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- W1966851625 abstract "We use density functional theory to characterize how size affects the relative stability of thin NiTi slabs of different crystal structures and its implication on the martensitic phase transition that governs shape memory. We calculate the surface energies of B2${}^{ensuremath{'}}$ phase (austenite), B19 (orthorhombic), B19${}^{ensuremath{'}}$ (martensite), and a body-centered orthorhombic phase, the theoretically predicted ground state. We find that (110)${}_{mathrm{B}2}$ surfaces with in-plane atomic displacements stabilize the austenite phase with respect to B19${}^{ensuremath{'}}$ and BCO; thus, slabs with such orientations are predicted to exhibit a decrease in martensite transition temperature with decreasing thickness. Our calculations predict a critical thickness of 2 nm, below which the transition would not occur. The opposite trend is observed in slabs with atomic displacements along the surface normal: the phase transformation temperature increases with decreasing size." @default.
- W1966851625 created "2016-06-24" @default.
- W1966851625 creator A5012570553 @default.
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- W1966851625 date "2012-01-27" @default.
- W1966851625 modified "2023-10-16" @default.
- W1966851625 title "Size effects in NiTi from density functional theory calculations" @default.
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- W1966851625 doi "https://doi.org/10.1103/physrevb.85.014114" @default.
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