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Third order elastic constants of bcc Cu-Al-Ni
Gonzàlez Comas, Alfons; Mañosa, Lluís
Universitat de Barcelona
We have measured the changes in the ultrasonic wave velocity, induced by the application of uniaxial stresses in a Cu-Al-Ni single crystal. From these measurements, the complete set of third-order elastic constants has been obtained. The comparison of results for Cu-Al-Ni with available data for other Cu-based alloys has shown that all these alloys exhibit similar anharmonic behavior. By using the measured elastic constants in a Landau expansion for elastic phase transitions, we have been able to give an estimation of the value of a fourth-order elastic constants combination. The experiments have also shown that the application of a stress in the [001] direction, reduces the material resistance to a (110)[110] shear and thus favors the martensitic transition.
04-05-2010
Aliatges
Transformacions martensítiques
Alloys
Martensitic transformations
(c) The American Physical Society, 1996
Artículo
The American Physical Society
         

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