Texture multi-polarization and its impact on mechanical anisotropy in Mg-10Gd alloy

2025

Journal of Materials Research and Technology, Vol 36, Iss , Pp 7881-7896 (2025)

The anisotropic mechanical properties of wrought Mg alloys are significantly influenced by their crystallographic texture. This study examines the impact of texture multi-polarization on the mechanical anisotropy of Mg-10Gd (wt.%) alloy, using conventional extrusion (EX) and extrusion-shearing (ES) processes. A multipolar texture distribution was successfully achieved through the ES process, including basal textures ( or || extrusion direction (ED)), shear-induced B fiber texture (basal plane || shear plane), C-texture ( || ED) and “Rare Earth” texture (c-axis || shear direction). The evolution of microstructure and mechanical properties of the processed samples under tension and compression were thoroughly investigated. At equivalent strain levels applied via both EX and ES processes, the ES samples demonstrated superior mechanical properties and isotropy. The yield stress and elongation to failure of ES sample under tension were 166.48 MPa and 23.33 %, that is 19.92 % and 50.41 % higher than those of EX sample. The compressive yield strength ratio between ED and normal direction of the ES samples reached 0.93, higher than that of the EX samples (0.77). This improvement is attributed to the more homogenized microstructure and the multipolar textures. Moreover, the effect of individual texture components on plastic deformation and yield strength were calculated by Visco-Plastic Self Consistent (VPSC) modeling. The results suggested that variations in the activation of {10–12} extension twins are the primary factor responsible for the mechanical anisotropy observed under compression. For the ES sample, the grains with c-axis tilted towards the shear direction or the shear plane normal benefit the reduction of anisotropy.

article

English

Elsevier, 2025.

Mg–Gd alloy, Extrusion-shearing process, Mechanical anisotropy, Texture multi-polarization, Extension twin, Mining engineering. Metallurgy, TN1-997