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Elastic Isotropy in Martensitically Transforming FCC Alloys

Published online by Cambridge University Press:  25 February 2011

J. Li ,
H.D. Chopra ,
L. Tanner  and
M. Wuttig
J. Li
Affiliation:
University of Maryland, College Park, MD 20742
H.D. Chopra
Affiliation:
University of Maryland, College Park, MD 20742
L. Tanner
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550
M. Wuttig
Affiliation:
University of Maryland, College Park, MD 20742
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Abstract

The nature of the premartensitic state is still under debate. It is becoming evident that alloys which transform into a long period polymorph display the equivalent precursor strain modulations in the parent phases. The situation in alloys which transform in the center of the BZ is less clear, however. On the basis of electron microscopic [1,2,3] and X-ray diffraction data [4], it has been proposed for Fe-Pd alloy that the parent state consists of a coherent mixture of tetragonally distorted variants which may form a transitional phase. The interpretation is substantially based on the observation of 110 diffuse scattering and the softening of the elastic constant ½(C11 -C12) [1,2,5,6,7]. We have performed TEM studies of In-Tl alloys and investigated the low frequency mechanical response of In-Tl, In-Cd and Fe-Pd alloys. The phase diagrams of the three alloys [8,9,10], schematically presented in Fig. 1, show the common FCC-FCT martensitic transformation. Our studies indicate isotropic "elastic" softening and show that 111 streaking is present as well. This paper presents the mechanical results and their preliminary interpretation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 246: Symposium M – Shape-Memory Materials and Phenomena--Fundamental Aspects and Applications , 1991 , 109
Copyright
Copyright © Materials Research Society 1992

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