双级固溶工艺对7050铝合金组织与力学性能的影响  

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

作　　者：姜中涛 汪鑫 周志明[2] 林海涛 杨绪盛 代芳芳 Jiang Zhongtao;Wang Xin;Zhou Zhiming;Lin Haitao;Yang Xusheng;Dai Fangfang(Research Institute for New Materials Technology,Chongqing University of Arts and Sciences,Chongqing 402160,China;College of Materials Science and Engineering,Chongqing University of Technology,Chongqing 400054,China;Southwest Aluminum(Group)Co.,Ltd.,Chongqing 401326,China)

机构地区：[1]重庆文理学院新材料技术研究院,重庆402160 [2]重庆理工大学材料科学与工程学院,重庆400054 [3]西南铝业(集团)有限责任公司,重庆401326

出　　处：《金属热处理》2022年第3期102-106,共5页Heat Treatment of Metals

基　　金：重庆市技术创新与应用发展重点专项(CSTC2019jscx-mbdxX0025)。

摘　　要：采用SEM分析、导电率测试、室温拉伸性能测试等方法,研究了双级固溶工艺对7050铝合金组织演变,以及对双级时效后析出相特征与力学性能的影响。结果表明,与单级固溶处理相比,双级固溶可使难溶的Al_(2)CuMg相完全固溶,显著增加晶内时效析出相的数量,晶界析出相断续分布。双级固溶处理显著提高了7050铝合金的拉伸强度和导电率,同时保持较好的伸长率,抗拉强度达到611.9 MPa,屈服强度达到587.5 MPa,导电率为42.43%IACS,而伸长率为13.5%。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 Al_(2)CuMg 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.

关 键 词：7050铝合金 强化固溶 双级时效 组织 力学性能 

分 类 号：TG113.1[金属学及工艺—物理冶金]