Microstructure Evolution of a Ternary Monotectic Alloy During Directional Solidification  

作　　者：Shu Chen Jiu-Zhou Zhao Hong-Xiang Jiang Jie He 

机构地区：[1]Institute of Metal Research,Chinese Academy of Sciences

出　　处：《Acta Metallurgica Sinica(English Letters)》2015年第3期316-321,共6页金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.51471173,51271185 and 51031003);China Manned Space Engineering

摘　　要：A model was developed to describe the microstracture evolution in a directionally solidified ternary monotectic alloy.The directional solidification experiments were carried out on Al-3Pb-lSn（wt%） alloys by using a Bridgman apparatus.The microstracture evolution in the directionally solidified sample was calculated.The numerical results agree well with the experimental ones.It is demonstrated that the nucleation of the minority phase droplets occur at two different positions.One corresponds to the liquid-liquid decomposition,which occurs in front of the solidification interface.The other is at the liquid/solid interface.The nucleation rate of the minority phase droplets at the liquid/solid interface is significantly higher than at the position in front of the solidification interface.The characteristic of the nucleation process leads to a bimodal size distribution of the minority particles in the directionally solidified sample.A model was developed to describe the microstracture evolution in a directionally solidified ternary monotectic alloy.The directional solidification experiments were carried out on Al-3Pb-lSn（wt%） alloys by using a Bridgman apparatus.The microstracture evolution in the directionally solidified sample was calculated.The numerical results agree well with the experimental ones.It is demonstrated that the nucleation of the minority phase droplets occur at two different positions.One corresponds to the liquid-liquid decomposition,which occurs in front of the solidification interface.The other is at the liquid/solid interface.The nucleation rate of the minority phase droplets at the liquid/solid interface is significantly higher than at the position in front of the solidification interface.The characteristic of the nucleation process leads to a bimodal size distribution of the minority particles in the directionally solidified sample.

关 键 词：Ternary monotectic alloy Directional solidification Modeling 

分 类 号：TG111.4[金属学及工艺—物理冶金]