Effect of two-step solution process on microstructure and  mechanical properties of 7050 aluminum alloy

doi:10.13251/j.issn.0254-6051.2022.03.020

Abstract

Abstract: Effect of two-step solution process on microstructure evolution of the 7050 aluminum alloy and precipitate characteristics and mechanical properties after two-step aging was tudied by means of SEM analysis, electrical conductivity testing and room temperature tensile performance testing. The results show that compared with the single stage solution, two-step solution can completely dissolve the insoluble Al₂CuMg phase, significantly increase the number of aging precipitates within grains, and the precipitates on the grain boundary are distributed intermittently. The two-step solution treatment significantly increases tensile strength and conductivity of the 7050 aluminum alloy while maintaining better elongation, with 611.9 MPa of the tensile strength, 587.5 MPa of the yield strength, 42.43%IACS of the electrical conductivity, and 13.5% of the elongation.

Key words: 7050 aluminum alloy, enhanced solution, two-step aging, microstructure, mechanical properties

CLC Number:

TG113.1

Jiang Zhongtao, Wang Xin, Zhou Zhiming, Lin Haitao, Yang Xusheng, Dai Fangfang. Effect of two-step solution process on microstructure and mechanical properties of 7050 aluminum alloy[J]. Heat Treatment of Metals, 2022, 47(3): 102-106.

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Effect of two-step solution process on microstructure and mechanical properties of 7050 aluminum alloy

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