PHASE-FIELD RESEARCH OF MICROSTRUCTURE EVOLUTION FOR DIRECTIONALLY SOLIDIFIED PERITECTIC TRANSITION I.Extension of Trijunction
LI Xinzhong; SU Yanqing; GUO Jingjie; WU Shiping; FU Hengzhi
哈尔滨工业大学
Cite this article:
LI Xinzhong; SU Yanqing; GUO Jingjie; WU Shiping; FU Hengzhi. PHASE-FIELD RESEARCH OF MICROSTRUCTURE EVOLUTION FOR DIRECTIONALLY SOLIDIFIED PERITECTIC TRANSITION I.Extension of Trijunction. Acta Metall Sin, 2006, 42(6): 599-605 .
Abstract A phase-field model was built by optimizing characteristic parameters
in the convectional phase-field model for peritectic transition, which
is suitable to simulate microstructure evolution for peritectic transition of
specific alloys. The growth of peritectic phase along the primary phase
surface was
simulated using this model for directionally solidified Ti-Al alloy at
a high value of G/vp. The simulating results show that the
difference of extending character of trijunction will cause two typical
microstructures of discrete band and island band. Furthermore, the width
of computational domain, the nucleation undercooling of peritectic phase
and initial composition affect the extension of trijunction of directionally
solidified peritectic alloy directly, and also the final microstructure.
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