凝固相场模拟中若干问题的讨论
Remarks on some open problems in phase-field modelling of solidification
摘要:
三个不同的主题在凝固的相场建模进行了讨论,特别强调目前可用的建模方法的局限性。首先,薄界面限制的双边相场模型进行了检查,它表明,反陷阱电流一般不足以消除所有的薄界面的影响。其次,分析了多晶凝固的取向场模型,指出在共格多晶物质中,取向场的标准弛豫运动方程是不正确的。第三,它指出,标准的程序,将波动相场的方法不能直接用于定量描述成核。
英文摘要:
Three different topics in phase-field modelling of solidification are discussed, with particular emphasis on the limitations of the currently available modelling approaches. First, thin-interface limits of two-sided phase-field models are examined, and it is shown that the antitrapping current is in general not sufficient to remove all thin-interface effects. Second, orientation-field models for polycrystalline solidification are analysed, and it is shown that the standard relaxational equation of motion for the orientation field is incorrect in coherent polycrystalline matter. Third, it is pointed out that the standard procedure to incorporate fluctuations into the phase-field approach cannot be used in a straightforward way for a quantitative description of nucleation.
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