Grain Refinement by Pulse Electric Discharging and Undercooling Mechanism
Grain Refinement by Pulse Electric Discharging and Undercooling Mechanism
复制标题
通过脉冲放电和过冷机制细化晶粒
DOI：
10.1080/10426914.2010.512649
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发表时间：
2011-01-01
影响因子：
4.8
通讯作者：
Liu, Lin
中科院分区：
文献类型：
--
作者：
Zhao, Zhilong;Wang, Jianlong;Liu, Lin
利用放电电容器组对纯铝定向凝固进行高压持续放电。考察了改变凝固组织的条件，包括初始电压和电容器组的电容。实验结果表明，随着初始电压和初始电容的增大，凝固组织由柱状晶转变为等轴晶。然而，当从电容器组中注入的放电能量过大时，会观察到晶粒结构的粗化。分析了脉冲放电对凝固过冷的影响，采用基于形核理论的元胞自动机方法对凝固过程中的组织进行了模拟。
High voltage durative discharge was applied to unidirectional solidifying pure aluminum by discharging capacitor bank. The conditions to modify solidification structures, including initial voltage and capacitance of capacitor bank, were examined. The experimental results showed that the solidification structure was modified from columnar grains to equiaxed grains by increasing initial voltage and capacitance. However, coarsening of grain structures was observed when the discharge energy poured from the capacitor bank was excessive. The effect of pulse electric discharge on undercooling during solidification was analyzed, and the grain structures were simulated using cellular automaton methods based on nucleation theory.