The Effect of Natural Convection on Equiaxed Dendritic Growth: Quantitative Phase-Field Simulation and Comparison with Synchrotron X-Ray Radiography Monitoring Data

doi:10.1155/2016/5286168

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	The Effect of Natural Convection on Equiaxed Dendritic Growth: Quantitative Phase-Field Simulation and Comparison with Synchrotron X-Ray Radiography Monitoring Data
	Qi, Xin Bo; Chen, Yun; Kang, Xiu Hong; Li, Dian Zhong
刊名	ADVANCES IN MATERIALS SCIENCE AND ENGINEERING
	2016
页码	10
ISSN号	1687-8434
DOI	10.1155/2016/5286168
通讯作者	Chen, Yun(chenyun@imr.ac.cn)
英文摘要	A two-dimensional (2D) quantitative phase-field model solved by adaptive finite element method is employed to investigate the effect of natural convection on equiaxed dendritic growth of Al-4wt.% Cu alloy under continuous cooling condition. The simulated results are compared with diffusion-limited simulations as well as the experimental data obtained by means of in situ and realtime X-ray imaging technique. The results demonstrate that natural convection induced by solute gradients around the dendritic crystal has an obvious influence on the dendrite morphology and growth dynamics. Since the rejected solute cooper from solid is heavier than aluminum, it sinks down along the interface from the top arm tip to the bottom arm which results in the formation of a circulatory flow vortex on both sides of the dendrite. Hence, the convection promotes the top arm advancing into the melt progressively whereas it suppresses the growth of bottom severely. As the dendrite grows into a large size, the convection becomes more intense and the morphology shows distinguished asymmetric shape. When compared with experimental data, the growth velocity is found to agree substantially better with the simulation incorporating natural convection than the purely diffusive phase-field predictions.
资助项目	National Natural Science Foundation for Young Scientists of China[51401223] ; National Natural Science Foundation of China[51271184]
WOS研究方向	Materials Science
语种	英语
出版者	HINDAWI PUBLISHING CORP
WOS记录号	WOS:000385103600001
资助机构	National Natural Science Foundation for Young Scientists of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/123100]
专题	金属研究所_中国科学院金属研究所
通讯作者	Chen, Yun
作者单位	Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Qi, Xin Bo,Chen, Yun,Kang, Xiu Hong,et al. The Effect of Natural Convection on Equiaxed Dendritic Growth: Quantitative Phase-Field Simulation and Comparison with Synchrotron X-Ray Radiography Monitoring Data[J]. ADVANCES IN MATERIALS SCIENCE AND ENGINEERING,2016:10.
APA	Qi, Xin Bo,Chen, Yun,Kang, Xiu Hong,&Li, Dian Zhong.(2016).The Effect of Natural Convection on Equiaxed Dendritic Growth: Quantitative Phase-Field Simulation and Comparison with Synchrotron X-Ray Radiography Monitoring Data.ADVANCES IN MATERIALS SCIENCE AND ENGINEERING,10.
MLA	Qi, Xin Bo,et al."The Effect of Natural Convection on Equiaxed Dendritic Growth: Quantitative Phase-Field Simulation and Comparison with Synchrotron X-Ray Radiography Monitoring Data".ADVANCES IN MATERIALS SCIENCE AND ENGINEERING (2016):10.