Superelasticity and cryogenic linear shape memory effects of CaFe2As2

John T. Sypek, Hang Yu, Keith J. Dusoe, Gil Drachuck, Hetal Patel, Amanda M. Giroux, Alan I. Goldman, Andreas Kreyssig, Paul C. Canfield, Sergey L. Bud’ko, Christopher R. Weinberger and Seok-Woo Lee ()
Additional contact information
John T. Sypek: University of Connecticut
Hang Yu: Drexel University
Keith J. Dusoe: University of Connecticut
Gil Drachuck: Iowa State University
Hetal Patel: University of Connecticut
Amanda M. Giroux: University of Connecticut
Alan I. Goldman: Iowa State University
Andreas Kreyssig: Iowa State University
Paul C. Canfield: Iowa State University
Sergey L. Bud’ko: Iowa State University
Christopher R. Weinberger: Drexel University
Seok-Woo Lee: University of Connecticut

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: 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 the possibility of developing cryogenic linear actuation technologies with a high precision and high actuation power per unit volume for deep space exploration, and more broadly, suggest a mechanistic path to a class of shape memory materials, ThCr2Si2-structured intermetallic compounds.

Date: 2017
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DOI: 10.1038/s41467-017-01275-z

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