摘要
本文利用TEM考察了生长速度R为30～2500μm/s、Sr加入量为0.1％时Al-12.7％Si共晶的微观结构。研究结果表明,共晶硅相中孪晶密度较高且常常有两个或两个以上的{111}系孪晶同时启动,生长速度对孪晶密度和孪晶特征有很大影响。共晶硅的择优生长方向为<21>方向,其微观结构可视为由许多被微孪晶或层错分割开的亚晶粒组成。共晶铝相为多晶组织且共晶铝、硅相间不存在确切的择优取向关系。
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.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
1993年第3期252-257,共6页
Journal of University of Science and Technology Beijing
