MODELING OF DENDRITIC STRUCTURE AND MICROSEGREGATION IN SOLIDIFICATION OF Al-RICH QUATERNARY ALLOYS
A two-dimensional (2D) coupled cellular automaton (CA)-PanEngine model was developed for the simulation of dendritic growth and microsegregation in solidification of quaternary alloy system. In the model, the CA approach was employed to simulate the evolution of dendritic growth. The dynamics of dendritic growth was calculated according to the difference between the local equilibrium liquidus temperature and the actual temperature, incorporating with the Gibbs-Thomson effect. Based on the local liquid compositions of the three solutes determined by solving the solutal transport equation in the domain, the local equilibrium liquidus temperature and the solid concentrations of the three solutes at the solid/liquid (SL) interface were calculated using the thermodynamic calculation software package PanEngine. The model was validated through the comparisons of the simulated results with the Scheil predictions for the solid composition profiles as a function of solid fraction in an Al-4.5wt％Cu-0.5wt％ Mg-lwt％Si alloy. It has been demonstrated that the present model can be used to simulate the evolution of dendritic growth morphology and to predict the microsegregation patterns in solidification of quaternary Al-rich alloys.
Solidification modeling cellular automaton PanEngine dendritic growth microsegregation Al-rich quaternary alloy
Ting DAI Mingfang ZHU Shuanglin CHEN Weisheng CAO Chun-Pyo HONG
School of Materials Science and Engineering, Southeast University Nanjing 210096, China CompuTherm LLC 437 S. Yellowstone Dr., Suite 217 Madison WI 53719, USA Center for Computer-Aided Materials Processing (CAMP), Dept. of Metallurgical Engineering, Yonsei Un
国际会议
大连
英文
223-232
2007-08-19（万方平台首次上网日期，不代表论文的发表时间）