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Directional Coarsening of γ′ Phase Induced by Phase Transformation Stress

Published online by Cambridge University Press:  03 March 2011

K. Zhao ,
Y.H. Ma ,
L.H. Lou  and
Z.Q. Hu
K. Zhao*
Affiliation:
Institute of Metal Research, Graduate School of the Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
Y.H. Ma
Affiliation:
Institute of Metal Research, Graduate School of the Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
L.H. Lou
Affiliation:
Institute of Metal Research, Graduate School of the Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
Z.Q. Hu
Affiliation:
Institute of Metal Research, Graduate School of the Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
*
a) Address all correspondence to this author. e-mail: kzhao@imr.ac.cn
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Abstract

It was found that directional coarsening was induced by phase transformation stress due to non-uniform distribution of μ phase in an experimental nickel-based superalloy. The mechanism based on the existing diffusion and coherency strain energy theory has been discussed. It was concluded that directional coarsening was the course of dissolving of γ′ portion with high free energy, diffusing and growing on the existed γ′ particles along a preferential direction.

Keywords

AlloySecond phasesPhase transformation
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 9 , September 2005 , pp. 2314 - 2321
Copyright
Copyright © Materials Research Society 2005

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