Superelasticity and cryogenic linear shape memory effects of CaFe₂As₂.

ABSTRACT: Shape memory materials have the ability to recover their original shape after a significant amount of deformation when they are subjected to certain stimuli, for instance, heat or magnetic fields. However, their performance is often limited by the energetics and geometry of the martensitic-austenitic phase transformation. Here, we report a unique shape memory behavior in CaFe₂As₂, which exhibits superelasticity with over 13% recoverable strain, over 3 GPa yield strength, repeatable stress-strain response even at the micrometer scale, and cryogenic linear shape memory effects near 50 K. These properties are acheived through a reversible uni-axial phase transformation mechanism, the tetragonal/orthorhombic-to-collapsed-tetragonal phase transformation. Our results offer

SUBMITTER: Sypek JT 

PROVIDER: S-EPMC5715139 | biostudies-literature | 2017 Oct

REPOSITORIES: biostudies-literature