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Numéro
J. Phys. IV France
Volume 01, Numéro C4, Novembre 1991
EUROPEAN SYMPOSIUM ON MARTENSITIC TRANSFORMATION AND SHAPE MEMORY PROPERTIES
Page(s) C4-83 - C4-88
DOI http://dx.doi.org/10.1051/jp4:1991412
EUROPEAN SYMPOSIUM ON MARTENSITIC TRANSFORMATION AND SHAPE MEMORY PROPERTIES

J. Phys. IV France 01 (1991) C4-83-C4-88

DOI: 10.1051/jp4:1991412

ARE MARTENSITIC PHASE TRANSITIONS IN PURE GROUP 3 AND 4 METALS DRIVEN BY LATTICE VIBRATIONS ?

A. HEIMING1, W. PETRY1 and J. TRAMPENAU2

1  Institut Laue-Langevin, 156X, 38042 Grenoble cedex France
2  Institut für Metallforschung, Universität Münster, 4400 Münster, Germany


Abstract
The phonon dispersion in the high temperature bcc phase of the group 3 and 4 metals Sc, La, Ti, Zr and Hf have been determined by inelastic neutron scattering. In these pure elements the lattice vibrations are characterized by a valley of low energy modes, which are extremely damped, i.e. lifetimes as short as one vibrational period are measured. It is shown that these low energy vibrations exhibit a particular temperature behavior and are directly related to the transformation into the low temperature hcp or fcc phase or into the hexagonal [MATH]-phase under increasing pressure.



© EDP Sciences 1991