Nonequilibrium analysis of high gradient absolute stability during unidirectional solidification

Guolu Ding; Xin Lin; Weidong Huang; Yaohe Zhou

doi:10.1016/S0025-5408(97)00010-X

Nonequilibrium analysis of high gradient absolute stability during unidirectional solidification

Guolu Ding, Xin Lin, Weidong Huang, Yaohe Zhou

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

Further analysis of the M-S interface stability theory predicts a new phenomenon, the high gradient absolute stability (HGAS); that is, when temperature gradient exceeds a critical value, the solidification interface becomes absolutely stable no matter how large solidification velocity is. The critical temperature gradient for HGAS is explicitly evaluated by incorporating mathematical deduction with numerical calculation. The critical conditions for HGAS of several typical alloys are modified by inserting a velocity-dependent partition coefficient and a velocity-dependent slope of the "kinetic liquidus" into the HGAS analysis. These nonequilibrium interface kinetic effects decrease the predicted critical temperature gradient for HGAS.

Original language	English
Pages (from-to)	669-677
Number of pages	9
Journal	Materials Research Bulletin
Volume	32
Issue number	6
DOIs	https://doi.org/10.1016/S0025-5408(97)00010-X
State	Published - Jun 1997

Keywords

A. alloys
A. interfaces
A. metals
B. crystal growth

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10.1016/S0025-5408(97)00010-X

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title = "Nonequilibrium analysis of high gradient absolute stability during unidirectional solidification",

abstract = "Further analysis of the M-S interface stability theory predicts a new phenomenon, the high gradient absolute stability (HGAS); that is, when temperature gradient exceeds a critical value, the solidification interface becomes absolutely stable no matter how large solidification velocity is. The critical temperature gradient for HGAS is explicitly evaluated by incorporating mathematical deduction with numerical calculation. The critical conditions for HGAS of several typical alloys are modified by inserting a velocity-dependent partition coefficient and a velocity-dependent slope of the {"}kinetic liquidus{"} into the HGAS analysis. These nonequilibrium interface kinetic effects decrease the predicted critical temperature gradient for HGAS.",

keywords = "A. alloys, A. interfaces, A. metals, B. crystal growth",

author = "Guolu Ding and Xin Lin and Weidong Huang and Yaohe Zhou",

year = "1997",

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T1 - Nonequilibrium analysis of high gradient absolute stability during unidirectional solidification

AU - Ding, Guolu

AU - Lin, Xin

AU - Huang, Weidong

AU - Zhou, Yaohe

PY - 1997/6

Y1 - 1997/6

N2 - Further analysis of the M-S interface stability theory predicts a new phenomenon, the high gradient absolute stability (HGAS); that is, when temperature gradient exceeds a critical value, the solidification interface becomes absolutely stable no matter how large solidification velocity is. The critical temperature gradient for HGAS is explicitly evaluated by incorporating mathematical deduction with numerical calculation. The critical conditions for HGAS of several typical alloys are modified by inserting a velocity-dependent partition coefficient and a velocity-dependent slope of the "kinetic liquidus" into the HGAS analysis. These nonequilibrium interface kinetic effects decrease the predicted critical temperature gradient for HGAS.

AB - Further analysis of the M-S interface stability theory predicts a new phenomenon, the high gradient absolute stability (HGAS); that is, when temperature gradient exceeds a critical value, the solidification interface becomes absolutely stable no matter how large solidification velocity is. The critical temperature gradient for HGAS is explicitly evaluated by incorporating mathematical deduction with numerical calculation. The critical conditions for HGAS of several typical alloys are modified by inserting a velocity-dependent partition coefficient and a velocity-dependent slope of the "kinetic liquidus" into the HGAS analysis. These nonequilibrium interface kinetic effects decrease the predicted critical temperature gradient for HGAS.

KW - A. alloys

KW - A. interfaces

KW - A. metals

KW - B. crystal growth

UR - http://www.scopus.com/inward/record.url?scp=0031162983&partnerID=8YFLogxK

U2 - 10.1016/S0025-5408(97)00010-X

DO - 10.1016/S0025-5408(97)00010-X

M3 - 文章

AN - SCOPUS:0031162983

SN - 0025-5408

VL - 32

SP - 669

EP - 677

JO - Materials Research Bulletin

JF - Materials Research Bulletin

IS - 6

ER -

Nonequilibrium analysis of high gradient absolute stability during unidirectional solidification

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Keywords

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