Revisiting dynamics and models of microsegregation during polycrystalline solidification of binary alloy

doi:10.1016/j.jmst.2020.09.038

IMR OpenIR

	Revisiting dynamics and models of microsegregation during polycrystalline solidification of binary alloy
	Gong, Tongzhao 1,2; Chen, Yun 1; Li, Shanshan 1,2; Cao, Yanfei 1; Li, Dianzhong 1; Chen, Xing-Qiu 1; Reinhart, Guillaume 3; Nguyen-Thi, Henri 3
通讯作者	Chen, Yun(chenyun@imr.ac.cn)
	2021-05-30
发表期刊	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN	1005-0302
卷号	74 页码:155-167
摘要	Microsegregation formed during solidification is of great importance to material properties. The conventional Lever rule and Scheil equation are widely used to predict solute segregation. However, these models always fail to predict the exact solute concentration at a high solid fraction because of theoretical assumptions. Here, the dynamics of microsegregation during polycrystalline solidification of refined Al-Cu alloy is studied via two- and three-dimensional quantitative phase-field simulations. Simulations with different grain refinement level, cooling rate, and solid diffusion coefficient demonstrate that solute segregation at the end of solidification (i.e. when the solid fraction is close to unit) is not strongly correlated to the grain morphology and back diffusion. These independences are in accordance with the Scheil equation which only relates to the solid fraction, but the model predicts a much higher liquid concentration than simulations. Accordingly, based on the quantitative phase-field simulations, a new analytical microsegregation model is derived. Unlike the Scheil equation or the Lever rule that respectively overestimates or underestimates the liquid concentration, the present model predicts the liquid concentration in a pretty good agreement with phase-field simulations, particularly at the late solidification stage. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
关键词	Microsegregation Grain refinement Cooling rate Back diffusion Phase-field method
资助者	Science Challenge Project ; Youth Innovation Promotion Association CAS ; Youth Talent program of Shenyang National Laboratory for Materials Science ; Special Scientific Projects of Inner Mongolia ; French National Space Center (CNES)
DOI	10.1016/j.jmst.2020.09.038
收录类别	SCI
语种	英语
资助项目	Science Challenge Project[TZ2016004] ; Youth Innovation Promotion Association CAS ; Youth Talent program of Shenyang National Laboratory for Materials Science[L2019F08] ; Special Scientific Projects of Inner Mongolia ; French National Space Center (CNES)[174800/00]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000636044000017
出版者	JOURNAL MATER SCI TECHNOL
引用统计	被引频次：18[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/162340
专题	中国科学院金属研究所
通讯作者	Chen, Yun
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China 3.Aix Marseille Univ, Univ Toulon, IM2NP, CNRS, Marseille, France
推荐引用方式 GB/T 7714	Gong, Tongzhao,Chen, Yun,Li, Shanshan,et al. Revisiting dynamics and models of microsegregation during polycrystalline solidification of binary alloy[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2021,74:155-167.
APA	Gong, Tongzhao.,Chen, Yun.,Li, Shanshan.,Cao, Yanfei.,Li, Dianzhong.,...&Nguyen-Thi, Henri.(2021).Revisiting dynamics and models of microsegregation during polycrystalline solidification of binary alloy.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,74,155-167.
MLA	Gong, Tongzhao,et al."Revisiting dynamics and models of microsegregation during polycrystalline solidification of binary alloy".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 74(2021):155-167.