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Short-Range-Ordering and Fe-Clustering in Au-Fe Alloys

Published online by Cambridge University Press:  26 February 2011

Chen-Chia Chou ,
F.-R. Chen  and
C. M. Wayman
Chen-Chia Chou
Affiliation:
University of Illinois at Urbana-Champaign, Dept. of Materials Science and Engineering, Urbana, IL 61801
F.-R. Chen
Affiliation:
Northwestern University, Dept. of Materials Science and Engineering, Evanston, IL 60208
C. M. Wayman
Affiliation:
University of Illinois at Urbana-Champaign, Dept. of Materials Science and Engineering, Urbana, IL 61801
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Abstract

As an “archtypal” spin-glass system, the local atomic arrangement in Au-Fe alloys is still a controversial subject. In the present experiment, Au-Fe alloys with Fe content from 10.7 to 33% were studied as to microstructure evolution, through various transmission electron microscopic techniques. Information derived from aging experiments using real and reciprocal spaces appears to suggest the coexistence of short-range-order and Fe-clusters. At early stages of aging, lobe-like and/or rod-shaped strain contrast images, identified as clusters, were revealed after specimens were further cleaned by an ion-miller. The (1 1/2 0) special point diffuse reflections were prominent in the as-quenched condition and/or early stage aging, and the intensifies decrease gradually as aging proceeds. After a certain period, (1 1/2 0) diffuse reflections disappear but strain contrast images still remain similar. This suggests that the strain contrast images are not related to the (1 1/2 0) diffuse reflections. High resolution electron microscopy was also employed. The results are consistent with the arguments derived from aging experiments.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 205: Symposium F – Kinetics of Phase Transformations , 1990 , 131
Copyright
Copyright © Materials Research Society 1992

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