|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Mechanical Behavior at the Nanoscale IV
||Micro-mechanical Characterization of Novel ThCr2Si2-structured Intermetallic Compounds: Fundamental Understanding of Superelasticity by Experiment and Computer Simulation
||Keith Dusoe, Ian Bakst, John Sypek, Paul Canfield, Christopher Weinberger, Seok-Woo Lee
|On-Site Speaker (Planned)
Crystalline, superelastic materials typically exhibit large recoverable strains through a reversible phase transition between martensite and austenite phases. Applicable to various alloys, ceramics and intermetallic compounds, this reversible phase transition serves as a general mechanism for superelasticity. In our work, a new mechanism for superelasticity has been observed in novel ternary intermetallic compounds having the ThCr2Si2 type structure. Of these materials, LaRu2P2 and CaKFe4As4 micropillars both accommodate large, reversible strains (nearly 11%) by pressure-induced crystallographic collapse from the tetragonal phase to either a fully, or half-collapsed tetragonal phase, respectively. In this presentation, the differently structured ThCr2Si2 intermetallic compounds are compared and the presence of a cryogenic shape memory effect is discussed with the results of micropillar compression and DFT simulation. Furthermore, discussion of the potential applications of these materials as cryogenic linear actuators and as devices in which pressure-induced switching of superconductivity at operation in cold environments is possible.
||Planned: Supplemental Proceedings volume