Microscale investigation of phase transformation and plasticity in multi-crystalline shape memory alloy using discrete dislocation–transformation method

Abstract Martensitic phase transformation and plasticity are two primary mechanisms of deformation in shape memory alloys (SMAs) the interaction between them influences behaviour SMA during cyclic loading, specifically pseudoelasticity effect. This interaction, which occurs microscale, affects reversibility eventually actuation capacity SMAs. In order to capture this a discrete dislocation–transformation model was developed Sakhaei et al. (Mech Mater 97:1–18, 2016) applied simulate single-crystalline NiTi samples under thermo-mechanical loads. study, microscale coupling as well grain size orientation effects is investigated multi-crystalline thermal mechanical loading by using framework through representative numerical simulations. The results illustrated dependency dislocation slip martensitic crystalline orientations boundary densities