Solute trapping model based on solute drag treatment  

作　　者：王海丰 刘峰 陈正 杨伟 

机构地区：[1]State Key Laboratory of Solidification Processing,Northwestern Polytechnical University

出　　处：《Transactions of Nonferrous Metals Society of China》2010年第5期877-881,共5页中国有色金属学报（英文版）

基　　金：Projects(50501020, 50395103, 50431030) supported by the National Natural Science Foundation of China; Project(NCET-05-870) supported by Program for New Century Excellent Talents in University of China; Project(CX200706) supported by the Doctorate Foundation of Northwestern Polytechnical University,China

摘　　要：A solute trapping model is developed based on a so-called solute drag treatment.By adopting a basic approach of phase-field models,and defining the free energy density in the interfacial region,a suitable interface shape function is introduced to derive the current model,in which the equilibrium and non-equilibrium interface behaviours can be described using a dimensionless parameter L (i.e.an important parameter in the present interface shape function).When applying the current model to Si-9%As (molar fraction) alloy with L=0.5,a good prediction of the steeper profile for high interface velocity,which is analogous to that using a phase-field model of DANILOV and NESLTER,has been obtained.A solute trapping model is developed based on a so-called solute drag treatment.By adopting a basic approach of phase-field models,and defining the free energy density in the interfacial region,a suitable interface shape function is introduced to derive the current model,in which the equilibrium and non-equilibrium interface behaviours can be described using a dimensionless parameter L （i.e.an important parameter in the present interface shape function）.When applying the current model to Si-9%As （molar fraction） alloy with L=0.5,a good prediction of the steeper profile for high interface velocity,which is analogous to that using a phase-field model of DANILOV and NESLTER,has been obtained.

关 键 词：solute trapping solute drag diffusive interface 

分 类 号：O645[理学—物理化学]