等温处理对AlMgLi_(0.5)Zn_(0.5)Cu_(0.2)轻质高熵合金半固态组织影响  

Effect of Isothermal Heat Treatment on the Semi-solid Microstructure of Light-Weight High Entropy Alloy AlMgLi_(0.5)Zn_(0.5)Cu_(0.2)

作　　者：饶丽[1] 金一豪 刘飞 赵龙志[1] 胡勇[1] Rao Li;Jin Yihao;Liu Fei;Zhao Longzhi;Hu Yong(Key Laboratory of Advanced Materials for Vehicles&Laser Additive Manufacturing of Nanchang City,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]华东交通大学载运工具先进材料与激光增材制造南昌市重点实验室,江西南昌330013

出　　处：《华东交通大学学报》2022年第5期97-104,共8页Journal of East China Jiaotong University

基　　金：国家自然科学基金项目(51865011);江西省自然科学基金项目(20212BAB204008)。

摘　　要：采用等温热处理法制备AlMgLi_(0.5)Zn_(0.5)Cu_(0.2)轻质高熵合金半固态坯料,研究保温温度和保温时间对AlMgLi_(0.5)Zn_(0.5)Cu_(0.2)轻质高熵合金半固态组织演变影响。结果表明:随着保温温度增加,AlMgLi_(0.5)Zn_(0.5)Cu_(0.2)轻质高熵合金的晶粒平均尺寸先减小后增大,而圆整度先增大后减小。随着保温时间的延长,AlMgLi_(0.5)Zn_(0.5)Cu_(0.2)轻质高熵合金的晶粒平均尺寸和圆整度均增加。在460℃保温60 min时,AlMgLi_(0.5)Zn_(0.5)Cu_(0.2)轻质高熵合金的的半固态组织最佳,晶粒平均尺寸为41μm,圆整度为0.82,粗化系数K=20.95μm3/s。The semi-solid billet of light-high entropy alloy AlMgLi_(0.5)Zn_(0.5)Cu_(0.2)was prepared by isothermal heat treatment and the effects of holding temperature and holding time on the microstructure evolution of the lighthigh entropy alloy AlMgLi_(0.5)Zn_(0.5)Cu_(0.2)were investigated.The results show that with the increase of holding temperature,the average grain size of semi-solid light-weight high entropy alloy AlMgLi_(0.5)Zn_(0.5)Cu_(0.2)decreases first and then increases,while the roundness of the grains increases first and then decreases.With the prolongation of holding time,the average grain size and roundness of the light-weight high entropy alloy AlMgLi_(0.5)Zn_(0.5)Cu_(0.2)increase.The best semi-solid microstructure of the light-weight high entropy alloy AlMgLi_(0.5)Zn_(0.5)Cu_(0.2)was obtained at 460℃for 60 min,whose average grain size is about 41μm,roundness is 0.82,and coarsest coefficient K=20.95μm3/s.

关 键 词：等温热处理 AlMgLi_(0.5)Zn_(0.5)Cu_(0.2) 轻质高熵合金 半固态 

分 类 号：TG166.4[金属学及工艺—热处理]