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Title: High-pressure ultrasonic study of vibrational anharmonicity in bcc Cu-Al-Be alloys
Author: Jurado Cardelús, Mariàngels
Cankurtaran, M.
Mañosa, Lluís
Saunders, G. A.
Keywords: Transformacions martensítiques
Martensitic transformations
Issue Date: 1992
Publisher: The American Physical Society
Abstract: To quantify the vibrational anharmonicity of the long-wavelength acoustic modes of bcc Cu74.1Al23.1Be2.8 near its martensitic transition temperature Ms (261 K), the hydrostatic pressure derivatives (¿CIJ/¿P)P=0 of the elastic stiffness moduli have been measured. The Grüneisen parameters at 268 K (just above Ms), especially of longitudinal modes, which become smaller than those of the shear modes, are quite different from those at 295 K: the anharmonicity changes markedly in the vicinity of the transition. Similar trends are noted for Cu66.5Al12.7Zn20.8. Experimental data near Ms are used to estimate cubic invariants in the strain order parameters in a Landau formalism.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i
It is part of: Physical Review B, 1992, vol. 46, núm. 21, p. 14174-14177.
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ISSN: 0163-1829
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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