Transactions of Materials and Heat Treatment

Title：Influence of the second stage solution temperature on microstructure and properties of aluminum alloy 7050

Authors： Liu Hao Xiao Tiezhong Huang Juan Gao Jing

Unit： Sichuan Engineering Technical College

KeyWords： aluminum alloy 7050 solution temperature corrosion resistance mechanical properties

ClassificationCode：TG146.2

year,vol(issue):pagenumber：2016,41(6):142-145

Abstract：

In order to research the influence of solid solution temperature on aluminum alloy 7050 under two-stage solution and two-stage aging, the effect of the second levels solid solution temperature on microstructure and properties of aluminum alloy 7050 with two-stage solution and two-stage aging heat treatment was studied by tensile test and intergranular corrosion. The results show that the grain size of the alloy increases gradually with the increase of the second levels solid solution temperature, and solid solution of the second phase continues. At temperature of 495℃, the S plase is solid soluted basically, volume fraction of the residual second phase particles is 0.19%, and grain size is smaller with alloy ReL(yield strength) is 655 MPa, Rm(tensile strength) is 694 MPa, A50 mm(elongation) is 14.40%, which shows the best comprehensive performance. When the temperature is too high, alloy performance weakens because of the over burning. The beginning of intergranular corrosion extends from the outer grain boundary of alloy to inner of the grain, and the corrosion resistance of the alloy increases with the decrease of the residual second phase.

Funds：

基金项目:垫江县汽摩配套产业发展分析与研究项目（CSTC2013JCCXB60001）

作者简介：刘浩（1988-），男，硕士，助教 E-mail：464320329@qq.com 通讯作者：肖铁忠（1986-），男，硕士，助教 E-mail：593712861@qq.com

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