时效制度对7003铝合金组织性能的影响  

Effect of aging system on microstructure and properties of 7003 aluminum alloy

作　　者：李慎兰[1] 刘传生[1] 邱晓慧[1] 徐丽萍 LI Shen-lan;LIU Cliuan-sheng;QIU Xiao-hui;XU Li-ping(Aircraft Maintenance Engineering College,Guangzhou Civil Aviation College,Guangzhou 510470,China;National Engineering Laboratory for Modern Materials Surface Engineering Technology,Guangdong Institute of New Materials,Guangzhou 510651,China)

机构地区：[1]广州民航职业技术学院,飞机维修工程学院,广东广州510470 [2]广东省新材料研究所,现代材料表面工程技术国家工程实验室,广东广州510651

出　　处：《轻合金加工技术》2020年第1期50-54,共5页Light Alloy Fabrication Technology

基　　金：广东省普通高校特色创新项目(2017GKTSCX001);广东省科技计划项目(2017A070701027);广州民航职业技术学院校级项目(18X0136)。

摘　　要：通过室温力学性能测试.导电率测试和透射电子显微镜(TEM)形貌观察,研究了7003铝合金在自然时效T4、单级人工时效T6、双级人工时效153、回归后未经室温停放的RRA-I和回归后经过室温停放三天的RRA-2等不同时效制度下的显微组织变化特征以及性能变化规律。研究结果表明:按照T4→T6→T53→RRA-2的顺序,合金的抗拉强度依次下降,屈服强度依次上升,导电率依次升高;T4状态下的伸长率最高,T6状态下的伸长率最低;RRA-1状态下抗拉强度和屈服强度均偏低;RRA-2状态下抗晶间腐蚀性能最好。综合比较发现,RRA-2是提高试验用7003铝合金综合性能的有效途径。The effects of natural aging-T4,single-stage artificial aging-T6,two-stage artificial aging-T53,RRA-1 without being placed at room temperature after regression and RRA-2 placed three clays at room temperature after regression treatments on the change of microstructure and properties of a 7003 aluminum alloy were investigated by room temperature tensile test,conductivity measurement and transmission electron microscope(TEM)observation.It is shown that the tensile strength decreases,yield strength increases and the electrical conductivity increases in the order of T4→T6→T53→RRA-2.The elongation is highest after nature aging and lowest cifter single-stage aging.The tensile strength and yield strength decrease obviously after RRA-1 treatment.The resistance of intergranular corrosion of 7003 aluminum alloy can be enhanced greatly with RRA-2 process.It is found that RRA-2 is an effective processing to improve the comprehensive performance of investigated 7003 aluminum alloy.

关 键 词：7003铝合金 时效制度 显微组织 力学性能 

分 类 号：TG166.3[金属学及工艺—热处理]