Effect of solution treatment on microstructure and hardness of Al-Zn-Mg-Cu super-strength aluminum alloy

doi:10.13251/j.issn.0254-6051.2020.08.036

Abstract

Abstract: Effects of different solid solution treatments on the microstructure after solution and the hardness after solution and aging of Al-Zn-Mg-Cu super-strength aluminum alloy 7050 were studied by means of optical microscopy (OM), scanning electron microscopy (SEM) and Vickers hardness tester. The results show that there is coarse bulk primary phase, needle-like and point-like η(MgZn₂) phase in the microstructure of as-forged 7050 aluminum alloy. With the increase of solution temperature and solution time, the undissolved phase in the alloy decreases, and the volume fraction of recrystallized microstructure increases. The hardness of the 7050 aluminium alloy solution treated at 470 ℃ for 4 h and then aged at 120 ℃ for 24 h reaches the maximum value of 189 HV0.2.

Key words: Al-Zn-Mg-Cu alloy, solution treatment, microstructure, hardness

CLC Number:

TG146.2

Li Zhiyong, Shi Qingnan. Effect of solution treatment on microstructure and hardness of Al-Zn-Mg-Cu super-strength aluminum alloy[J]. Heat Treatment of Metals, 2020, 45(8): 185-188.

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