Title

Texture, strain, and phase-fraction measurements during mechanical cycling in superelastic NiTi

Authors

Authors

R. Vaidyanathan; M. A. M. Bourke;D. C. Dunand

Comments

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Abbreviated Journal Title

Metall. Mater. Trans. A-Phys. Metall. Mater. Sci.

Keywords

SHAPE-MEMORY ALLOYS; TI-NI ALLOYS; NEUTRON-DIFFRACTION; PSEUDOELASTICITY; CHARACTERISTICS; RIETVELD REFINEMENT; COMPOSITES; TRANSFORMATIONS; DEFORMATION; TEMPERATURE; FATIGUE; Materials Science, Multidisciplinary; Metallurgy & Metallurgical; Engineering

Abstract

Superelastic NiTi was subjected to simultaneous neutron diffraction and uniaxial compressive cycling between 10 and 980 MPa. The objective was an in-situ investigation of the evolution of the stress-induced, reversible transformation between austenite and martensite, to determine the cause of the changes in the macroscopic stress-strain response with cycling. Rietveld refinement was used to analyze the neutron spectra and quantify the phase fraction, texture, and elastic strain. The average phase strain in the mechanically loaded austenite (at a given stress) remained unaltered during the 100 load-unload cycles. However, differences in both the volume fraction and texture of austenite and martensite were noted as cycling progressed, suggesting that these factors are responsible for the changes in the macroscopic stress-strain response of NiTi with mechanical cycling.

Journal Title

Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science

Volume

32

Issue/Number

3A

Publication Date

1-1-2001

Document Type

Article

Language

English

First Page

777

Last Page

786

WOS Identifier

WOS:000167694700013

ISSN

1073-5623

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