Multi-phase field simulation of competitive grain growth for directional solidification

doi:10.1088/1674-1056/ac4486

	Multi-phase field simulation of competitive grain growth for directional solidification
	Zhu, Chang-Sheng 2,3; Gao, Zi-Hao 3; Lei, Peng 1; Feng, Li 2; Zhao, Bo-Rui 3
刊名	CHINESE PHYSICS B
	2022-06-01
卷号	31 期号:6
关键词	multi-phase field model directional solidification grain competition growth grain boundary orientation
ISSN号	1674-1056
DOI	10.1088/1674-1056/ac4486
英文摘要	The multi-phase field model of grain competitive growth during directional solidification of alloy is established. Solving multi-phase field models for thin interface layer thickness conditions, the grain boundary evolution and grain elimination during the competitive growth of SCN-0.24-wt% camphor model alloy bi-crystals are investigated. The effects of different crystal orientations and pulling velocities on grain boundary microstructure evolution are quantitatively analyzed. The obtained results are shown below. In the competitive growth of convergent bi-crystals, when favorably oriented dendrites are in the same direction as the heat flow and the pulling speed is too large, the orientation angle of the bi-crystal from small to large size is the normal elimination phenomenon of the favorably oriented dendrite, blocking the unfavorably oriented dendrite, and the grain boundary is along the growth direction of the favorably oriented dendrite. When the pulling speed becomes small, the grain boundary shows the anomalous elimination phenomenon of the unfavorably oriented dendrite, eliminating the favorably oriented dendrite. In the process of competitive growth of divergent bi-crystal, when the growth direction of favorably oriented dendrites is the same as the heat flow direction and the orientation angle of unfavorably oriented grains is small, the frequency of new spindles of favorably oriented grains is significantly higher than that of unfavorably oriented grains, and as the orientation angle of unfavorably oriented dendrites becomes larger, the unfavorably oriented grains are more likely to have stable secondary dendritic arms, which in turn develop new primary dendritic arms to occupy the liquid phase grain boundary space, but the grain boundary direction is still parallel to favorably oriented dendrites. In addition, the tertiary dendritic arms on the developed secondary dendritic arms may also be blocked by the surrounding lateral branches from further developing into nascent main axes, this blocking of the tertiary dendritic arms has a random nature, which can have aninfluence on the generation of nascent primary main axes in the grain boundaries.
WOS研究方向	Physics
语种	英语
出版者	IOP Publishing Ltd
WOS记录号	WOS:000813319800001
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/158854]
专题	计算机与通信学院材料科学与工程学院
作者单位	1.Lanzhou Univ Technol, Network & Informat Ctr, Lanzhou 730050, Peoples R China 2.Lanzhou Univ Technol, State Key Lab Gansu Adv Proc & Recycling Nonferro, Lanzhou 730050, Peoples R China; 3.Lanzhou Univ Technol, Coll Comp & Commun, Lanzhou 730050, Peoples R China;
推荐引用方式 GB/T 7714	Zhu, Chang-Sheng,Gao, Zi-Hao,Lei, Peng,et al. Multi-phase field simulation of competitive grain growth for directional solidification[J]. CHINESE PHYSICS B,2022,31(6).
APA	Zhu, Chang-Sheng,Gao, Zi-Hao,Lei, Peng,Feng, Li,&Zhao, Bo-Rui.(2022).Multi-phase field simulation of competitive grain growth for directional solidification.CHINESE PHYSICS B,31(6).
MLA	Zhu, Chang-Sheng,et al."Multi-phase field simulation of competitive grain growth for directional solidification".CHINESE PHYSICS B 31.6(2022).