Anti-recrystallization super-strength high-toughness corrosion-resistant aluminum alloy and preparation method thereof

Abstract

The invention discloses anti-recrystallization super-strength high-toughness corrosion-resistant aluminum alloy and a preparation method thereof. The aluminum alloy product comprises, by weight, 6.0%-10.0% of Zn, 1.8%-2.5% of Mg, 0.6-2.2% of Cu, 0.1%-0.2% of Zr, 0.02%-0.15% of Fe, 0.001%-0.10% of Si, 0.01%-0.05% of Cr, 0.01%-0.05% of Ti, 0.02%-0.10% of RE (RE is the elements of Yb, Er and Y) and the balance Al. The aluminum alloy material components meet the conditions that the content of the Cr and the Si is larger than or equal to 0.25 Zr and smaller than or equal to 0.5 Zr, and the content of the Cr is larger than or equal to 0.5 Si and smaller than or equal to that of the Si; and the content of the Fe / Si is larger than or equal to 0.7 and smaller than or equal to 1.5, and the content of the RE and the Ti is larger than or equal to 0.5 Zr and smaller than or equal to 0.75 Zr. According to the anti-recrystallization super-strength high-toughness corrosion-resistant aluminum alloy and the preparation method thereof, the component proportion is reasonable, matching among microalloying elements is strictly controlled by conducting optimization selection on the microalloying elements, multielement coherent dispersed phases are formed, and recrystallization of an alloy matrix can be completely inhibited; and compared with existing super-strength aluminum alloy of the same kind, the anti-recrystallization super-strength high-toughness corrosion-resistant aluminum alloy has higher strength, toughness and corrosion resistance, and the problem that the strength, the toughness and the corrosion resistance of existing Al-Zn-Mg-Cu super-strength alloy cannot all be achieved is solved. The anti-recrystallization super-strength high-toughness corrosion-resistant aluminum alloy and the preparation method thereof are easy to operate and suitable for industrial production.

Description

technical field [0001] The invention discloses a recrystallization-resistant super-strength, high-toughness, corrosion-resistant aluminum alloy and a preparation method thereof. By designing the ratio of microalloying elements in the Al-Zn-Mg-Cu series aluminum alloy composition, its strength, The invention relates to toughness and corrosion resistance, and belongs to the technical field of metal material preparation. Background technique [0002] Al-Zn-Mg-Cu ultra-high-strength aluminum alloy has the advantages of low density, high strength, and easy processing. It is an important structural material in industries such as aircraft, rockets, rail transit, and weaponry. It plays an important role in economic and social development and national defense modernization. play an extremely important role. However, the Al-Zn-Mg-Cu ultra-high-strength aluminum alloy has the problem of stress corrosion cracking caused by the aggregation of high-density aging precipitates at the grain...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, and to provide a super-strong, high-toughness, corrosion-resistant aluminum alloy with reasonable component ratio and its preparation method. The optimized selection of alloying elements strictly controls the matching between multivariate microalloying elements to form multivariate coherent dispersed phases to completely inhibit recrystallization and realize the preparation of aluminum alloys with high strength, high toughness and good corrosion resistance, overcoming the existing Al-Zn-Mg-Cu super-strength aluminum alloy has the problem of incompatibility between strength, toughness and corrosion resistance

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