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

    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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