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张冰,赵宇宏,王鸿,陈伟鹏,侯华.Al-Si合金枝晶形貌的三维相场模拟[J].稀有金属材料与工程(英文),2019,48(9):2835~2840.[ZHANG Bing,ZHAO Yuhong,WANG Hong,CHEN Weipeng and HOU Hua.Three-dimensional phase field simulation of dendritic morphology of Al-Si alloy[J].Rare Metal Materials and Engineering,2019,48(9):2835~2840.]
Three-dimensional phase field simulation of dendritic morphology of Al-Si alloy
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Received:March 07, 2018??Revised:May 20, 2018
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Key words:?Phase-field Method??Dendritic Growth??Three-dimensional Adaptive Grid??Interface Width??Thermal Noise
Foundation item:国家自然科学基金(项目号51774254,51774253,51701187,U1610123,51674226,51574207,51574206), 山西省科技重大专项资助(项目号MC2016-06)资助
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ZHANG Bing,ZHAO Yuhong,WANG Hong,CHEN Weipeng and HOU Hua??
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Abstract:
??????Based on the Karma thin interface phase-field model which include 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 using three-dimensional adaptive meshing method. The simulation results show that with the increase of interface width, the complexity of dendrite morphology decreases, the dendritic tip velocity decreases and the solute concentration at the tip liquid phase decreases. With the increase of thermal noise amplitude, the dendritic tip changes small, the number and asymmetry of secondary dendrites located on both sides of the dendrite increases.