Vibrational behavior of bcc Cu-based shape-memory alloys close to the martensitic transition

Article

关键词: STRUCTURAL PHASE-TRANSFORMATION;    NEUTRON-SCATTERING;    PREMARTENSITIC STATE;    ENTROPY CHANGE;    AL;    CU-ZN-A1;   

DOI  :  10.1103/PhysRevB.53.3039

来源: SCIE

【 摘 要 】

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 (T-M), 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 T-M, has been found, in agreement with the prediction of a Landau model proposed for martensitic transformations.

【 授权许可】

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