摘要
将KKSO多相场模型扩展至三维,通过低层片厚度测试验证了模型建立和参数选择的正确性.利用KKSO三维多相场模型,在低厚度条件下研究了亚共晶、共晶及过共晶合金的三维形态演化.结果表明,三维形态演化与二维类似,当无量纲初始层片间距在0.598—2.336之间变化时,随着初始层片间距的增加,CBr_4-C_2Cl_6共晶合金形态演化的顺序为:层片淹没→稳态生长→层片振荡→层片分叉.由于三维多了第三方向的限制作用,其形态演化的临界值明显低于二维.
The KKSO multi-phase field model is extended to three dimensions（3D）.The modeling and the choice of parameters are confirmed to be correct by tests with low lamellar thickness.With the KKSO multi-phase field model,the morphology evolution of hypoeutectic,eutectic and hypereutectic CBr_4-C_2Cl_6 alloy is studied with low lamellar thickness.The simulated results showed that the morphology evolution in 3D is similar to that in two dimensions（2D）.With the increase of the dimensionless initial lamellar spacings∧in the range of 0.598—2.336,the sequence of morphology evolution is：lamellar merges→stable growth→lamellar oscillation→lamellar branching.But the critical value of morphology evolution in 3D is smaller than that in 2D due to effect of the third dimension.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2010年第7期781-786,共6页
Acta Metallurgica Sinica
基金
中国博士后基金项目20090460654
上海市科委项目0752nm004和08DZ2201300资助~~
关键词
三维多相场
低层片厚度
形态演化
three dimensional（3D）multi-phase field
low lamellar thickness
morphology evolution
