Effect of Solutionizing and Aging on Microstructure and Mechanical Properties of Warm-rolled 7075 Alloy  

作　　者：YANG Xiaorong ZHAO Xiaodong CHU Zhibing TUO Leifeng 

机构地区：[1]School of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan,030024,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2023年第2期408-415,共8页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the Key Research and Development Program of Shanxi Province (No.201903D121040)。

摘　　要：The effect of solution and aging treatments on microstructure and mechanical properties of warm-rolled 7075 alloy was investigated via optical microscope,electron backscattered diffraction,transmission electron microscopy and tensile tests.The 7075 alloy was subjected to solution treatments at 450℃for 1 h(ST1),490℃ for 1 h(ST2)and 1.5 h(ST3).Three aging routes were carried out on samples from ST2:one-step(A1),two-step(A2),and three-step aging(A3).The experimental results show mainly recrystallized equiaxed grains in ST1 and ST3 state but a combination of elongated and equiaxed grains in ST2 condition.Three aged alloys have similar microstructures of sample ST2 while the recrystallization frequency gets decreased after aging.The least recrystallization fraction occurs in A2 state.Three aged 7075 alloys all possess enhanced strength and plasticity.Precipitates characterization reveals the maximum strength is achieved in A2 sample as the matrix precipitates are composed mainly of smallηand manyη′phases.Aging route A2 appears preferable to other two aging conditions for attaining a pretty excellent combination of strength and plasticity.

关 键 词：7075 alloy solutionizing AGING PRECIPITATE MICROSTRUCTURE mechanical property 

分 类 号：TG156.9[金属学及工艺—热处理] TG146.21[金属学及工艺—金属学]