Title

Temperature-dependent behavior of a polycrystalline NiTi shape memory alloy around the transformation regime

Authors

Authors

O. Benafan; R. D. Noebe; S. A. Padula; D. J. Gaydosh; B. A. Lerch; A. Garg; G. S. Bigelow; K. An;R. Vaidyanathan

Comments

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Abbreviated Journal Title

Scr. Mater.

Keywords

Shape memory alloys; NiTi; Martensite reorientation; Dynamic modulus; Neutron diffraction; MODULI; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering

Abstract

The mechanical and microstructural behavior of a polycrystalline Ni49.9Ti50.1 (at.%) shape memory alloy was investigated as a function of temperature around the transformation regime. The bulk macroscopic responses, measured using ex situ tensile deformation and impulse excitation tests, were compared to the microstructural evolution captured using in situ neutron diffraction. The onset stress for inelastic deformation and dynamic Young's modulus were found to decrease with temperature in the martensite regime followed by an increase starting near the austenite start temperature, attributed to the reverse transformation. Published by Elsevier Ltd. on behalf of Acta Materialia Inc.

Journal Title

Scripta Materialia

Volume

68

Issue/Number

8

Publication Date

1-1-2013

Document Type

Article

Language

English

First Page

571

Last Page

574

WOS Identifier

WOS:000316042100007

ISSN

1359-6462

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