Dendrite to symmetry-broken dendrite transition in directional solidification of non-axially oriented crystals  

作　　者：邢辉 王建元 陈长乐 金克新 杜立飞 

机构地区：[1]Shaanxi Key Laboratory for Condensed Matter Structure and Properties, Northwestern Polytechnical University [2]The Key Laboratory of Space Applied Physics and Chemistry, Northwestern Polytechnical University

出　　处：《Chinese Physics B》2014年第3期566-571,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.61078057 and 51172183);the National Natural Science Foundation of Shaanxi Province,China(Grant No.2012JQ8013);the Aviation Foundation of China(Grant No.2011ZF53065);the NPU Foundation for Fundamental Research,China(Grant Nos.NPU-FFR-JC20110273 and JC201155)

摘　　要：In this paper, the morphological transition from dendrite to symmetry-broken dendrite is investigated in the directional ;olidification of non-axially-oriented crystals using a quantitative phase-field model. The effects of pulling velocity and zrystal orientation on the morphological transition are investigated. The results indicate the orientation dependence of the ;ymmetry-broken double dendrites. A dendrite to symmetry-broken dendrite transition is found by varying the pulling telocity at different crystal orientations and the symmetry-broken multiple dendrites emerge as a transition state for the ;ymmetry-broken double dendrites. The state region during the transition can be well characterized through the variations ff the characteristic angle and the average primary dendritic spacing.In this paper, the morphological transition from dendrite to symmetry-broken dendrite is investigated in the directional ;olidification of non-axially-oriented crystals using a quantitative phase-field model. The effects of pulling velocity and zrystal orientation on the morphological transition are investigated. The results indicate the orientation dependence of the ;ymmetry-broken double dendrites. A dendrite to symmetry-broken dendrite transition is found by varying the pulling telocity at different crystal orientations and the symmetry-broken multiple dendrites emerge as a transition state for the ;ymmetry-broken double dendrites. The state region during the transition can be well characterized through the variations ff the characteristic angle and the average primary dendritic spacing.

关 键 词：directional solidification phase-field simulations symmetry broken 

分 类 号：O73[理学—晶体学]