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

摘要

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.