Micromechanical quantification of elastic, twinning, and slip strain partitioning exhibited by polycrystalline, monoclinic nickel-titanium during large uniaxial deformations measured via in-situ neutron diffraction

A. P. Stebner*, S. C. Vogel, R. D. Noebe, T. A. Sisneros, B. Clausen, D. W. Brown, A. Garg, L. C. Brinson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

74 Scopus citations

Abstract

We draw upon existing knowledge of twinning and slip mechanics to develop a diffraction analysis model that allows for empirical quantification of individual deformation mechanisms to the macroscopic behaviors of low symmetry and phase transforming crystalline solids. These methods are applied in studying elasticity, accommodation twinning, deformation twinning, and slip through neutron diffraction data of tensile and compressive deformations of monoclinic NiTi to ~18% true strain. A deeper understanding of tension-compression asymmetry in NiTi is gained by connecting crystallographic calculations of polycrystalline twinning strains with in situ diffraction measurements. Our analyses culminate in empirical, micromechanical quantification of individual elastic, accommodation twinning, deformation twinning, and slip contributions to the total macroscopic stress-strain response of a monoclinic material subjected to large deformations. From these results, we find that 20-40% of the total plastic response at high strains is due to deformation twinning and 60-80% due to slip.

Original languageEnglish (US)
Pages (from-to)2302-2330
Number of pages29
JournalJournal of the Mechanics and Physics of Solids
Volume61
Issue number11
DOIs
StatePublished - Nov 2013

Keywords

  • Monoclinic
  • Neutron diffraction
  • Plasticity
  • Shape memory alloy
  • Twinning

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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