Phase-field simulation of secondary dendrite growth in directional solidification of binary alloys

论文摘要

Phase field method was used to simulate the effect of grains orientation angle θ11 and azimuth θA of non-preferentially growing dendrites on the secondary dendrites of preferentially growing dendrites. In the simulation process, two single-factor influence experiments were designed for columnar crystal structures. The simulation results showed that, when θ11 < 45o and θA < 45o, as θ11 was enlarged, the growth direction of the secondary dendrites on the preferentially growing dendrites at the converging grain boundary（GB） presented an increasing inclination to that of preferentially growing dendrites; with increasing θA, the growth direction of the secondary dendrites on the preferentially growing dendrites at the converging GB exhibited greater deflection,and the secondary dendrites grew with branches; the secondary dendrites on the preferentially growing dendrites at diverging GBs grew along a direction vertical to the growth direction of the preferentially growing dendrites.When θA = 45o and θ11 = 45o, the secondary dendrites grew in a direction vertical to the growth direction of preferentially growing dendrites. The morphologies of the dendrites obtained through simulation can also be found in metallographs of practical solidification experiments. This implies that the effect of a grain’s orientation angle and azimuth of non-preferentially growing dendrites on the secondary dendrites of preferentially growing dendrites does exist and frequently appears in the practical solidification process.

论文目录

文章来源

类型: 期刊论文

作者: Li Feng,Ni-ni Lu,Ya-long Gao,Chang-sheng Zhu,Jun-he Zhong,Rong-zhen Xiao

来源: China Foundry 2019年02期

年度: 2019

分类: 工程科技Ⅰ辑

专业: 金属学及金属工艺

单位: College of Materials and Engineering, Lanzhou University of Technology,State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology

基金: supported by the National Natural Science Foundation of China(Grant Nos.:11504149,11364024,and 51661020)

分类号: TG244.3

页码: 97-104

总页数: 8

文件大小: 1499K

下载量: 30

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