Abstract
We study elastic anisotropy of a disordered Fe–Pd alloy under reversible elastic-like strains up to 4.3% by means of ultrasonic methods. The evolution of the full tetragonal tensor of elastic constants with a [001]-prestress ranging from 0 to 200 MPa is obtained, which enables an analysis of the change of the low-frequency limit of the soft-phonon structure. It is observed that while the anisotropy of the elastic moduli further increases, giving rise to an anomalous anisotropy factor of A > 50, the phonon branches stiffen. This means that, unlike for conventional shape memory alloys, the tetragonal crystal structure induced by the prestress is more stable than the stress-free cubic structure, although there is no other indication of the stress-induced transition.
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