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Vibrational behaviour of bcc Cu-based shape memory alloys close to the martensitic transition
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Experimental data from ultrasonic and inelastic neutron scattering measurements are analyzed for different families of Cu-based shape-memory alloys. It is shown that the transition occurs at a value, independent of composition and alloy family, of the ratio between the elastic constants associated with the two shears necessary to accomplish the lattice distortion from the bcc to the close-packed structure. The zone boundary frequency of the TA2[110] branch evaluated at the transition point (TM), weakly depends, for each family, on composition. A linear relationship between this frequency and the inverse of the elastic constant C', both quantities evaluated at TM, has been found, in agreement with the prediction of a Landau model proposed for martensitic transformations.
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PLANES VILA, Antoni, MAÑOSA, Lluís and VIVES I SANTA-EULÀLIA, Eduard. Vibrational behaviour of bcc Cu-based shape memory alloys close to the martensitic transition. Physical Review B. 1996. Vol. 53, num. 6, pags. 3039-3046. ISSN 0163-1829. [consulted: 17 of August of 2026]. Available at: https://hdl.handle.net/2445/10450