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- W2528364027 abstract "For NiTi based alloys, the shape memory effect is governed by a transition from a low-temperature martensite phase to a high-temperature austenite phase. Despite considerable experimental and computational work, basic questions regarding the stability of the phases and the martensitic phase transition remain unclear even for the simple case of binary, equiatomic NiTi. We perform ab initio molecular dynamics simulations to describe the temperature-dependent behavior of NiTi and resolve several of these outstanding issues. Structural correlation functions and finite temperature phonon spectra are evaluated to determine phase stability. In particular, we show that finite temperature, entropic effects stabilize the experimentally observed martensite (B19') and austenite (B2) phases while destabilizing the theoretically predicted (B33) phase. Free energy computations based on ab initio thermodynamic integration confirm these results and permit estimates of the transition temperature between the phases. In addition to the martensitic phase transition, we predict a new transition between the B33 and B19' phases. The role of defects in suppressing these phase transformations is discussed." @default.
- W2528364027 created "2016-10-14" @default.
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- W2528364027 date "2016-01-01" @default.
- W2528364027 modified "2023-09-23" @default.
- W2528364027 title "Ab Initio Simulations of Temperature Dependent Phase Stability and Martensitic Transitions in NiTi" @default.
- W2528364027 hasPublicationYear "2016" @default.
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