Pseudoelasticity of SrNi$_2$P$_2$ micropillar via Double Lattice Collapse and Expansion

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

doi:10.1021/acs.nanolett.1c01750

paper

Pseudoelasticity of SrNi $_{2}$ P $_{2}$ micropillar via Double Lattice Collapse and Expansion

arXiv:2108.11999 · doi:10.1021/acs.nanolett.1c01750

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 SrNi $_{2}$ P $_{2}$ 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 $\pm$ 0.5 GPa) and large maximum recoverable strain bring out the ultrahigh modulus of resilience (~146 $\pm$ 19MJ/m $^{3}$ ) a few orders of magnitude higher than that of most engineering materials. The double lattice collapse-expansion mechanism shows stress-strain behaviors similar with 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 ThCr $_{2}$ Si $_{2}$ -structured materials will open new research opportunities in the field of pseudoelasticity.

Pseudoelasticity of SrNi2​P2​ micropillar via Double Lattice Collapse and Expansion

Abstract

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Pseudoelasticity of SrNi $_{2}$ P $_{2}$ micropillar via Double Lattice Collapse and Expansion