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Superelasticity and cryogenic linear shape memory effects of CaFe2As2

Author

Listed:
  • 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
    Colorado State University)

  • Seok-Woo Lee

    (University of Connecticut)

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.

Suggested Citation

  • 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 & Seok-W, 2017. "Superelasticity and cryogenic linear shape memory effects of CaFe2As2," Nature Communications, Nature, vol. 8(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_s41467-017-01275-z
    DOI: 10.1038/s41467-017-01275-z
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    Cited by:

    1. Xi Wang & Anirban Kundu & Bochao Xu & Sajna Hameed & Nadav Rothem & Shai Rabkin & Luka Rogić & Liam Thompson & Alexander McLeod & Martin Greven & Damjan Pelc & Ilya Sochnikov & Beena Kalisky & Avraham, 2024. "Multiferroicity in plastically deformed SrTiO3," Nature Communications, Nature, vol. 15(1), pages 1-10, December.

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