Crystal plasticity modeling and neutron diffraction measurements of a magnesium AZ31B plate: Effects of plastic anisotropy and surrounding grains

Huamiao Wang, Soo Yeol Lee*, E. Wen Huang, Jayant Jain, Dayong Li, Yinghong Peng, Ho Suk Choi, Peidong Wu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

This study used in-situ neutron diffraction measurements and Elastic ViscoPlastic Self-Consistent polycrystal plasticity model, which incorporates a Twinning and DeTwinning scheme (denoted by EVPSC-TDT), to examine the macro-and micro-mechanical behaviors of a rolled AZ31B plate subjected to uniaxial tension. Three specimens were specifically designed for minimum, maximum and intermediate twinning: (1) loading along the rolling direction, (2) loading along the plate normal, and (3) loading along the direction 45° with respect to the plate normal. Apart from the macroscopic stress strain response, the measured diffraction intensities and internal elastic strains were obtained to examine the activities of the deformation modes at the grain level. The diffraction intensity evolution signaled the volume fraction change of twinning, while the internal elastic strain evolution designated the stress partitioning among the grain orientations. The effect of the surrounding grains on the development of the internal elastic strain was investigated by identifying the corresponding deformation mechanisms. Notably, the corresponding modeling work revealed that the EVPSC-TDT model permitted the prediction of the strain hardening and anisotropic behavior along the directions with minimum, maximum and intermediate twinning at the macroscale, and the evolution of the diffraction intensities and internal strains at the microscale. The results provide a physical understanding of the effects of the load direction, texture and surrounding grains on the role of the deformation modes in hexagonal close-packed polycrystalline materials.

Original languageEnglish
Article number103795
Number of pages20
JournalJournal of the Mechanics and Physics of Solids
Volume135
DOIs
StatePublished - Feb 2020

Keywords

  • Magnesium alloy
  • Twinning
  • Surrounding grain
  • Neutron diffraction
  • EVPSC model
  • DEFORMATION-BEHAVIOR
  • STRESS-RELAXATION
  • ALLOY AZ31B
  • MECHANICAL-BEHAVIOR
  • DETWINNING BEHAVIOR
  • LATTICE STRAINS
  • RESIDUAL-STRESS
  • TEXTURE
  • EVOLUTION
  • SLIP

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