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Title: Superelasticity and cryogenic linear shape memory effects of CaFe2As2

Journal Article · · Nature Communications
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  1. Univ. of Connet. Dept. of Materials Science and Engineering, Inst. of Materials Science
  2. Drexel Univ., Philadelphia, PA (United States). Dept. of Mechanical Engineering and Mechanics
  3. Iowa State Univ., Ames, IA (United States). Ames Lab., Dept. of Physics and Astronomy
  4. Drexel Univ., Philadelphia, PA (United States). Dept. of Mechanical Engineering and Mechanics; Colorado State Univ., Fort Collins, CO (United States). Dept. of Mechanical Engineering

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. But, their performance is often limited by the energetics and geometry of the martensitic-austenitic phase transformation. 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. These 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.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1407487
Report Number(s):
IS-J 9415; PII: 1275
Journal Information:
Nature Communications, Vol. 8, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 18 works
Citation information provided by
Web of Science

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Cited By (6)

New materials physics journal November 2019
Ultrahigh elastically compressible and strain-engineerable intermetallic compounds under uniaxial mechanical loading journal June 2019
Trends in pressure-induced layer-selective half-collapsed tetragonal phases in the iron-based superconductor family A e A Fe 4 As 4 journal August 2018
Ultrahigh Elastically Compressible and Strain-Engineerable Intermetallic Compounds Under Uniaxial Mechanical Loading preprint January 2019
Two types of magnetic shape-memory effects from twinned microstructure and magneto-structural coupling in Fe 1+ y Te journal August 2019
A Nanoindentation Study of the Plastic Deformation and Fracture Mechanisms in Single-Crystalline CaFe2As2 journal April 2018

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