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The Effects of a New Grain Boundary Phase in Ni-Al Alloy

Published online by Cambridge University Press:  21 March 2011

Y.L. Chiu ,
A.H.W. Ngan  and
I.P. Jones
Y.L. Chiu
Affiliation:
Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, P.R.China
A.H.W. Ngan
Affiliation:
Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, P.R.China
I.P. Jones
Affiliation:
School of Metallurgy and Materials, University of Birmingham, Edgbaston, B15 2TT, England
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Abstract

In a γ/γ' nickel-aluminum alloy, a new phase has been identified along grain boundaries by conventional transmission electron microscopy. This phase is identified to be of the C6Cr23 type structure with lattice parameter 10.48Å, which is approximately three times that of Ni 3Al or nickel. This grain boundary precipitate is found to be coherent with the γ' phase in one grain. The chemical composition of this grain boundary precipitate is determined by energy dispersive x-ray spectroscopy and parallel electron energy loss spectroscopy. The deformation mechanism of this grain boundary precipitate is investigated on post-mortem specimens which have been carefully deformed by nanoindentation after jet-polishing.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 652: Symposium Y – Influences of Interface & Dislocation Behavior on Microstructure Evolution , 2000 , Y8.13
Copyright
Copyright © Materials Research Society 2001

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References

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