Determination of interface width value in phase-field simulation of dendritic growth into undercooled melt  

作　　者：YU Yanmei, YANG Gencang , ZHAO Dawen and LU Yili(State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China) 

出　　处：《Progress in Natural Science:Materials International》2002年第3期212-216,共5页自然科学进展·国际材料（英文版）

基　　金：Supported by the National Natural Science Foundation of China (Grant No. 59971037) ; the Northwestern Polytechnical University Doctoral Dissertation Innovation Foundation.

摘　　要：The influence of the interface width value on the simulation results and its dependence upon thermo-physical parameters in the phase-field simulation of dendritic growth into undercooled melt are investigated. After choosing the reasonable interface width value, the tip velocities of dendritic growth in Ni melt under different undercoolings are calculated and compared with the experimental data in order to benchmark our results. It is shown that the reasonable interface width value， which is determined by the undercooling, anisotropy, interface kinetic, and thermal diffusivity， has to be taken low enough, and the agreement of our results with experimental data verifies that the credible results can be achieved as long as the interface width value is adequately low. This paper provides the basis of determining interface width value in simulating dendritic growth into undercooled melt by phase-field approach.The influence of the interface width value on the simulation results and its dependence upon thermo-physical paxameters in the phase-field simulation of dendritic growth into undercooled melt are investigated. After choosing the reasonable interface width value, the tip velocities of dend-ritic growth in Ni melt under different undercoolings are calculated and compared with the experimental data in order to benchmark our results. It is shown that the reasonable interface width value, which is deter-mined by the undercooling, anisotropy, interface kinetic, and thermal diffusivity, has to be taken low enough, and the agreement of our results with experimental data verifies that the credible results can be achieved as long as the interface width value is adequately low, This paper provides the basis of determining interface width value in simulating dendritic growth into undercooled melt by phase-field approach.

关 键 词：undercooling  DENDRITIC growth  phase-field  INTERFACE width. 

分 类 号：TG111.4[金属学及工艺—物理冶金]