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Phase Transformations on Aging Cu-Al-Ni β Phase Alloys

Published online by Cambridge University Press:  21 February 2011

S. W. Husain ,
P. C. Clapp  and
M. Ahmed
S. W. Husain
Affiliation:
Department of Metallurgy University of Connecticut, Storrs, CT 06268, USA
P. C. Clapp
Affiliation:
Department of Metallurgy University of Connecticut, Storrs, CT 06268, USA
M. Ahmed
Affiliation:
Department of Metallurgy University of Connecticut, Storrs, CT 06268, USA
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Abstract

The phase transformations occurring on quenching and subsequent aging of a Cu-Al-Ni β phase alloy have been studied using transmission electron microscopy, x-ray diffraction and optical microscopy. Quenching produces an ordered solid solution, β1, based on the DO3 structure of Cu3A1. X-ray and electron diffraction show satellite diffraction peaks. On aging, these satellite peaks disappear and the parent phase undergoes a martensitic transformation. It is suggested that the parent phase undergoes a process of phase separation through the mechanism of spinodal decomposition before the martensitic transformation occurs. The martensitic transformation shows isothermal kinetics for which a transformation diagram is presented. Prolonged aging results in the formation of equilibrium phases.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 21: Symposium GREECE – Phase Transformations in Solids , 1983 , 729
Copyright
Copyright © Materials Research Society 1984

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References

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