Pseudoelasticity of SrNi2P2 Micropillar via Double Lattice Collapse and Expansion

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2021-CanfieldPaul-Pseudoelasticity.pdf (2.29 MB)

Date

2021-09-24

Authors

Xiao, Shuyang
Borisov, Vladislav
Gorgen-Lesseux, Guilherme
Rommel, Sarshad
Song, Gyuho
Maita, Jessica M.
Aindow, Mark
Valentí, Roser
Canfield, Paul
Lee, Seok-Woo

Publisher

Iowa State University Digital Repository, Ames IA (United States)

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Authors

Canfield, Paul

Person

Organizational Units

Physics and Astronomy

Organizational Unit

Ames Laboratory

Organizational Unit

Department

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.

Comments

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. DOE Contract Number(s): AC02-07CH11358. Posted with permission.