss texture intensity of 7.44 and a Goss grain size of 37.42 m.

Example 7

[0074] An alloy in this example was provided with the following compositions: 4.7% of Cu, 1.3% of Mg, 0.6% of Mn, 0.06% of Ti, and the balance of Al.

[0075] The alloy was subjected to a homogenizing at 505 C. for 24 hours, and then to a hot rolling at 465 C. with a deformation of 83% and a final rolling temperature of not less than 380 C. to obtain a hot-rolled alloy plate. The hot-rolled alloy plate was then subjected to a cold rolling with a deformation of 39% to obtain a cold-rolled alloy plate. The cold-rolled alloy plate was subjected to a recrystallization and annealing treatment at 420 C. for 120 minutes, a solid solution treatment at 505 C. for 20 minutes, a water quenching, and a natural aging treatment for at least 96 hours to obtain an aged alloy plate with a Goss texture intensity of 4.95 and a Goss grain size of 19.04 m.

Example 8

[0076] An alloy in this example was provided with the following compositions: 3.7% of Cu, 1.2% of Mg, 0.8% of Mn, 0.10% of Ti, and the balance of Al.

[0077] The alloy was subjected to a homogenizing at 470 C. for 96 hours, and then to a hot rolling at 465 C. with a deformation of 98% and a final rolling temperature of not less than 380 C. to obtain a hot-rolled alloy plate. The hot-rolled alloy plate was then subjected to a cold rolling with a deformation of 16% to obtain a cold-rolled alloy plate. The cold-rolled alloy plate was subjected to a recrystallization and annealing treatment at 450 C. for 180 minutes, and a natural aging treatment for at least 96 hours to obtain an annealed alloy plate with a Goss texture intensity of 8.73.

Comparative Example 1

[0078] An alloy in this comparative example was provided with the following compositions: 4.7% of Cu, 1.6% of Mg, 0.4% of Mn, 0.10% of Ti, and the balance of Al.

[0079] The alloy was subjected to a homogenizing at 480 C. for 36 hours, and then subjected to a hot rolling at 475 C. with a deformation of 80% and a final rolling temperature of not less than 380 C. to obtain a hot-rolled alloy plate. The hot-rolled alloy plate was then subjected to a cold rolling with a deformation of 50% to obtain a cold-rolled alloy plate. The cold-rolled alloy plate was subjected to a recrystallization and annealing treatment at 300 C. for 240 minutes, and a natural aging treatment for at least 96 hours to obtain an annealed alloy plate with a Goss texture intensity of 3.99.

Comparative Example 2

[0080] An alloy in this comparative example was provided with the following compositions: 3.7% of Cu, 1.4% of Mg, 0.3% of Mn, 0.04% of Ti, and the balance of Al.

[0081] The alloy was subjected to a homogenizing at 470 C. for 24 hours, and then to a hot rolling at 465 C. with a deformation of 78% to obtain a hot-rolled alloy plate. The hot-rolled alloy plate was then subjected to a cold rolling with a deformation of 55% to obtain a cold-rolled alloy plate. The cold-rolled alloy plate was subjected to a recrystallization and annealing treatment at 420 C. for 180 minutes, and a natural aging treatment for at least 96 hours to obtain an annealed alloy plate with a Goss texture intensity of 2.77.

Comparative Example 3

[0082] An alloy in this comparative example was provided with the following compositions: 4.5% of Cu, 1.2% of Mg, 0.5% of Mn, 0.05% of Ti, and the balance of Al.

[0083] The alloy was subjected to a homogenizing at 470 C. for 96 hours, and then to a hot rolling at 465 C. with a deformation of 80% to obtain a hot-rolled alloy plate. The hot-rolled alloy plate was then subjected to a cold rolling with a deformation of 52% to obtain a cold-rolled alloy plate. The cold-rolled alloy plate was subjected to a recrystallization and annealing treatment at 360 C. for 60 minutes, and a natural aging treatment for at least 96 hours to obtain an annealed alloy plate with a Goss texture intensity of 3.15.

