相场法模拟纯金属枝晶生长参数的优化

胡卫英; 陈长乐

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相场法模拟纯金属枝晶生长参数的优化
Optimization of Parameters Related to Dendritic Growth in Pure Metal by Phase-field Method
2007年第3期页码：182-184
纸质出版日期： 2007 ，
DOI：

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[1]胡卫英,陈长乐.相场法模拟纯金属枝晶生长参数的优化[J].特种铸造及有色合金,2007(03):182-184+160.

Hu Weiying, Chen Changle. Optimization of Parameters Related to Dendritic Growth in Pure Metal by Phase-field Method[J]. Special Casting & Nonferrous Alloys, 2007,(3):182-184.
[1]胡卫英,陈长乐.相场法模拟纯金属枝晶生长参数的优化[J].特种铸造及有色合金,2007(03):182-184+160. DOI：

Hu Weiying, Chen Changle. Optimization of Parameters Related to Dendritic Growth in Pure Metal by Phase-field Method[J]. Special Casting & Nonferrous Alloys, 2007,(3):182-184. DOI：

摘要

用相场模型模拟了过冷纯金属枝晶的生长过程

从中得到了光滑枝晶各模型参数的优化值和不同耦合系数下的尖端速率。模拟结果表明

当过冷度和耦合系数较大时

得到侧枝较发达的枝晶;当各向异性系数较大时

得到变异的枝晶。无扰动的情况下

参数选取不合理也会引发侧枝的产生。为了得到光滑的枝晶

各向异性系数应在0.03

.05范围内

过冷度应在0.55

.65范围内

耦合系数应根据材料的热物性参数确定。

Abstract

The phase-field method was employed to simulate the growth of dendrite in undercooled pure metal to obtain the optimized value of parameters related to models for smooth dendrite and dendritic tip growth velocity with different coupled coefficients.The results indicate that with the increase of undercooling rate and the coupled coefficient

the equaixed dendrite exhibits the morphology of developed side-branching.With high anistropic coupled coefficient

the modified dendrite can be observed.Furthermore

the side-branching dendrite can be generated in the structure if the parameters choice is unproper in the conditions of no-turbulence.