Improved multi-order parameter and multi-component model of polycrystalline solidification  

作　　者：Laishan Yang Zhibo Dong Lei Wang Nikolas Provatas 

机构地区：[1]State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China [2]Max-Planck-Institut für Eisenforschung GmbH,Max-Planck-Straße 1,Düsseldorf,40237,Germany [3]Department of Physics and Centre for the Physics of Materials,McGill University,Montreal,H3A 2T8,Canada

出　　处：《Journal of Materials Science & Technology》2022年第6期217-225,共9页材料科学技术（英文版）

基　　金：financial support by the National Foundation of China under Grant No. 51875131;Nikolas Provatas acknowledges financial support by the Canada Research Chairs (CRC) Program;supported by the China Scholarship Council as a Graduate Trainee at McGill University。

摘　　要：In this paper, we present an improved multi-order parameter model for multi-component model of polycrystalline solidification. We introduce an interpolation function in the phase field dynamical equation to obtain controllable grain boundary energy at large undercooling. The same interpolation function is also employed in the kinetics coefficient to allow for better control of grain boundary migration. Temperature dependent phase field parameters and noise terms are consistently coupled into the dynamics of a binary system in a manner that allows for quantitative simulations in the thin interface limit. The model is applied to multi-phase solidification in Al-Cu alloy, where a parabolic fitting method is employed to model the free energy of Al-Cu phases and two-phase nucleation is demonstrated in directional solidification.

关 键 词：Phase field model MULTI-PHASE MULTI-COMPONENT Grain boundary Consistent nucleation 

分 类 号：TG111.4[金属学及工艺—物理冶金]