Transactions of Materials and Heat Treatment

Title：Influence of aging process on microstructure and properties of 7075 aluminum alloy by electromagnetic forming

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ClassificationCode：TG166.3

year,vol(issue):pagenumber：2020,45(10):163-169

Abstract：

In order to explore the influence law of aging treatment time on the microstructure and properties of 7075 aluminum alloy in electromagnetic forming, the aging treatment process experiment of unidirectional tensile specimens by electromagnetic forming was carried out. Then, the formed parts were cut, and the influences of aging time on the aging precipitation behavior and mechanical properties of 7075 aluminum alloy in electromagnetic forming were studied by methods of tensile tests, optical microscope, scanning electron microscope, transmission electron microscope and so on. The results show that the dislocations produced by electromagnetic forming are conductive to the nucleation, precipitation and growth of η′ precipitated phase. With the increasing of aging time, the dislocation density decreases, the number of η′ precipitated phase reduces, and the number and size of η precipitated phase increase. When the aging time is 9 h, a large number of fine-dispersed η′ and η precipitated phases precipitate at the same time in the matrix, and the comprehensive properties of material are the best with the tensile strength of 598.3 MPa, the yield strength of 568.36 MPa, the elongation of 4.48% and the hardness of 178.3 HV.

Funds：

国家自然科学基金资助项目(51775563, 51405173)；中南大学高性能复杂制造国家重点实验室(ZZYJKT2017-03)；华中科技大学材料成形与模具技术国家重点实验室开放课题研究基金(P2017-013)

周向龙(1992-)，男，硕士研究生 E-mail：173812050@csu.edu.cn 通讯作者：崔晓辉(1984-)，男，博士，副教授 E-mail：cuixh622@csu.edu.cn

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