Title

Thermal cycling and isothermal deformation response of polycrystalline NiTi: Simulations vs. experiment

Authors

Authors

S. Manchiraju; D. Gaydosh; O. Benafan; R. Noebe; R. Vaidyanathan;P. M. Anderson

Comments

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Abbreviated Journal Title

Acta Mater.

Keywords

Shape memory alloys; Thermal cycling; Finite element; SHAPE-MEMORY ALLOYS; TRANSFORMATION-INDUCED PLASTICITY; SINGLE-CRYSTALS; PART I; BEHAVIOR; MODEL; STRESS; REORIENTATION; DEPENDENCE; TEXTURE; Materials Science, Multidisciplinary; Metallurgy & Metallurgical; Engineering

Abstract

A recent microstructure-based FEM model that couples crystal-based plasticity, the B2 <-> B19' phase transformation and anisotropic elasticity at the grain scale is calibrated to recent data for polycrystalline NiTi (49.9 at.% Ni). Inputs include anisotropic elastic properties, texture and differential scanning calorimetry data, as well as a subset of recent isothermal deformation and load-biased thermal cycling data. The model is assessed against additional experimental data. Several experimental trends are captured - in particular, the transformation strain during thermal cycling monotonically increases and reaches a peak with increasing bias stress. This is achieved, in part, by modifying the martensite hardening matrix proposed by Patoor et al. [Patoor E, Eberhardt A, Berveiller M. J Phys IV 1996;6:277]. Some experimental trends are underestimated - in particular, the ratcheting of macrostrain during thermal cycling. This may reflect a model limitation that transformation plasticity coupling is captured on a coarse (grain) scale but not on a fine (martensitic plate) scale. Published by Elsevier Ltd. on behalf of Acta Materialia Inc.

Journal Title

Acta Materialia

Volume

59

Issue/Number

13

Publication Date

1-1-2011

Document Type

Article

Language

English

First Page

5238

Last Page

5249

WOS Identifier

WOS:000293113600018

ISSN

1359-6454

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