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Ultrahigh-strength high-hardenability Al, Zn, Mg and Cu alloy

An al-zn-mg-cu, high hardenability technology, applied in the field of metal alloys, can solve the problems of difficult to meet demand, large differences in the performance of the surface and the core of the product, and the amount of Er added cannot be too high, so as to reduce quenching. effect of sensitivity

Inactive Publication Date: 2012-10-03
BEIJING UNIV OF TECH
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Problems solved by technology

The composition design of 7075, 7050, and 7055 alloys can only meet the requirements for the manufacture of structural parts with a thickness below 120mm. After the thickness is greater than 120mm, the performance difference between the surface and the core of the product is large, and it is difficult to meet the needs of aerospace for super large cross-section aluminum alloy materials.
In the study of rare earth aluminum alloys, considering the cost, Er is an effective alloying element that is expected to change the properties of aluminum alloys after Sc, but the addition of Er should not be too high, otherwise it will affect the properties of the material

Method used

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  • Ultrahigh-strength high-hardenability Al, Zn, Mg and Cu alloy
  • Ultrahigh-strength high-hardenability Al, Zn, Mg and Cu alloy
  • Ultrahigh-strength high-hardenability Al, Zn, Mg and Cu alloy

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Experimental program
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Effect test

Embodiment 1

[0037] The bar of alloy Al-10.0Zn-1.6Mg-1.4Cu-0.12Zr was treated in the same way, and its end quenching hardness value was obtained as shown in Table 3. The hardness of the water-quenched end is 209HV, the hardness of the most distal end is 186HV, the absolute value of the hardness decrease is 23, the decrease percentage is 11.0%, and the single-end hardening depth is about 82mm.

[0038] Table 3 Al-10.0Zn-1.6Mg-1.4Cu-0.12Zr end quenching hardness test results

[0039]

[0040] The end quenching curve of comparative example 1 alloy is shown in Figure 4 , the end quenching curve of the comparative example 2 alloy is shown in Figure 5 , the end quenching curve of the alloy of the present invention is shown in Image 6 , the comparison of the end quenching curves of the three alloys is shown in Figure 7 .

[0041] The three alloys are within the effective hardness range (hardness loss 10%), the depth of Comparative Example 1 and Comparative Document 2 is 60mm, while the...

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Abstract

Ultrahigh-strength high-hardenability Al, Zn, Mg and Cu alloy belongs to the technical field of metal alloy. The ultrahigh-strength high-hardenability Al, Zn, Mg and Cu alloy comprises 10.0% of Al, 1.6% of Zn, 1.4% of Mg, 0.12% of Cu and Zr. Hardening depth of the alloy is increased by 32%, while hardening degree is lowered by 3.3%. Improvement action of alloy microelements on hardenability is not obvious. Therefore, quenching sensitivity of the alloy is lowered by increasing Zn-to-Mg ratio and controlling copper content, while cost is not evidently increased.

Description

technical field [0001] The invention belongs to the technical field of metal alloys, in particular to an ultrahigh-strength and high-hardenability Al-Zn-Mg-Cu alloy. Background technique [0002] The main body of ultra-high-strength aluminum alloy is Al-Zn-Mg-Cu series (referred to as 7000 series) alloy. This series of aluminum alloy has good plasticity, toughness, stress corrosion resistance and processing performance. It can be rolled, extruded and forged. It is processed into various rods, wires, profiles, plates and titanium alloys for aviation and resin-based composite materials that the modern aviation industry is very concerned about. Compared with ultra-high-strength aluminum alloys, the cost is relatively low, and they are widely used in aerospace and transportation. Manufacturing of various lightweight structural parts. [0003] In the past 30 years, the modern aerospace industry has developed rapidly and the level of science and technology has been continuously i...

Claims

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Application Information

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IPC IPC(8): C22C21/10
Inventor 陈子勇肖功杰聂祚仁
Owner BEIJING UNIV OF TECH
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