Investigation on microstructures and properties of semi-solid Al_(80)Mg_(5)Li_(5)Zn_(5)Cu_(5)light-weight high-entropy alloy during isothermal heat treatment process  

作　　者：Yong Hu Yuan-yuan Liu Long-zhi Zhao Yan-chuan Tang Hai-tao Jiao De-jia Liu 

机构地区：[1]State Key Laboratory of Performance Monitoring Protecting of Rail Transit Infrastructure,East China Jiaotong University,Nanchang 330013,China [2]School of Materials Science and Engineering,East China Jiaotong University,Nanchang 330013,China

出　　处：《China Foundry》2022年第6期519-527,共9页中国铸造（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.51865011);the Natural Science Foundation of Jiangxi Province,China(Grant No.20212BAB204008).

摘　　要：The Al_(80)Mg_(5)Li_(5)Zn_(5)Cu_(5)light-weight high-entropy alloy with globular microstructure was fabricated by isothermal heat treatment.The effects of isothermal temperatures and holding times on the semi-solid microstructure evolution were investigated.The results indicate that,with increase of the isothermal temperature,the average grain size increases and the spheroidization time shortens.With prolongation of holding time,the shape factor increases firstly and then decreases,and the average grain size decreases at first and then increases when the isothermal temperature is below 520°C,however it increases gradually at 540℃.The optimal semi-solid microstructure is obtained at 520℃ for 30 min,whose shape factor and average grain size are 0.90 and 56.4μm,respectively.Compared with as-cast Al_(80)Mg_(5)Li_(5)Zn_(5)Cu_(5) light-weight high-entropy alloy,the compressive strength and plasticity of semi-solid Al_(80)Mg_(5)Li_(5)Zn_(5)Cu_(5) light-weight high-entropy alloy are increased by 36%and 108%,respectively.The formation of semi-solid microstructures includes three stages:melting separation,spheroidization,and coarsening growth.The sluggish diffusion effect of Al_(80)Mg_(5)Li_(5)Zn_(5)Cu_(5) light-weight high-entropy alloy leads to a low coarsening rate,resulting in slow grain growth.

关 键 词：light-weight high-entropy alloy SEMI-SOLID isothermal heat treatment microstructure 

分 类 号：TG146.21[一般工业技术—材料科学与工程]