Quantitative study on the tension-compression yield asymmetry of a Mg-3Al-1Zn alloy with bimodal texture components

This study demonstrates the yield asymmetry in Mg-3Al-1Zn alloy containing both ND-texture (c-axis // ND (Normal direction)) and TD-texture (c-axis // TD (Transverse direction)) in a quantitative view. The results showed that the yield asymmetry is strongly dependent on the distribution of bimodal texture components, on the basis of the successful establishment of the quantified relationship between pre-deformation parameters and texture components distribution. It's meaningful for providing key reference to texture design. Mechanical behavior of bimodal textured Mg alloy under tension and compression was tested. CYS/TYS (compressive yield stress / tensile yield stress) equal to 1 is obtained, implying that the yield asymmetry is eliminated when two textures distribute at specific fractions. The corresponding mechanism for the texture-dependence of tension-compression yield asymmetry is revealed by the analysis of slip/twinning activities and a compound use of the activation stress difference of slip/twinning (AStress) and geometrical compatibility factor ( m ' ) between neighboring grains. Balanced activity of { 10 1 over line 2 } twinning and a quite similar boundary obstacle effect against slip/twinning transfer under tension and compression accounts for such good symmetry performance.(c) 2022 Chongqing University. Publishing services provided by Elsevier B.V. on behalf of KeAi Communications Co. Ltd.

Automated summary

This study quantitatively demonstrates the yield asymmetry in Mg-3Al-1Zn alloy with both ND texture and TD texture. The distribution of bimodal texture components plays a key role in the yield asymmetry, providing important reference for texture design. Testing the mechanical behavior of the bimodal textured Mg alloy under tension and compression reveals that the yield asymmetry is eliminated when two textures distribute at specific fractions.