Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/9770
Title: Martensitic transformation of Cu-based shape-memory alloys: Elastic anisotropy and entropy change
Author: Planes Vila, Antoni
Mañosa, Lluís
Ríos-Jara, David
Ortín, Jordi, 1959-
Keywords: Transformacions martensítiques
Diagrames de fase
Propietats mecàniques
Aliatges
Martensitic transformations
Phase diagrams
Mechanical properties
Alloys
Issue Date: 1992
Publisher: The American Physical Society
Abstract: We have studied the martensitic transformation in a family of Cu-Al-Be crystals: We have measured the entropy change of the transition using a high-sensitivity calorimeter, and the elastic anisotropy of the high-temperature phase as a function of temperature by an ultrasonic method. Both entropy change and elastic anisotropy at the transition temperature are shown to be independent of the alloy composition. On the other hand, the vibrational entropy change and the elastic anisotropy have been theoreticallay related by an expression containing the fraction of low-energy modes. This relation has been specified for two different situations: (i) The region of soft modes is limited to wave vectors very close to the [ξξ0] direction in the reciprocal space and (ii) the region of soft modes is allowed to spread up to wave vectors with directions differing substantially from [ξξ0]. Our experimental results and other results for other families of Cu-based alloys are consistent with the two relations, suggesting a small (or at least composition independent) electronic contribution to the total entropy change.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.45.7633
It is part of: Physical Review B, 1992, vol. 45, núm. 14, p. 7633-7639.
Related resource: http://dx.doi.org/10.1103/PhysRevB.45.7633
URI: http://hdl.handle.net/2445/9770
ISSN: 0163-1829
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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