Entropic stabilization of austenite in shape memory alloys |
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Authors: | Ryan S Elliott Daniel S Karls |
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Institution: | Department of Aerospace Engineering and Mechanics, University of Minnesota, Minneapolis, MN 55455, USA |
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Abstract: | Martensitic transformations (MTs) are the key phenomena responsible for the remarkable properties of Shape Memory Alloys (SMAs). Recent Density Functional Theory (DFT) electronic structure calculations have revealed that the austenite structure of many SMAs is a saddle-point of the material's potential energy landscape. Correspondingly, the austenite is unstable and thus unobservable at zero temperature. Thus, the observable high temperature austenite structure in many SMAs is entropically stabilized by nonlinear dynamic effects. |
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Keywords: | Entropic stabilization Phase transformation Vibrations Constitutive behavior Stability and bifurcation |
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