Investigation on intragranular stress of mg including several twin-bands using dislocation-based crystal plasticity and phase-field models

Ruho Kondo, Yuichi Tadano, Kazuyuki Shizawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

A coupled model based on crystal plasticity and phase-field theories that express both plastic anisotropy of HCP metals and expansion/shrinkage of twin-bands is proposed in the present study. In this model, the difference of the hardening rate in each slip system is expressed by changing their dislocation mobility as a numerical parameter defined in the crystal plasticity framework. The stress calculated via crystal plasticity analysis becomes to the driving force of multi-phase-filed equations that express the evolution of twin bands of several variants, which include both the growth and shrinkage. Solving this equation set, the rate of twinning/detwinning and the mirror-transformed crystal basis in the twinned/detwinned phase are obtained and then, crystal plasticity analysis is carried out again. Using the present model, a uniaxial cyclic loading simulation along [0001] direction on the specimen including two variants of twin-bands is carried out by means of finite element method (FEM). The results show that the detwinning stress decreases with increase of the pre-tensioned strain. This is caused by a residual compression stress resulting from the twin shearing that occurs in the vicinity of two twin boundaries approaching each other.

Original languageEnglish
Title of host publicationAdvances in Engineering Plasticity XII
PublisherTrans Tech Publications Ltd
Pages246-251
Number of pages6
ISBN (Print)9783038352266
DOIs
Publication statusPublished - 2015 Jan 1
Event12th Asia-Pacific Conference on Engineering Plasticity and Its Application, AEPA 2014 - Kaohsiung, Taiwan, Province of China
Duration: 2014 Sep 12014 Sep 5

Publication series

NameKey Engineering Materials
Volume626
ISSN (Print)1013-9826
ISSN (Electronic)1662-9795

Other

Other12th Asia-Pacific Conference on Engineering Plasticity and Its Application, AEPA 2014
CountryTaiwan, Province of China
CityKaohsiung
Period14/9/114/9/5

Keywords

  • Crystal Plasticity
  • Deformation Twinning
  • Dislocation
  • FEM
  • Magnesium
  • Phase-field

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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  • Cite this

    Kondo, R., Tadano, Y., & Shizawa, K. (2015). Investigation on intragranular stress of mg including several twin-bands using dislocation-based crystal plasticity and phase-field models. In Advances in Engineering Plasticity XII (pp. 246-251). (Key Engineering Materials; Vol. 626). Trans Tech Publications Ltd. https://doi.org/10.4028/www.scientific.net/KEM.626.246