On elastic moduli and elastic anisotropy in polycrystalline martensitic NiTi
Abbreviated Journal Title
Acta Mater.
Keywords
Elastic modulus; Martensite; Shape memory; Anisotropy; Neutron; diffraction; ACQUIRED IN-SITU; DIFFRACTION SPECTRA; RIETVELD REFINEMENT; SUPERELASTIC; NITI; TEXTURE; STRAIN; STRESSES; Materials Science, Multidisciplinary; Metallurgy & Metallurgical; Engineering
Abstract
A combined experimental and computational effort was undertaken to provide insight into the elastic response of B19' martensitic NiTi variants as they exist in bulk, polycrystalline aggregate form during monotonic tensile and compressive loading. The experimental effort centered on using in situ neutron diffraction during loading to measure elastic moduli in several directions along with an average Young's modulus and a Poisson's ratio. The measurements were compared with predictions from a 30,000 variant, self-consistent polycrystalline deformation model that accounted for the elastic intergranular constraint, and also with predictions of single crystal behavior from previously published ab initio studies. Variant conversion and detwinning processes that influenced the intergranular constraint occurred even at stresses where the macroscopic stress strain response appeared linear. Direct evidence of these processes was revealed in changes in texture, which were captured in inverse pole figures constructed from the neutron diffraction measurements. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Journal Title
Acta Materialia
Volume
59
Issue/Number
13
Publication Date
1-1-2011
Document Type
Article
Language
English
First Page
5055
Last Page
5066
WOS Identifier
ISSN
1359-6454
Recommended Citation
"On elastic moduli and elastic anisotropy in polycrystalline martensitic NiTi" (2011). Faculty Bibliography 2010s. 1786.
https://stars.library.ucf.edu/facultybib2010/1786
Comments
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