Effect of DH treatment on microstructure and mechanical properties of an LM28-0.3wt.%Nd hypereutectic aluminum silicon alloy

查看全文 作　　者：GAO Bo CHEN Lei YU Fuxiao SUN Shuchen TU [1]Ganfeng

机构地区：[1]School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China

出　　处：《Rare Metals》索引2007年第26卷第6期,共6页

摘　　要：In this article, a novel heat treatment method, deformation heat (DH) treatment (extrusion + aging), was employed on a hypereutectic aluminum silicon alloy (LM28-0.3wt.%Nd), and its effect on microstructure and mechanical properties of this alloy was investigated. It can be concluded that the eutectic microstructure disappears after the DH treatment, in the meantime the morphology of α(Al) solid solution was transformed from fir-tree and cellular to equiaxed, Si was refined with grain sizes of about 1-10 μm and distributed dispersedly, even some of them became globular shape, which can reduce stress accumulation effectively. Mechanical properties test indicated that the DH treatment could significantly improve the room-temperature strength and have little effect on the high-temperature strength of LM28-0.3wt.%Nd alloy. The fracture mechanism is ductile fracture by fracture morphology analysis. 关键词：铝硅合金钕变形处理机械构造

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Effect of DH treatment on microstructure and mechanical properties of an LM28-0.3wt.%Nd hypereutectic aluminum silicon alloy

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