Document Type

Article

Publication Version

Published Version

Publication Date

8-21-2014

Journal or Book Title

Physical Review B

Volume

90

First Page

060102(R)

DOI

10.1103/PhysRevB.90.060102

Abstract

Nitinol (NiTi), the most widely used shape-memory alloy, exhibits an austenite phase that has yet to be identified. The usually assumed austenitic structure is cubic B2, which has imaginary phonon modes, hence it is unstable. We suggest a stable austenitic structure that “on average” has B2 symmetry (observed by x-ray and neutron diffraction), but it exhibitsfinite atomic displacements from the ideal B2 sites. The proposed structure has a phonon spectrum that agrees with that from neutron scattering, has diffraction spectra in agreement with x-ray diffraction, and has an energy relative to the ground state that agrees with calorimetry data.

Comments

This article is from Physical Review B 90 (2014): 060102(R), doi:10.1103/PhysRevB.90.060102. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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