Abstract
The cross‐sectional inhomogeneity of the extruded Mg–7.5Gd–1.5Y–0.4Zr–0.5Ag (wt%) is investigated by experimental and numerical methods. There is an interesting phenomenon in which a fine‐grain ring in the surface region of the extrusion rod is found. The microstructure of the fine‐grain ring consists of fully recrystallized equiaxed grains with an average grain size of 12.7 μm. In contrast, the bimodal microstructure with an average grain size of 18.9 μm is the main characteristic in the center region, and nonrecrystallized grains are elongated along the extrusion direction. The finite element analysis results demonstrate that compared with the center region, the surface region exhibits higher strain and stress during the extrusion process, which improves the degree of recrystallization and refines grains. Finally, the comprehensive mechanical properties of the surface region are better than those of the center region due to the positive role of the surface fine grains.
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