PHASE-FIELD RESEARCH OF MICRO STRUCTURE EVOLUTION FOR DIRECTIONALLY SOLIDIFIED PERITECTIC TRANSITION I. Extension of Trijunction
PHASE-FIELD RESEARCH OF MICRO STRUCTURE EVOLUTION FOR DIRECTIONALLY SOLIDIFIED PERITECTIC TRANSITION I. Extension of Trijunction
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发表时间：
2006-06
影响因子：
2.3
通讯作者：
Xinzhong Li;S. Yanqing;G. Jingjie;Shi-ping Wu;F. Hengzhi
中科院分区：
文献类型：
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作者：
Xinzhong Li;S. Yanqing;G. Jingjie;Shi-ping Wu;F. Hengzhi
通过优化包晶转变对流相场模型中的特征参数，建立了适合模拟特定合金包晶转变微观组织演化的相场模型。使用该模型模拟了高 G/vp 值下定向凝固 Ti-A1 合金的包晶相沿主相表面的生长。模拟结果表明，三结延伸特性的差异会导致离散带和岛带两种典型的微观结构。此外，计算域的宽度、包晶相的形核过冷度和初始成分直接影响定向凝固包晶合金三结的延伸，进而影响最终的显微组织。
A phase-field model was built by optimizing characteristic parameters in the convec-tional 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-A1 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.