【摘 要】
：
Correlation between site occupation evolution of alloying elements in L12 phase and growth of DO22 phase in Ni75Al7.5V17.5 is studied using microscopic phase field model.The results demonstrate that t
【出 处】
：
2012 Postdoctoral Symposium of China on Materials Science &
论文部分内容阅读
Correlation between site occupation evolution of alloying elements in L12 phase and growth of DO22 phase in Ni75Al7.5V17.5 is studied using microscopic phase field model.The results demonstrate that the growing process of DO22 phase can be divided into two stages.At the early stage, composition in the centre part of L12 phase almost remains unchanged, and the nucleation and growth of DO22 phase is controlled by the decreasing of interface between L 12 phases.At the late stage, part of V for growth of DO22 phase is supplied from the centre part of L12 phase and mainly comes from Al sublattice, the excess Ni spared from the decreasing L12 phase migrates into the centre part of L12 phase and occupies the Ni sublattices exclusively, while the excess Al mainly occupies the Al sublattice.At the late stage, the growth of DO22 phase is controlled by the evolution of antisite atoms and ternary additions in the centre part of L 12 phase.
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