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Precursor Phenomenon of Martensitic Transformation in Au-49.5at%Cd Alloy

Published online by Cambridge University Press:  22 February 2011

Takuya Ohba ,
S.M. Shapiro ,
Shingo Aoki  and
Kazuhiro Otsuka
Takuya Ohba
Affiliation:
Department of Materials Science and Engineering, Teikyo University, Toyosatodai, Utsunomiya 320,Japan
S.M. Shapiro
Affiliation:
Brookhaven National Laboratory, Upton, New York, 11973, USA
Shingo Aoki
Affiliation:
Institute of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305, Japan
Kazuhiro Otsuka
Affiliation:
Institute of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305, Japan
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Abstract

Phonon softening was observed in the parent phase of a AuCd alloy which transforms from the β2(B2) parent to ζ2¹(trigonal) martensite. Since Cd strongly absorbs neutrons, the isotope 114Cd was used in preparing the single crystal for the measurements. The [ζζ0]TA2 phonon branch was measured and found to be anomalously low. A minimum is present at ζ=0.35 which softens with decreasing temperature towards Ms. The results are consistent with the model proposed by Ohba et al. based upon a crystallographic study of the ζ2¹ phase.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 376: Symposium BB – Neutron Scattering in Materials Science , 1994 , 701
Copyright
Copyright © Materials Research Society 1995

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References

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