|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Advanced Characterization Techniques for Quantifying and Modeling Deformation Mechanisms
||In-situ Structural and Mechanical Characterization of ThCr2Si2-structured Superelastic Intermetallic Compounds
||Keith Dusoe, Ian Bakst, John Sypek, Gil Drachuck, 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 that are associated with twinning and de-twinning processes. Applicable to various alloys, ceramics and intermetallic compounds, this reversible transition serves as a general mechanism for superelasticity. In our recent work, a new superelasticity mechanism has been observed in a novel ternary intermetallic compound, CaFe2As2. Of the ThCr2Si2-type intermetallic compounds, this material exhibits a reversible phase transition between tetragonal and collapsed tetragonal phases under compression. In this presentation, two very different ThCr2Si2 structured intermetallic compounds, LaRu2P2 and CaFe2As2, are compared. Single crystal solution growth, in-situ micropillar compression, in-situ X-ray diffraction, and density functional theory calculation was used to elucidate the unique superelasticity mechanisms at work. We will also discuss the potential applications of these materials as cryogenic linear actuators and switching devices which can operate in extremely cold environments.
||Planned: Supplemental Proceedings volume