7075铝合金半固态触变挤压件的显微组织和力学性能  

Microstructure and mechanical properties of7075 aluminum alloy parts formed by semi-solid thixoextrusion

作　　者：肖冠菲 姜巨福[2] 王迎[3] 刘英泽 张颖 郭保永 何震[1] 鲜希睿 Guan-fei XIAO;Ju-fu JIANG;Ying WANG;Ying-ze LIU;Ying ZHANG;Bao-yong GUO;Zhen HE;Xi-rui XIAN(Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China,Chengdu 610213,China;School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China;School of Mechatronics Engineering,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]中国核动力研究设计院核反应堆系统设计技术重点实验室,成都610213 [2]哈尔滨工业大学材料科学与工程学院,哈尔滨150001 [3]哈尔滨工业大学机电工程学院,哈尔滨150001

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第11期3235-3249,共15页中国有色金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.51875124).

摘　　要：通过触变挤压工艺对热挤压态7075铝合金深腔圆筒形零件进行成形,分析等温温度和保温时间对成形件显微组织和力学性能的影响。通过正交试验优化T6热处理工艺参数,研究T6热处理对成形件显微组织和力学性能的影响。结果表明,通过触变挤压可以成功成形表面光滑的深腔圆筒形零件,成形温度和加热时间对成形件的金相组织有显著影响。T6热处理可以大大提高深腔圆筒形零件的力学性能,最优的T6热处理工艺参数为:465℃固溶16h,150℃时效16h。当半固态坯料在600℃加热10min后,成形的深腔圆筒形零件具有最佳的综合力学性能,其极限抗拉强度为573.57MPa,伸长率为13.44%,显微硬度为HV187.12。Hot-extruded 7075 aluminum alloy was used to form deep cavity cylinders by thixoextrusion.The effects of isothermal temperature and soaking time on the microstructure and mechanical properties of the formed parts were analyzed.The parameters of T6 heat treatment were optimized by orthogonal test,and the influence of T6 heat treatment on the microstructure and mechanical properties of the formed parts was studied.The results indicated that the deep cavity cylinder with a smooth surface could be successfully formed through thixoextrusion.The forming temperature and heating time had remarkable effects on the metallographic structure of the formed components.T6 heat treatment could greatly enhance the mechanical properties of the deep cavity cylinders.The optimum parameters of T6 heat treatment were achieved as:solution at 465℃ for 16 h and aging at 150℃ for 16 h.When semi-solid billets were heated at 600℃ for 10 min,the formed deep cavity cylinder had the best mechanical properties with the ultimate tensile strength of 573.57 MPa,the elongation of 13.44%,and the microhardness of HV 187.12.

关 键 词：7075铝合金 半固态触变成形 热处理 显微组织 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]