Microstructure evolution of semi-solid Mg2Si/A356 composites during remelting process  

作　　者：Yong Hu Sheng-qi Fu Long-zhi Zhao Da-hao Wang Fei Liu 

机构地区：[1]School of Materials Science and Engineering,East China Jiaotong Uinversity,Nanchang 330013,China [2]Key Laboratory of Advanced Materials for Vehicles&Laser Additive Manufacturing of Nanchang City,East China Jiaotong University,Nanchang 330013,China

出　　处：《China Foundry》2020年第5期384-388,共5页中国铸造（英文版）

基　　金：the National Natural Science Foundation of China(Grant No.51865011);the Natural Science Foundation of Jiangxi Province,China(Grant No.20171BAB216031).

摘　　要：The semi-solid processed Mg2Si/A356 composites were fabricated using a sloping plate,and the phase and morphology evolution of the semi-solid Mg2Si/A356 slurry during the remelting process was investigated.Results indicate that compared to as-cast microstructure,the size of primaryα-Al phase and Mg2Si phase of semi-solid microstructure fabricated by using a sloping plate decreases and the morphology ofα-Al phase becomes fine and globular.With increasing the reheating temperature and prolonging the holding time,the primaryα-Al phase spheroidizes,the liquid fraction in semi-solid microstructure increases,and the Chinese script Mg2Si phase embedded in the primaryα-Al phase cannot be observed.The Chinese script Mg2Si phase is distributed in the secondaryα-Al phase and becomes smaller.The net-shaped eutectic phase also becomes finer after reheating.The optimum remelting parameters suitable for thixoforming in this study are remelting at 580℃for 30 min.

关 键 词：SEMI-SOLID MG2SI aluminum matrix composites REMELTING microstructure 

分 类 号：TG146.21[一般工业技术—材料科学与工程]