The Microstructure of Al-12.7%Si Eutectic Modified with Sr
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摘要: 本文利用TEM考察了生長速度R為30~2500μm/s、Sr加入量為0.1%時Al-12.7%Si共晶的微觀結構。研究結果表明,共晶硅相中孿晶密度較高且常常有兩個或兩個以上的{111}系孿晶同時啟動,生長速度對孿晶密度和孿晶特征有很大影響。共晶硅的擇優生長方向為<211>方向,其微觀結構可視為由許多被微孿晶或層錯分割開的亞晶粒組成。共晶鋁相為多晶組織且共晶鋁、硅相間不存在確切的擇優取向關系。Abstract: The microstructure of Al-12.7%Si eutectic with addition of 0.1%Sr has been investigated across arrange of growth rate from 30 μm/s to 2 500μm/s with the aid of TEM. It has been shown that eutectic silicon phases contain high density of twins on two or more {111} systems and twin density and behavior are dependent on the growth rate. The preferred growth axis of silicon phases is in a <211 >irection and the microstructure of silicon phase can been seen as consisting of subgrains seperated by microtwins and/or stacking faults. Eutectic aluminum phases is multicrystal. There are no preferred matching relationship between eutectic aluminum and silicon phases.
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Key words:
- Al-Si eutectic /
- modification /
- microstructure /
- twin
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