Optimization of Cu content for the development of high-performance T5-treated thixo-cast Al-7Si-0.5Mg-Cu(wt.%)alloy  

作　　者：K.Yamamoto M.Takahashi Y.Kamikubo Y.Sugiura S.Iwasawa T.Nakata S.Kamado 

机构地区：[1]Nagaoka University of Technology,Nagaoka,Japan [2]Asanuma Giken Co.,Ltd.,Hamamatsu,Japa [3]Industrial Research Institute of Shizuoka Prefecture,Shizuoka,Japan

出　　处：《Journal of Materials Science & Technology》2021年第34期178-190,共13页材料科学技术（英文版）

基　　金：supported by JSPS KAKENHI(Nos.JP18H03837,JP19K15321);Advanced Low Carbon Technology Research and Development Program(ALCA)(No.12102886);Nagaoka University of Technology(NUT)Presidential Research Grant。

摘　　要：Cu content has been successfully optimized in a thixo-cast and directly aged(T5-treatment)Al-7 Si-0.5 Mg(wt.%)alloy.Even after the 0.5%Cu addition,plate-like Al_(2)Cu(θ’)phases,which contribute to high strengths and large plasticity,are precipitated.The formation of a large fraction of Cu-containing brittle phases could be suppressed as well.Then,the Al-7Si-0.5Mg-0.5Cu alloy exhibits high ultimate tensile strength,0.2%proof stress,and elongation to failure of 296 MPa,209 MPa,and 8.8%,respectively.This results in a high quality index similar to that of solution-treated and subsequently aged(T6-treated)Al-7 Si-Mg alloys.A Cu addition over 1.0%further improves the strengths;however,this leads to poor ductility because of the high fraction of Cu-containing brittle phases.

关 键 词：Al-Si-Mg-Cu alloy Thixo-casting T5-treatment Mechanical property Microstructure 

分 类 号：TG146.21[一般工业技术—材料科学与工程]