High strength, high toughness a1-zn alloy product and method for producing such product
A high-strength, high-toughness technology, applied to high-strength, high-toughness Al-Zn alloys, the production of high-strength, high-toughness Al-Zn alloy products, alloy plate products, can solve stress corrosion resistance and fracture toughness, Strength loss and other issues, to achieve the effect of excellent performance
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Embodiment 1
[0059] On a laboratory scale, 14 different aluminum alloys were cast into ingots, homogenized, preheated at about 410 °C for more than 6 hours, and hot rolled into 4 mm plates. Solution heat treatment at 475°C followed by water quenching. Thereafter, the quenched product was aged by a two-step T76 aging process.
[0060] The chemical composition is listed in Table 1
[0061] Table 1 Chemical composition (% by weight) of the alloy in sheet form, the balance being aluminum and unavoidable impurities, Fe 0.06, Si 0.05, Ti 0.04 and Zr 0.12.
[0062] Alloy
Cu
Mg
Zn
other
1
2
3
4
5
6
7
8
9
10
11
12
13
14
2.0
2.1
1.7
2.1
2.4
1.7
2.1
2.4
1.7
2.1
2.5
2.1
2.1
2.1
2.1
2.1
1.75
1.7
1.7
2.2
2.1
2.1
2.5
2.4
2.5
2.1
2.1
2.1
8.0
8.1
8.7
...
Embodiment 2
[0084] Additional chemical compositions were processed according to processing steps 1-8 above, using variation 3 and T76 aging of step 5 of Example 1 above.
[0085] Table 3: Chemical composition (wt%) of the sheet alloys, for all alloys the balance is aluminum and unavoidable impurities, Fe 0.06, Si 0.05.
[0086] Alloy
[0087] To test the properties of the alloys in Table 3, the strength is tested in the L direction and the toughness is tested in the L-T direction.
[0088] Table 4: Strength and toughness (MPa) and notch toughness (TS / Rp) of the alloys shown in table 3, according to variant 3.
[0089] Alloy
[0090] The toughness and tensile yield strength (Rp) shown in Table 4 clearly shows that the best toughness and tensile yield strength values are obtained for alloys with about 8.6-8.7 wt% zinc. Alloys with lower zinc levels showed similar toughness values but lower (in general) tensile strength, whereas higher levels of zinc resulted in high...
Embodiment 3
[0092] Additional tests were performed for zinc levels of 8.6 and 8.7, varying copper and magnesium levels. It can be shown that the level of toughness can be increased at the same level of strength. Some additional alloys were processed similarly to Example 2, using the above processing steps 1-8 and variation 3 of Example 1 step 5.
[0093] Table 5. Chemical composition (wt%) of the sheet alloys, for all alloys the balance is aluminum and unavoidable impurities, Fe 0.06, Si 0.05.
[0094] Alloy
Cu
Mg
Zn
Zr
Ti
other
3
4
5
12
13
14
15
16
17
1.7
2.1
2.4
2.5
2.1
1.7
1.7
2.4
2.1
2.2
2.1
2.1
2.5
2.4
2.5
1.7
1.7
1.7
8.7
8.6
8.7
8.7
8.6
8.7
8.7
8.6
8.6
0.12
0.12
0.12
0.11
0.12
0.12
0.12
0.12
0.12
0.03
0.03
...
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