Uniaxial compression of [001]-oriented CaFe2As2 single crystals:the effects of microstructure and temperature on superelasticity Part I: Experimental observations

Sypek, John T.; Vijayan, Sriram; Bakst, Ian; Xiao, Shuyang; Kramer, Matthew J.; Canfield, Paul C.; Aindow, Mark; Weinberger, Christopher R.; Lee, Seok-Woo

doi:10.1016/j.actamat.2020.11.006

Uniaxial compression of [001]-oriented CaFe₂As₂ single crystals:the effects of microstructure and temperature on superelasticity Part I: Experimental observations

Journal Article · Thu Nov 05 23:00:00 EST 2020 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2020.11.006· OSTI ID:1722883

Sypek, John T. ^[1]; ^[1]; ^[2]; Xiao, Shuyang ^[1]; Kramer, Matthew J. ^[3]; Canfield, Paul C. ^[3]; ^[1]; Weinberger, Christopher R. ^[2]; ^[1]

Univ. of Connecticut, Storrs, CT (United States)
Colorado State Univ., Fort Collins, CO (United States)
Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)

Micropillar compression experiments on [001]-oriented CaFe₂As₂ single crystals have recently revealed the existence of superelasticity with a remarkably high elastic limit of over 10%. The collapsed tetragonal phase transition, which is a uni-axial contraction process in which As-As bonds are formed across an intervening Ca-plane, is the main mechanism of superelasticity. Usually, superelasticity and the related structural transitions are affected strongly by both the microstructure and the temperature. As such, in this study, we investigated how the microstructure and temperature affect the superelasticity of [001]-oriented CaFe₂As₂ micropillars cut from solution-grown single crystals, by performing a combination of in-situ cryogenic micromechanical testing and transmission electron microscopy studies. Our results show that the microstructure of CaFe₂As₂ is influenced strongly by the crystal growth conditions and by subsequent heat treatment. The presence of Ca and As vacancies and FeAs nanoprecipitates affect the mechanical behavior significantly. In addition, the onset stress for the collapsed tetragonal transition decreases gradually as the temperature decreases. These experimental results are discussed primarily in terms of the formation of As-As bonds, which is the essential feature of this mechanism for superelasticity. Our research outcomes provide a more fundamental understanding of the superelasticity exhibited by CaFe₂As₂ under uni-axial compression.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States); Iowa State Univ., Ames, IA (United States)

Sponsoring Organization:: National Aeronautics and Space Administration (NASA); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1722883

Alternate ID(s):: OSTI ID: 1780074

Report Number(s):: IS--J-10,368

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Vol. 203; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Uniaxial compression of [001]-oriented CaFe2As2 single crystals:the effects of microstructure and temperature on superelasticity Part I: Experimental observations

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Uniaxial compression of [001]-oriented CaFe₂As₂ single crystals:the effects of microstructure and temperature on superelasticity Part I: Experimental observations