[0084] With reference to FIGS. 1-30, it can be seen that:

[0085] In example 1, the aged alloy plate prepared by a method comprising a homogenizing (at 480 C. for 48 hours), a hot rolling (at 470 C. with a deformation of 83%), a cold rolling (with a deformation of 5%), a recrystallization and annealing treatment (at 360 C. for 240 minutes), a solid solution treatment (at 460 C. for 90 minutes), and a natural aging treatment (for at least 96 hours) has an average grain size of 45.14 m and a Goss texture intensity of 7.03.

[0086] In example 2, the aged alloy plate prepared by a method comprising a homogenizing (at 485 C. for 24 hours), a hot rolling (at 480 C. with a deformation of 88%), a cold rolling (with a deformation of 13%), a recrystallization and annealing treatment (at 390 C. for 120 minutes), a solid solution treatment (at 465 C. for 30 minutes), and a natural aging treatment (for at least 96 hours) has an average grain size of 39.81 m and a Goss texture intensity of 8.35.

[0087] In example 3, the aged alloy plate prepared by a method comprising a homogenizing (at 495 C. for 72 hours), a hot rolling (at 485 C. with a deformation of 90%), a cold rolling (with a deformation of 20%), a recrystallization and annealing treatment (at 450 C. for 60 minutes), a solid solution treatment (at 480 C. for 90 minutes), and a natural aging treatment (for at least 96 hours) has an average grain size of 35.16 m and a Goss texture intensity of 10.17.

[0088] In example 4, the aged alloy plate prepared by a method comprising a homogenizing (at 500 C. for 96 hours), a hot rolling (at 490 C. with a deformation of 95%), a cold rolling (with a deformation of 26%), a recrystallization and annealing treatment (at 360 C. for 60 minutes), a solid solution treatment (at 490 C. for 20 minutes), and a natural aging treatment (for at least 96 hours) has an average grain size of 23.44 m and a Goss texture intensity of 10.20.

[0089] In example 5, the aged alloy plate prepared by a method comprising a homogenizing (at 505 C. for 72 hours), a hot rolling (at 495 C. with a deformation of 98%), a cold rolling (with a deformation of 32%), a recrystallization and annealing treatment (at 300 C. for 300 minutes), a solid solution treatment (at 505 C. for 30 minutes), and a natural aging treatment (for at least 96 hours) has an average grain size of 62.42 m and a Goss texture intensity of 11.10.

[0090] In example 6, the aged alloy plate prepared by a method consisting of a homogenizing (at 475 C. for 24 hours), a hot rolling (at 470 C. with a deformation of 86%), a cold rolling (with a deformation of 35%), a recrystallization and annealing treatment (at 340 C. for 240 minutes), a solid solution treatment (at 465 C. for 5 minutes), and a natural aging treatment (for at least 96 hours) has an average grain size of 37.42 m and a Goss texture intensity of 7.44.

[0091] In example 7, the aged alloy plate prepared by a method consisting of a homogenizing (at 505 C. for 24 hours), a hot rolling (at 465 C. with a deformation of 83%), a cold rolling (with a deformation of 39%), a recrystallization and annealing treatment (at 420 C. for 120 minutes), a solid solution treatment (at 505 C. for 20 minutes), and a natural aging treatment (for at least 96 hours) has an average grain size of 19.04 m and a Goss texture intensity of 4.95.

[0092] In example 8, the aged alloy plate prepared by a method consisting of a homogenizing (at 470 C. for 96 hours), a hot rolling (at 465 C. with a deformation of 98%), a cold rolling (with a deformation of 16%), a recrystallization and annealing treatment (at 450 C. for 180 minutes), and a natural aging treatment (for at least 96 hours) has a Goss texture intensity of 8.73.

[0093] In comparative example 1, the aged alloy plate prepared by a method consisting of a homogenizing (at 480 C. for 36 hours), a hot rolling (at 475 C. with a deformation of 80%), a cold rolling (with a deformation of 50%), a recrystallization and annealing treatment (at 300 C. for 240 minutes), and a natural aging treatment (for at least 96 hours) has a Goss texture intensity of 3.99.

