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Phonons at Martensitic Phase Transitions of bcc-Ti, bcc-Zr and bcc-Hf

Published online by Cambridge University Press:  21 February 2011

W. Petry ,
A. Heiming  and
J. Trampenaux
W. Petry
Affiliation:
Institut Laue-Langevin, 156X, 38042 Grenoble Cedex, France
A. Heiming
Affiliation:
Institut Laue-Langevin, 156X, 38042 Grenoble Cedex, France Freie Universität Berlin, Fachbereich Physik, D-1000 Berlin, FRG
J. Trampenaux
Affiliation:
Institut Laue-Langevin, 156X, 38042 Grenoble Cedex, France Institut für Metallforschung, Univ. MUnster, D-4400 Münster, FRG
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Abstract

Inelastic neutron scattering on in situ grown bcc single crystals of the group 4 metals Ti, Zr and Hf show a band of low energy and strongly damped phonons. Geometrical considerations show how these damped lattice vibrations achieve the displacements necessary for the two martensitic phase transitions from bcc to ω(under pressure) and from bcc to hcp (upon lowering the temperature). The low energy and temperature dependent phonons are precursor fluctuations of the hcp or ω phase within the bcc phase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 166: Symposium J – Neutron Scattering for Materials Science , 1989 , 161
Copyright
Copyright © Materials Research Society 1990

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