Rapidly modifying microstructure and mechanical properties of AA7150 Al alloy processed with electropulsing treatment  

作　　者：Kai Chen Lihua Zhan Wenfang Yu 

机构地区：[1]College of Mechanical and Electrical Engineering of Central South University,Changsha 410083,China [2]State Key Laboratory of High-Performance Complex Manufacturing,Central South University,Changsha 410083,China [3]Light Alloy Research Institute of Central South University,Changsha 410083,China

出　　处：《Journal of Materials Science & Technology》2021年第36期172-179,共8页材料科学技术（英文版）

基　　金：financially supported by the Fundamental Research Funds for the National Key R&D Program of China(No.2017YFB0306300);the Hunan Provincial Innovation Foundation for Postgraduate(No.CX20200185);the Fundamental Research Funds for the Central Universities of Central South University(No.2020zzts098);the National Natural Science Foundation of China(Nos.19055551,51675538 and 51601060)。

摘　　要：Studies show that the proper solid solution treatment(SST)is a key step in the precipitation strengthening of AA7150 Al alloy.Despite the superior characteristics of the fully dissolved phase,it has major drawbacks,including high consumption of energy and low efficiency.Recently,electropulsing treatment(EPT)has been proposed to study dissolved precipitations and modify microstructures of AA7150 Al alloy faster than conventional SST.Experiments have been conducted in the present article,and the obtained results show that EPT can promote the rapid dissolution of theη’phase at relatively low temperatures in only 20 s.Meanwhile,the strength and ductility of electropulsed samples decrease drastically.Compared with conventional SST,EPT accelerates recrystallization and obtains relatively fine grains after 20 and 50 s electric pulses.Moreover,as the EPT time increases,the corresponding non-uniform local heating and the electron force promote dislocation generation and annihilation.

关 键 词：AA7150 Al alloy Electropulsing treatment Rapid dissolution RECRYSTALLIZATION DISLOCATION 

分 类 号：TG146.21[一般工业技术—材料科学与工程]