Study on tension-compression yield symmetry of extruded Mg-4.83Gd-2.36Nd-0.21Zr alloy with rare earth texture

The mechanical response of tension-compression yield symmetry in extruded Mg-4.83Gd-2.36Nd-0.21Zr alloy along extrusion direction was systematically investigated. The results showed that the extruded alloy exhibited a homogeneous microstructure containing fine dynamically recrystallized grains and dispersed Mg₅(Gd,Nd) particles, along with a weak rare earth texture. Quasi-in-situ EBSD analysis revealed that basal slip was the predominant mechanism during the yield stages, due to the weak rare earth texture of the alloy. A quantitative analysis of deformation modes and transfer types in tension and compression was carried out. It was revealed that the similar deformation modes resulted in analogous grain interior obstacles. The similar deformation transfer capabilities led to comparable grain boundary obstacles, as indicated by the geometric compatibility factor (m′) and the activation stress difference (ΔStress) between neighboring grains. These factors contributed to the tension-compression yield symmetry of the experimental alloy.