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A polycrystal based numerical investigation on the temperature dependence of slip resistance and texture evolution in magnesium alloy AZ31B

Authors
Journal
International Journal of Plasticity
0749-6419
Publisher
Elsevier
Volume
55
Identifiers
DOI: 10.1016/j.ijplas.2013.09.011
Keywords
  • Hexagonal-Close-Packed Magnesium
  • Polycrystal Plasticity-B
  • Deformation Twinning-A
  • Texture Evolution
  • Critical Resolved Shear Stress (Crss)

Abstract

Abstract Low thermoplastic formability is a key factor limiting the usage of magnesium alloys, which otherwise can have broad application in automotive industry for their competitive strength to density ratio. Combining with experimental calibration and validation, we report a systematic numerical investigation about the plastic deformation of magnesium alloy AZ31B at different temperatures and subjected to different boundary conditions. By employing 3D Voronoi grains based microstructure and the crystal plasticity constitutive model developed by Staroselsky and Anand (2003), which accounts for both dislocation slip and deformation twinning in polycrystalline magnesium, we estimate the dependence of critical resolved shear stresses (CRSS) of different slip/twinning systems on temperature. We further obtain the fractional plastic strains contributed by individual slip/twinning systems at different loading conditions. Grain level deformation analysis indicates that there exists significant stress and plasticity inhomogeneity among grains.

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