Effects of crystallographic texture directionality on the compressive stress–strain response of shape recovered polycrystalline nitinol

Abstract

Nitinol derives its unique non-linear and anisotropic mechanical behavior from stress-induced martensite transformations, where the resulting strains are affected by the crystallographic orientation. It is clear that texture has a marked influence on mechanical and shape recovery properties and is the source that leads to tension–compression asymmetry. Crystallographic texture anisotropies when compressed in different crystallographic alignment directions and made to recover their shape through one-way shape memory effect show different recovery strains and strength levels.