Title:
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High-pressure ultrasonic study of vibrational anharmonicity in bcc Cu-Al-Be alloys
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Author:
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Jurado Cardelús, Mariàngels; Cankurtaran, M.; Mañosa, Lluís; Saunders, G. A.
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Other authors:
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Universitat de Barcelona |
Abstract:
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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(s):
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-Transformacions martensítiques -Aliatges -Martensitic transformations -Alloys |
Rights:
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(c) The American Physical Society, 1992
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Document type:
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Article Article - Published version |
Published by:
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The American Physical Society
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