Stability range of tilted dendritic arrays during directional solidification  

作　　者：XING Hui ZHAO Xiao Bin DUAN Pei Pei CHEN Chang Le CHEN Zhi JIN Ke Xin 

机构地区：[1]Key Laboratory of Space Applied Physics and Chemistry, Shaanxi Key Laboratory for Condensed Matter Structure and Properties, Northwestern Polytechnical University

出　　处：《Science China(Technological Sciences)》2014年第12期2530-2535,共6页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.61078057 and 51172183);the Natural Science Foundation of Shaanxi Province in China(Grant No.2012JQ8013);the Fundamental Research Funds for the Central Universities(Grant Nos.3102014KYJD026 and JC20120246);the grant from the Program of New Staff and Research Area Project of NPU(Grant No.13GH014602)

摘　　要：The stability range of primary spacing of the tilted dendritic arrays in directional solidification has been studied by quantitative phase-field simulations. Results show that both the real growth direction and morphological shapes of dendritic arrays change with the primary spacing for different misorientation angles(θ0). It has been found that the lower limit of primary spacing is independent of θ0, but the upper limit of primary spacing is strongly influenced by that. The two kinds of tertiary branching instabilities result in different behaviors of the variation of the upper limit with misorientation angle for different pulling velocities.

关 键 词：directional solidification stability range titled growth phase-field model 

分 类 号：TG111.4[金属学及工艺—物理冶金]