Pseudoelasticity of SrNi2P2 Micropillar via Double Lattice Collapse and Expansion

Date
2021-10-13
Authors
Xiao, Shuyang
Borisov, Vladislav
Gorgen-Lesseux, Guilherme
Rommel, Sarshad
Song, Gyuho
Maita, Jessica M.
Aindow, Mark
Valentí, Roser
Canfield, Paul
Lee, Seok-Woo
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American Chemical Society
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Physics and Astronomy
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Ames Laboratory
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Physics and AstronomyAmes Laboratory
Abstract
The maximum recoverable strain of most crystalline solids is less than 1% because plastic deformation or fracture usually occurs at a small strain. In this work, we show that a SrNi2P2 micropillar exhibits pseudoelasticity with a large maximum recoverable strain of ∼14% under uniaxial compression via unique reversible structural transformation, double lattice collapse–expansion that is repeatable under cyclic loading. Its high yield strength (∼3.8 ± 0.5 GPa) and large maximum recoverable strain bring out the ultrahigh modulus of resilience (∼146 ± 19 MJ/m3), a few orders of magnitude higher than that of most engineering materials. The double lattice collapse–expansion mechanism shows stress–strain behaviors similar to that of conventional shape-memory alloys, such as hysteresis and thermo-mechanical actuation, even though the structural changes involved are completely different. Our work suggests that the discovery of a new class of high-performance ThCr2Si2-structured materials will open new research opportunities in the field of pseudoelasticity.
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This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in Nano Letters, copyright © 2022 American Chemical Society after peer review. To access the final edited and published work see DOI: 10.1021/acs.nanolett.1c01750. Posted with permission.
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