Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1499582 | Scripta Materialia | 2011 | 4 Pages |
The evolution of stress and lateral strains with applied strain was determined by uniaxial loading in the principal directions of a highly textured Mg–3Al–1Zn plate. The material exhibits negative lateral strain ratios when twinning dominates deformation. This leads to a yield surface with a distinct shape, with a high curvature under a balanced biaxial stress state and a shift in plane-strain compression conditions from the third to the second and fourth quadrants of the yield surface.
Research highlights► We examine the texture effects on lateral strains of AZ31 alloys. ► Calculation of strain field caused by twinning suggests a negative R-value. ► In-plane compression test of AZ31 proves the negative R-value. ► Extensive twinning leads to an anomalous yield surface.