Analysis of neutron diffraction spectra acquired in situ during mechanical loading of shape memory NiTiFe at low temperatures

    Authors

    V. B. Krishnan; R. M. Manjeri; B. Clausen; D. W. Brown;R. Vaidyanathan

    Comments

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    Abbreviated Journal Title

    Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process.

    Keywords

    NiTiFe shape memory alloy; phase transformation; neutron diffraction; Rietveld refinement; R-phase; R-PHASE; SUPERELASTIC NITI; CRYSTAL-STRUCTURE; TIC COMPOSITES; ALLOYS; TRANSFORMATIONS; TI50NI47FE3; REFINEMENT; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering

    Abstract

    The Spectrometer for Materials Research at Temperature and Stress (SMARTS) at Los Alamos National Laboratory was used to acquire neutron diffraction spectra in situ during mechanical loading at 216 and 237 K. The experiments were performed with the objective of following the texture, strain and phase fraction evolution in the trigonal R-phase in a Ni46.8Ti50Fe3.2 shape memory alloy. A methodology to quantify the textures, strains and phase fractions using the General Structure Analysis System (GSAS) for Rietveld refinement of neutron diffraction spectra, is implemented and described. Emphasis is placed on evaluating the choice of P3 and P (3) over bar space groups for the R-phase in the refinements and the impact of this choice on the quantitative analyses of spectra. (C) 2007 Elsevier B.V. All rights reserved.

    Journal Title

    Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing

    Volume

    481

    Publication Date

    1-1-2008

    Document Type

    Article; Proceedings Paper

    Language

    English

    First Page

    3

    Last Page

    10

    WOS Identifier

    WOS:000255716100002

    ISSN

    0921-5093

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