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Meeting 2021 TMS Annual Meeting & Exhibition
Symposium Mechanical Response of Materials Investigated through Novel In-situ Experiments and Modeling
Presentation Title Giant Superelasticity in SrNi<sub>2</sub>P<sub>2</sub> Micropillars via Lattice Collapse and Expansion
Author(s) Shuyang Xiao, Vladislav Borisov, Guilherme Gorgen-Lesseux, Gyuho Song, Roser Valentí, Paul Canfield, Seok-Woo Lee
On-Site Speaker (Planned) Shuyang Xiao
Abstract Scope An elastic strain limit of most crystalline solids is less than one percent because the permanent shape change usually occurs at a very small strain. In order to obtain a large elastic strain limit, crystalline solids need to undergo a reversible structural transition. In this work, we show that a SrNi<sub>2</sub>P<sub>2</sub> single crystal micropillar exhibits the ultrahigh compressive elastic strain limit over 17% via double lattice collapse and expansion. High-resolution transmission electron microscopy revealed the co-existence of two different crystal structures, and density functional theory shows that each structure is collapsed at a different stress state. This superelastic deformation process is repeatable over 10<sup>4</sup> cycles. In comparison to other superelastic crystalline solids, the elastic strain limit of SrNi<sub>2</sub>P<sub>2</sub> is nearly the largest ever, and this result suggests that a new group of superelastic materials could be potentially discovered in ThCr<sub>2</sub>Si<sub>2</sub>-structured intermetallic compounds that can exhibit the similar structural transition.
Proceedings Inclusion? Planned:

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

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Analysis of Deformation Mechanisms in Advanced FeCrAl Alloy via SEM-EBSD In-situ Testing
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Creation of Strength Diagrams of Aluminum Flat Products, Dependent on the Different Thermomechanical Processes
Decoupling the Effect of Nanoscale Geometry and Internal Microstructure on the Mechanics of Nanoporous Pt
Deformation Tests of Al Thin Films Using In-situ TEM and Molecular Dynamics Simulations
Dislocation Density Inference from XRD Simulations of In-situ Microstructure Evolution Using Discrete Dislocation Dynamics
Dislocation Pileup Induced Transmission across Grain Boundaries in Aluminum via Molecular Dynamics Simulations
Dislocation Structure in FeCrAl Alloys through Advanced In-situ Microscopy Experiments
Effects of Phase Purity and Pore-reinforcement on the Mechanical Behavior of Metal–organic Frameworks
Experimental Measurements of Anisotropic Mechanical Behavior of 𝛽-HMX Crystals
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Impact of Precipitate Size, Orientation, and Temperature on Strain Hardening Behavior in Al-Cu Alloys
In-situ Analysis of Powder Bed Quality during Selective Laser Melting
In-situ Characterization of Material under Extreme Thermal Cycling Using High-speed Synchrotron X-ray Diffraction
In-situ Characterization of the Damage Initiation and Evolution in Sustainable Cellulose-based Cottonid
In-situ Experimental Evaluation of Residual Stresses in Composites during Autoclave Manufacturing
In-situ Investigation of Intergranular Crack Initiation in Hydrogen Embrittled Inconel 725
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MEMS-based In-situ Tensile Experiments Designed to Arrest Catastrophic Failure in Brittle Nanomaterials
Metal Foams: Linking Dynamic CT Results to Simulation and Modeling
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Microstructural Anisotropy and Its Influence on the Internal Stress Field within Grains: Experimental Confrontation with Full Field Crystal Plasticity Models
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