数值模拟多晶粒生长形貌  

Research of simulation dendritic growth of polycrystalline

作　　者：郝丽梅[1] 解忧[1] 闫小乐[1] 王瑞平[1] 王亚民[1] 

机构地区：[1]西安科技大学理学院,陕西西安710054

出　　处：《西安科技大学学报》2009年第5期637-641,共5页Journal of Xi’an University of Science and Technology

基　　金：国家自然科学基金项目(50774060);西安科技大学培育基金项目(200847)

摘　　要：基于相场方法,对包含多晶粒的纯物质凝固过程进行了二维数值模拟。以镍为例,展示了界面形貌的生长过程,研究了各向异性参数对枝晶界面形貌的影响。结果表明:随着模拟时间的增加,各晶核由独立生长演化为竞争生长,晶臂间区域的晶臂生长受到抑制。随着各向异性值的增大,各枝晶相貌大小均逐渐增大,同时晶臂间区域减小导致晶臂的竞争生长加强,最后在该区域呈排斥性生长。Numerical simulation based on phase field method is developed to describe two dimensional polycrystalline solidification of pure material including four nuclei,the evolution of the interface morphology is showed and the effect of anisotropy parameter is formulated for nickel.The results indicate that,with increase in time,all of nuclei grow from independence to competition,and the growth is restrained in the range of dendritic arms.With increase in the anisotropy value,the size of every dendritic increase,t...

关 键 词：相场方法 多晶粒 尖端速度 各向异性 

分 类 号：O781[理学—晶体学]