[0094] In comparative example 2, the aged alloy plate prepared by a method consisting of a homogenizing (at 470 C. for 24 hours), a hot rolling (at 465 C. with a deformation of 78%), a cold rolling (with a deformation of 55%), a recrystallization and annealing treatment (at 420 C. for 180 minutes), and a natural aging treatment (for at least 96 hours) has a Goss texture intensity of 2.77.

[0095] In comparative example 3, the aged alloy plate prepared by a method consisting of a homogenizing (at 470 C. for 96 hours), a hot rolling (at 465 C. with a deformation of 80%), a cold rolling (with a deformation of 52%), a recrystallization and annealing treatment (at 360 C. for 60 minutes), and a natural aging treatment (for at least 96 hours) has a Goss texture intensity of 3.15.

[0096] With reference to FIGS. 1-12, it can be seen that after the hot rolling at high temperature with a large deformation and a high final rolling temperature, a strong Brass texture was formed in the aluminum alloy plate. A cold rolling with a controlled deformation (5-50%) that was then carried out directly after the hot rolling makes it possible to obtain a cold-rolled plate that does not significantly reduce the Brass texture of the hot-rolled plate. Under the condition that the deformation of the cold rolling exceeds the controlled deformation (>50%), the Brass texture of the hot-rolled plate presents a random evolution trend, which is not conducive to the subsequent recrystallization and annealing treatment and solid solution treatment to obtain a cold-rolled Goss aluminum alloy plate with high Goss texture intensity.

[0097] It can be seen from the ODF diagrams in FIGS. 1-30 that under the condition that the hot-rolled plate is directly subjected to a cold rolling within a controlled deformation (5-50%), and then the obtained cold-rolled plate is subjected to a recrystallization and annealing treatment and a solid solution, it is possible to obtain a cold-rolled refined Goss-grain aluminum alloy plate with high Goss texture intensity. However, under the condition that the hot-rolled plate is directly subjected to a cold rolling beyond the controlled deformation (>50%), the Goss texture with high intensity could not be obtained in the subsequent annealing treatment due to the randomization of the Brass texture of the cold rolled plate.

[0098] With reference to the diagrams of the metallographic structure in FIGS. 1-30, it can be seen that the cold rolling with a large deformation would help to refine the Goss grain size of the alloy. Under the condition that the cold rolling is performed with a large deformation, the grain-refined Goss aluminum alloy plate could be prepared by the recrystallization and annealing treatment at a lower temperature. Under the condition that the cold rolling is performed with a small deformation, the refined Goss-grain aluminum alloy plate could also be prepared by appropriately increasing the temperature of the recrystallization and annealing treatment. A grain-refined Goss plate with a small grain size and a high Goss texture intensity could be prepared by a cold rolling with moderate deformation, a recrystallization and annealing treatment with a high temperature, a solid solution treatment, and a natural aging treatment.

[0099] In the present disclosure, the hot-rolled plate obtained by the hot rolling at high temperature with a large deformation and a high final rolling temperature is directly subjected to a cold rolling with a controlled deformation (5-50%) such that the Brass texture of the hot rolled plate is not significantly reduced. In this way, the increased deformation stored energy in the plate makes it possible to not only obtain a Goss texture with high intensity, but also significantly refine the grains in the subsequent recrystallization and annealing treatment and solid solution treatment. Thus, a refined Goss-grain aluminum alloy plate with high intensity is finally obtained.

[0100] In the present disclosure, the Goss grains could be significantly refined while obtaining a Goss texture with high intensity, and the fatigue resistance of the Goss textured aluminum alloy plate could be further improved.

[0101] In the present disclosure, the method is simple, and a cold-rolled aluminum alloy plate with a Goss grain size of less than 20 m could be obtained, and is suitable for large-scale industrial production and application.

[0102] The above is not intended to limit the present disclosure in any form. Although the present disclosure has been described through the above-mentioned examples, these examples are not intended to limit the present disclosure. Any changes or modifications based on the technical concepts disclosed herein made by those skilled in the art, without departing from the scope of the present disclosure, should be considered to be equivalent embodiments of equivalent changes. Any simple modifications, and equivalent changes made to the above embodiments according to the technical concept of the present disclosure without departing from the content of the present disclosure shall fall within the scope of the present disclosure.