Power law statistics of avalanches in martensitic transformation

Physics – Condensed Matter – Materials Science

Scientific paper

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4 pages, 4 Postscript figures, to be published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.86.4076

We devise a two dimensional model that mimics the recently observed power law distributions for the amplitudes and durations of the acoustic emission signals observed during martensitic transformation [ Vives {\it et al}, Phys. Rev. Lett. {\bf 72}, 1694 (1994)]. We include a threshold mechanism arising from the athermal nature of transformation, long-range interaction between the transformed domains, inertial effects, and dissipation arising due to the motion of the interface. The model exhibits thermal hysteresis of the transformation, and more importantly, it shows that the energy is released in the form of avalanches with power law distributions for their amplitudes and durations. Computer simulations also reveal morphological features similar to those observed in real systems.

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