Local Anisotropic Deformation Behavior of Hot‐Extruded AZ31 Bars on Different Loading Directions

Magnesium (Mg) alloys typically exhibit remarkable deformation anisotropy due to their hexagonal close‐packed structure and prevalent basal texture. A comprehensive understanding of the correlation between deformation anisotropy and deformation mechanisms is crucial for optimizing their workability. Here, uniaxial tensile tests were performed on hot‐extruded AZ31 Mg alloy bars along different loading directions (LD). To characterize the local anisotropic deformation in tensile samples, deformation ratios along length, width, and thickness directions were systematically measured. The results reveal distinct anisotropic deformation in tensile samples. The deformation ratios displayed gradual variation with the LD. Furthermore, the volume fraction of grains that preferentially activate different deformation mechanisms was calculated. The dominating deformation mechanisms rely on the local deformation direction and the LD. The intrinsic relationship between anisotropic deformation and deformation mechanisms, as well as their effect on microstructure and texture are presented and discussed. This work enhances the fundamental understanding of the local deformation anisotropy in Mg alloy bars and clarifies the core mechanisms governing this anisotropic behavior.