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The Influence of Structural Similarity on Phase Transformations Between Bcc and the Laves Compounds

Published online by Cambridge University Press:  21 February 2011

W. Sinkler
W. Sinkler*
Affiliation:
Institute for Materials Research, GKSS Forschungszentrum, 21502 Geesthacht, Germany, sinkler@dvibm3.gkss.de
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Abstract

A fundamental aspect of martensitic or order-disorder phase transformations is the maintainence of correspondences between atoms or atomic sites in parent and precipitate phases. The present work concerns a structural relationship between initial and final phases in a transformation which is neither martensitic nor order-disorder. A structural relationship between the C14 Laves compound structure and body-centered cubic (bcc) is presented based on electron diffraction recorded in the course of the electron irradiation-induced transformation of the TiCr2 Laves compound to the bcc (β) phase. The diffraction evidence indicates a preferential orientation of β with respect to the initial Laves phase. Consistent with the diffraction data, it is shown how the structures can be formed from one another via small displacements of atom positions. It is suggested that structural relationships in first-order transformations may be significant as paths of minimal structural rearrangement by which such transformations may occur.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 398: Symposium C – Thermodynamics and Kinetics of Phase Transformations , 1995 , 263
Copyright
Copyright © Materials Research Society 1998

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References

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