Skip to main content
Article
Superelasticity and cryogenic linear shape memory effects of CaFe2As2
Ames Laboratory Accepted Manuscripts
  • John T. Sypek, University of Connecticut
  • Hang Yu, Drexel University
  • Keith J. Dusoe, Drexel University
  • Gil Drachuck, Iowa State University and Ames Laboratory
  • Hetal Patel, University of Connecticut
  • Amanda M. Giroux, University of Connecticut
  • Alan I. Goldman, Iowa State University and Ames Laboratory
  • Andreas Kreyssig, Iowa State University and Ames Laboratory
  • Paul C. Canfield, Iowa State University and Ames Laboratory
  • Serguei L. Bud’ko, Iowa State University and Ames Laboratory
  • Christopher R. Weinberger, Drexel University
  • Seok-Woo Lee, University of Connecticut
Publication Date
10-20-2017
Department
Physics and Astronomy; Ames Laboratory
Report Number
IS-J 9415
DOI
10.1038/s41467-017-01275-z
Journal Title
Nature Communications
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.

Language
en
Publisher
Iowa State University Digital Repository, Ames IA (United States)
Citation Information
John T. Sypek, Hang Yu, Keith J. Dusoe, Gil Drachuck, et al.. "Superelasticity and cryogenic linear shape memory effects of CaFe2As2" Vol. 8 (2017) p. 1083
Available at: http://works.bepress.com/paul_canfield/114/