【摘 要】
：
Cu content has been successfully optimized in a thixo-cast and directly aged (T5-treatment) Al-7Si-0.5Mg (wt.％) alloy.Even after the 0.5％ Cu addition,plate-like Al2Cu (θ\') phases,which contribute to high strengths and large plasticity,are precipitated.
【机 构】
：
Nagaoka University of Technology,Nagaoka,Japan;Asanuma Giken Co.,Ltd.,Hamamatsu,Japan;Asanuma Giken
论文部分内容阅读
Cu content has been successfully optimized in a thixo-cast and directly aged (T5-treatment) Al-7Si-0.5Mg (wt.％) alloy.Even after the 0.5％ Cu addition,plate-like Al2Cu (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-7Si-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.
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