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Grain Refinement in Undercooled Metals

Published online by Cambridge University Press:  10 February 2011

J. Z. Xiao ,
H. Yang  and
H. W. Kui
J. Z. Xiao
Affiliation:
Permanent address: Department of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, China
H. Yang
Affiliation:
Physics Department, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong
H. W. Kui
Affiliation:
Physics Department, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong
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Abstract

Recently, it was demonstrated that grain refinement in metals can take place through two mechanisms, namely, dynamic nucleation and remelting of initially formed dendrites. In this study, it was found that Ni99.45B0.55 undergoes grain refinement, both by dynamic nucleation or by remelting, depending on the initial bulk undercooling just before crystallization. The nature of the grain refinement process is confirmed by microstructural analysis of the undercooled specimens.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 481: Symposium P – Science and Technology of Semiconductor Surface Preparation , 1997 , 15
Copyright
Copyright © Materials Research Society 1998

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References

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