文献类型：期刊文章

作　　者：孙伟华[1,2] 张利军[1,2] 魏明[1,2] 杜勇[1,2] 黄伯云[1]

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]中南大学中德铝合金微结构联合实验室,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》

基　　金：Projects (51021063,51301208) supported by the National Natural Science Foundation of China;Project (GZ755) supported by Sino-German Center for Promotion of Science;Project (2011CB610401) supported by the National Basic Research Program of China;Project supported by Shenghua Scholar Program of Central South University,China

年　　份：2013

卷　　号：23

期　　号：12

起止页码：3722-3728

语　　种：中文

收录情况：AJ、CAS、CSA、CSA-PROQEUST、CSCD、CSCD2013_2014、EBSCO、EI、IC、INSPEC、JST、SCIE、SCOPUS、WOS、ZGKJHX、普通刊

摘　　要：（The effect of liquid diffusion coefficients on the microstructure evolution during solidification of primary （Al） phase in Al356.1 alloy was investigated by means of the phase-field simulation using two sets of diffusion coefficients in liquid phase, while fixing other thermophysical and numerical parameters. The first set is only with impurity coefficients of liquid phase in Arrhenius formula representing only the temperature dependence. While the second set is with the well-established atomic mobility database representing both temperature and concentration dependence. For the second set of liquid diffusion coefficients, the effect of non-diagonal diffusion coefficients on the microstructure evolution in Al356.1 alloy during solidification was also analyzed. The differences were observed in the morphology, tip velocity and composition profile ahead of the tip of the dendrite due to the three cases of liquid diffusivities. The simulation results indicate that accurate databases of mobilities in the liquid phase are highly needed for the quantitative simulation of microstructural evolution during solidification.

关 键 词：Al356.1 alloy  SOLIDIFICATION microstructure evolution  diffusion coefficient  phase-field simulation  

分 类 号：TG146.21[材料类]