Thermo-Calc based multi-component micro-segregation model and solidification paths calculations  

作　　者：Zhao Guangwei Li XinZhong Xu Daming Guo Jingjie Fu Hengzhi Du Yong He Yuehui 

机构地区：[1]School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China [2]State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,Hunan,China

出　　处：《China Foundry》2012年第3期269-274,共6页中国铸造（英文版）

基　　金：supported by the Open Project of State Key Laboratory of Powder Metallurgy of Central South University (Grant No. 2008112042);the National Natural Science Foundation of China (Grant Nos. 51071062 and 50801019);Project 973 (Grant No. 2011CB610406)

摘　　要：On the basis of a multi-length scale modeling, a mixture-averaged multi-component/multiphase micro- segregation model was proposed without pre-set function for the micro-scale solute profile. The model explains the effect of morphologies of solidifying phases and solid back diffusion （SBD） on segregation, and covers the two limiting solidification cases of Scheil and Lever-rule models. A commercial Thermo-Calc software package/database was linked to the algorithms via its TQ6-interface for instantaneous determination of the related thermodynamic data of the multi-component alloys. The influences of cooling rate and other parameters on the solidification path and micro-segregation behavior were numerically investigated by sample calculation of the ternary AI-Cu-Mg alloys. A parallel experimental investigation on AI-Cu-Si alloys solidified under different cooling conditions was conducted to validate the theoretical model. Reasonable agreements were gained between the predicted solidification paths and the measured results.On the basis of a multi-length scale modeling, a mixture-averaged multi-component /multiphase micro-segregation model was proposed without pre-set function for the micro-scale solute profile. The model explains the effect of morphologies of solidifying phases and solid back diffusion (SBD) on segregation, and covers the two limiting solidification cases of Scheil and Lever-rule models. A commercial Thermo-Calc software package/database was linked to the algorithms via its TQ6-interface for instantaneous determination of the related thermodynamic data of the multi-component alloys. The influences of cooling rate and other parameters on the solidification path and micro-segregation behavior were numerically investigated by sample calculation of the ternary Al-Cu-Mg alloys. A parallel experimental investigation on Al-Cu-Si alloys solidified under different cooling conditions was conducted to validate the theoretical model. Reasonable agreements were gained between the predicted solidification paths and the measured results.

关 键 词：solidification path MICRO-SEGREGATION multi-component/multi-phase alloys THERMO-CALC 

分 类 号：TG111.4[金属学及工艺—物理冶金] TP393.4[金属学及工艺—金属学]