Title

Texture, Strain, And Phase-Fraction Measurements During Mechanical Cycling In Superelastic Niti

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.

Publication Date

12-1-2001

Publication Title

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

Volume

32

Issue

13

Number of Pages

777-786

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1007/s11661-001-1012-y

Socpus ID

0011408296 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0011408296

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