摘要
基于包含固相扩散系数的Karma薄界面相场模型,采用三维自适应网格划分法,研究了界面宽度、热噪声幅值对Al-Si合金过冷熔体中枝晶生长行为的影响。模拟结果表明:随着界面宽度的增加,枝晶形貌的复杂度下降,枝晶尖端生长速度下降,尖端液相处溶质的富集程度下降;随着热噪声幅值的增加,枝晶尖端变化较小,位于枝晶主干两侧的二次枝晶的数量和不对称度增加。
Based on the Karma thin interface phase-field model with the solid diffusivity,the effects of interface width and thermal noise on the dendrite growth behavior in undercooled melt of Al-Si alloy were studied by a three-dimensional adaptive meshing method.The simulation results show that with the increase of interface width,the complexity of dendrite morphology,the dendritic tip velocity and the solute concentration at the tip liquid phase decrease.With the increase of thermal noise amplitude,the dendritic tip changes slightly,and the number and asymmetry of secondary dendrites located on both sides of the dendrite increase.
作者
张冰
赵宇宏
王鸿
陈伟鹏
侯华
Zhang Bing;Zhao Yuhong;Wang Hong;Chen Weipeng;Hou Hua(North University in China,Taiyuan 030051,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2019年第9期2835-2840,共6页
Rare Metal Materials and Engineering
基金
国家自然科学基金(51774254,51774253,51701187,U1610123,51674226,51574207,51574206)
山西省科技重大专项(MC2016-06)
关键词
相场法
枝晶生长
三维自适应网格
界面宽度
热噪声
phase-field method
dendritic growth
three-dimensional adaptive grid
interface width
thermal noise
