On elastic moduli and elastic anisotropy in polycrystalline martensitic NiTi

被引：95

作者：

Qiu, S. ^{[1
]}

Clausen, B. ^{[2
]}

Padula, S. A., II ^{[3
]}

Noebe, R. D. ^{[3
]}

Vaidyanathan, R. ^{[1
]}

机构：

[1] Univ Cent Florida, AMPAC, Mech Mat & Aerosp Engn Dept, Orlando, FL 32816 USA

[2] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[3] NASA, Glenn Res Ctr, Cleveland, OH 44135 USA

来源：

ACTA MATERIALIA | 2011年 / 59卷 / 13期

关键词：

Elastic modulus; Martensite; Shape memory; Anisotropy; Neutron diffraction; ACQUIRED IN-SITU; DIFFRACTION SPECTRA; RIETVELD REFINEMENT; SUPERELASTIC NITI; TEXTURE; STRAIN; STRESSES;

D O I：

10.1016/j.actamat.2011.04.018

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页码：5055 / 5066

页数：12

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