Effect of Er on microstructure and properties of multi-directional  forged 7050 aluminum alloy

doi:10.13251/j.issn.0254-6051.2023.12.038

Abstract

Abstract: 7050 aluminum alloy and Er-containing 7050 aluminum alloy (7E50) were selected as the research object. After solution and aging treatment of free forgings of both aluminum alloys, the microstructure and mechanical properties were studied by means of SEM, TEM and room temperature tensile test. The results show that after 470 ℃×1 h solution treatment, the recrystallized fraction in the 7050 aluminum alloy is 69.45%, while that in the 7E50 alloy is only 62.08%, which shows that the addition of Er can inhibit the recrystallization behavior of the alloy. After the optimal single-stage peak aging process, that is 120 ℃×24 h, the strength, hardness and elongation of the 7E50 alloy are higher than that of the 7050 alloy, it can be seen that the Er addition can effectively improve the mechanical properties of the alloy. The precipitated phases of the 7E50 aluminum alloy are mainly η′ phase, GP region and Al₃(Er ,Zr) particles. The grain boundary precipitated phases of the two alloys show a continuous chain distribution, but the size of grain boundary precipitated phases in the 7E50 alloy is significantly finer than that in the 7050 alloy, which may be one of the main reasons why the elongation of the 7E50 alloy is higher than that of the 7050 alloy.

Key words: 7E50 aluminum alloy, multi-directional forging, heat treatment, microstructure, mechanical properties

CLC Number:

TG146.2

Wang Huaxing, Rong Li, Huang Hui, Wei Wu, Wang Zezhong, Zhou Li, Wang Meng. Effect of Er on microstructure and properties of multi-directional forged 7050 aluminum alloy[J]. Heat Treatment of Metals, 2023, 48(12): 230-235.

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Effect of Er on microstructure and properties of multi-directional forged 7050 aluminum alloy

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