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Article

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Published version

Publication date

1992

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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/9905

High-pressure ultrasonic study of vibrational anharmonicity in bcc Cu-Al-Be alloys

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http://dx.doi.org/10.1103/PhysRevB.46.14174

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.

Subject

Transformacions martensítiques, Aliatges

Subject (English)

Martensitic transformations, Alloys

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Articles publicats en revistes (Física Quàntica i Astrofísica)

Citation

JURADO CARDELÚS, Mariàngels, et al. High-pressure ultrasonic study of vibrational anharmonicity in bcc Cu-Al-Be alloys. Physical Review B. 1992. Vol. 46, num. 21, pags. 14174-14177. ISSN 0163-1829. [consulted: 8 of June of 2026]. Available at: https://hdl.handle.net/2445/9905

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