Multiscale energy analysis of phase change localization in monocrystalline shape memory alloys

1. Topic The present work deals with solid-solid phase change and is founded on the global and local construction of energy balance during load-unload cycles. Such a construction requires information derived from infrared thermography (IRT) and digital image correlation (DIC). During cyclic tensile tests, the energy fields associated with a CuAlBe single crystal allowed the propagating bands of phase change front to be exhibited. The heat involved in the transformation was essentially made of latent heat of phase change, the mechanical energy dissipation remaining of low intensity. A 3D modeling was then proposed in the framework of the generalized standard material formalism in which the phase change appears as an anisothermal coupling mechanism accompanied by a low intrinsic dissipation. The good qualitative agreement between experiments and simulations legitimated the physical interpretation proposed for the phase change.