A phase-field model of twinning and detwinning coupled with dislocation-based crystal plasticity for HCP metals

R. Kondo, Y. Tadano, K. Shizawa

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

In this study, a phase-field model describing both twinning and detwinning that is coupled with a dislocation-based crystal plasticity model is constructed for HCP metals, particularly for magnesium. The driving force of twinning is assumed to be resolved shear stress acting on the twin system. The plastic anisotropy of dislocation mobility in an HCP crystal is described via the dislocation mean free path model, which is incorporated into the hardening law. These models are coupled through an order parameter and stress. Using the present model, several FE analyses on single-crystal magnesium are carried out. The obtained results show that the nominal stress-strain response, twinning and detwinning behavior and the consistent value of twin shear around twins are reproduced by this model. In addition, from the results of tensile simulation of a specimen including a number of twin nuclei, twin nucleation is suggested to occur so as not to increase the mechanical energy by the accumulation of elastic strain and dislocation.

Original languageEnglish
Pages (from-to)672-683
Number of pages12
JournalComputational Materials Science
Volume95
DOIs
Publication statusPublished - 2014 Dec

Keywords

  • Crystal plasticity
  • Dislocations
  • Finite elements
  • Phase-field method
  • Twinning

ASJC Scopus subject areas

  • Computer Science(all)
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Physics and Astronomy(all)
  • Computational Mathematics

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