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The Martensitic Transformation and Extra Reflections Appearing Prior to the Transformation in AuCd Alloy

Published online by Cambridge University Press:  10 February 2011

T. Ohba  and
K. Otsuka
T. Ohba
Affiliation:
Department of Materials Science and Engineering, Teikyo University, Toyosatodai, Utsunomiya 320, Japan, ohba@koala.mse.teikyo-u.ac.jp
K. Otsuka
Affiliation:
Institute of Materials Science, University of Tsukuba, Tsukuba 305, Japan
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Abstract

AuCd alloy is a typical martensitic alloy. The crystal structural of the ζ2' (trogonal) martensite was recently determined and the analysis indicated the possibility of phonon softening. Despite a large absorption coefficient of Cd phonon softening was actually observed by using an isotope 114Cd. In the present study, precise x-ray scattering studies were performed with a rotating anode x-ray source and synchrotron radiation at Photon Factory in KEK, using small crystals. The structure factors of the parent phase and the diffraction profiles along <110> direction were measured with four circle diffractometers. The structure factors decrease when approaching the transformation temperature. Superstructure reflections were observed prior to the onset of the transformation. They are very weak and rather sharp and appear at q = (1/3,1/3,0) within the experimental error, i. e. at the commensurate position.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 459: Symposium Y – Materials for Smart Systems II , 1996 , 295
Copyright
Copyright © Materials Research Society 1997

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