A new type of superelastic and shape memory materials: ThCr2Si2- structured novel intermetallic compounds at small length scales
October 1-6, 2017
Crystalline, superelastic materials typically exhibit large recoverable strains due to the ability of the material to undergo a reversible phase transition between martensite and austenite phases. Applicable to various alloys, ceramics and intermetallic compounds, this reversible transition serves as a general mechanism for superelasticity and shape memory effect. Recently, we noticed that ThCr2Si2-structured intermetallic compounds exhibit a reversible phase transition between a tetragonal (or orthorhombic) phase to a collapsed tetragonal phase under compression along c-axis of the unit cell by making and breaking Si-Si type bonds. This process has nothing to do with martensitic transformation. This unique reversible phase transformation process motivated us to investigate their potential as a superelastic and shape memory material.
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Seok-Woo Lee, John T. Sypek, Keith J. Dusoe, Hetal Patel, Amanda M. Giroux, Hang Yu, Alan I. Goldman, Sergey L. Bud'ko, Andreas Kreyssig, Paul C. Canfield, and Christopher R. Weinberger, "A new type of superelastic and shape memory materials: ThCr2Si2- structured novel intermetallic compounds at small length scales" in "Nanomechanical Testing in Materials Research and Development VI", Karsten Durst, Technical University of Darmstadt, Germany Eds, ECI Symposium Series, (2017). http://dc.engconfintl.org/nanomechtest_vi/83