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Modeling of coupled motion and growth interaction of equiaxed dendritic crystals in a binary alloy during solidification
Qi, Xin Bo; Chen, Yun; Kang, Xiu Hong; Li, Dian Zhong; Gong, Tong Zhao; Chen, Y (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China.
2017-03-31
Source PublicationSCIENTIFIC REPORTS
ISSN2045-2322
Volume7Pages:-
AbstractMotion of growing dendrites is a common phenomenon during solidification but often neglected in numerical simulations because of the complicate underlying multiphysics. Here a phase-field model incorporating dendrite-melt two-phase flow is proposed for simulating the dynamically interacted process. The proposed model circumvents complexity to resolve dendritic growth, natural convection and solid motion simultaneously. Simulations are performed for single and multiple dendritic growth of an Al-based alloy in a gravity environment. Computing results of an isolated dendrite settling down in the convective supersaturated melt shows that solid motion is able to overwhelm solutal convection and causes a rather different growth morphology from the stationary dendrite that considers natural convection alone. The simulated tip growth dynamics are correlated with a modified boundary layer model in the presence of melt flow, which well accounts for the variation of tip velocity with flow direction. Polycrystalline simulations reveal that the motion of dendrites accelerates the occurrence of growth impingement which causes the behaviors of multiple dendrites are distinct from that of single dendrite, including growth dynamics, morphology evolution and movement path. These polycrystalline simulations provide a primary understanding of the sedimentation of crystals and resulting chemical homogeneity in industrial ingots.; Motion of growing dendrites is a common phenomenon during solidification but often neglected in numerical simulations because of the complicate underlying multiphysics. Here a phase-field model incorporating dendrite-melt two-phase flow is proposed for simulating the dynamically interacted process. The proposed model circumvents complexity to resolve dendritic growth, natural convection and solid motion simultaneously. Simulations are performed for single and multiple dendritic growth of an Al-based alloy in a gravity environment. Computing results of an isolated dendrite settling down in the convective supersaturated melt shows that solid motion is able to overwhelm solutal convection and causes a rather different growth morphology from the stationary dendrite that considers natural convection alone. The simulated tip growth dynamics are correlated with a modified boundary layer model in the presence of melt flow, which well accounts for the variation of tip velocity with flow direction. Polycrystalline simulations reveal that the motion of dendrites accelerates the occurrence of growth impingement which causes the behaviors of multiple dendrites are distinct from that of single dendrite, including growth dynamics, morphology evolution and movement path. These polycrystalline simulations provide a primary understanding of the sedimentation of crystals and resulting chemical homogeneity in industrial ingots.
description.department[qi, xin bo ; chen, yun ; kang, xiu hong ; li, dian zhong ; gong, tong zhao] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, liaoning, peoples r china
Subject AreaMultidisciplinary Sciences
Funding OrganizationNational Natural Science Foundation for Young Scientists of China [51401223]; National Natural Science Foundation of China [51271184, U1508215]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/78218
Collection中国科学院金属研究所
Corresponding AuthorChen, Y (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China.
Recommended Citation
GB/T 7714
Qi, Xin Bo,Chen, Yun,Kang, Xiu Hong,et al. Modeling of coupled motion and growth interaction of equiaxed dendritic crystals in a binary alloy during solidification[J]. SCIENTIFIC REPORTS,2017,7:-.
APA Qi, Xin Bo,Chen, Yun,Kang, Xiu Hong,Li, Dian Zhong,Gong, Tong Zhao,&Chen, Y .(2017).Modeling of coupled motion and growth interaction of equiaxed dendritic crystals in a binary alloy during solidification.SCIENTIFIC REPORTS,7,-.
MLA Qi, Xin Bo,et al."Modeling of coupled motion and growth interaction of equiaxed dendritic crystals in a binary alloy during solidification".SCIENTIFIC REPORTS 7(2017):-.
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