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中文摘要：
通过对当前包晶相变相场模型特征参数的优化，建立了适合对具体合金包晶相变微观组织演化进行模拟的相场模型．利用该模型对高Olvp定向凝固Ti—Al合金的单个包晶相核心依附初生相表面的生长行为进行了模拟．结果表明，三相交节点延伸特性的差异将导致形成离散带状和岛屿带状两种典型组织．并且，计算域宽度，包晶相形核过冷度和初始成分直接影响到定向凝固包晶合金三相交节点的延伸，也就影响到其最终的微观组织．
英文摘要：
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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