Effect of two-stage solution treatment on microstructure and properties of 7075 high strength aluminum alloy

doi:10.13251/j.issn.0254-6051.2020.03.032

Abstract

Abstract:

Effects of single-stage and two-stage solution treatment on microstructure and mechanical properties of 7075 aluminum alloy were studied by means of optical microscope, electronic universal testing machine and vickers hardness tester. The results show that the second phase particles of 7075 aluminum alloy treated with two-stage solution are much more dissolved into the matrix and have higher solid solubility than those treated with single-stage solution. After 460 ℃×1 h+480 ℃×0.5 h double-stage solution treatment, the volume fraction of the second phase in 7075 aluminum alloy is 0.303%, the grains are uniform and fine, and the solution effect is ideal. The hardness, tensile strength and elongation of 7075 aluminum alloy reach 199 HV5, 637 MPa and 14.1% respectively after 460 ℃×1 h+480 ℃×0.5 h+120 ℃×24 h solution and aging treatment, and the comprehensive properties are the best.

Key words: 7075 aluminum alloy, two-stage solution treatment, microstructure, tensile properties, hardness

CLC Number:

TG146.2

Wang Jiyue, Xu Liping. Effect of two-stage solution treatment on microstructure and properties of 7075 high strength aluminum alloy[J]. HTM, 2020, 45(3): 166-168.

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