Recent Advances in Micromechanics of Materials Recent advances in spatiotemporal evolution of thermomechanical fields during the solid-solid phase transition

Article history: This article reports recent advances in the micromechanics experimental research of the solid-solid phase transition in NiTi shape memory alloys. In the first part, we show how an initially macroscopic homogeneous material state becomes unstable and transforms into a new phase under external driving, leading to the emergence of macroscopic spatial periodic self-organized domain patterns and their loading rate dependence. In the second part, we report the phenomenon of temperature and stress oscillations under cyclic phase transition. We elucidate the multi-physical and multi-scaled nature of the spatiotemporal evolution of thermomechanical fields and emphasize and examine the important role of time scales and thermomechanical coupling in the response of the material.