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Published in: Journal of Materials Science 21/2021

03-05-2021 | Metals & corrosion

A phase-field study of the solidification process coupled with deformation

Authors: Jian-kun Ren, Yun Chen, Yan-fei Cao, Bin Xu, Ming-yue Sun, Dian-zhong Li

Published in: Journal of Materials Science | Issue 21/2021

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Abstract

Non-dendritic microstructures are generally obtained in metals after semi-solid deformation (deformation during solidification); however, dendritic growth is preferred without deformation. The fragmentation of dendrites is recognized as an essential contributing factor to non-dendritic microstructures. However, the underlying mechanism of fragmentation needs to be clarified in depth. It is infamously hard for researchers to carry out a direct observation of this process. Moreover, a comprehensive numerical survey of this process is not trivial. The present research reported a new method to model dendritic growth during semi-solid deformation. The motion and deformation of the solid coupled with liquid flow in the melt were treated as the two-phase flow because plastic materials could be formulated as non-Newtonian fluids. The vector-valued phase-field formulation and the self-constructed Navier–Stokes solver made it possible to simulate the growth, motion, deformation, fragmentation and agglomeration of two dendrites coupled with liquid flow in the melt. Computational results suggest that fragmentation can occur when the grain boundary is wet and penetrated by the melt, giving new supporting evidence to a previously proposed mechanism for the fragmentation of dendrites.

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Appendix
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Metadata
Title
A phase-field study of the solidification process coupled with deformation
Authors
Jian-kun Ren
Yun Chen
Yan-fei Cao
Bin Xu
Ming-yue Sun
Dian-zhong Li
Publication date
03-05-2021
Publisher
Springer US
Published in
Journal of Materials Science / Issue 21/2021
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-021-06026-6

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