Jerky elasticity: Avalanches and the martensitic transition in Cu74.08Al23.13Be2.79 shape-memory alloy

Salje, Ekhard K. H.; Koppensteiner, Johannes; Reinecker, Marius; Schranz, Wilfried; Planes, Antoni
December 2009
Applied Physics Letters;12/7/2009, Vol. 95 Issue 23, p231908
Academic Journal
Jerky elasticity was observed by dynamical mechanical analyzer measurements in a single crystal of the shape memory alloy Cu74.08Al23.13Be2.79. Jerks appear as spikes in the dissipation of the elastic response function and relate to the formation of avalanches during the transformation between the austenite and the martensite phase. The statistics of the avalanches follows the predictions of avalanche criticality P(E)∝E-[variant_greek_epsilon] where P(E) is the probability of finding an avalanche with the energy E. This result reproduces, within experimental uncertainties, previous findings by acoustic emission techniques.


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