Enhanced Mechanical and Anti-Wear Properties of Magnesium by Alloying and Subsequent Extrusion–Aging Treatment

In this work, the microstructure, mechanical, and anti-wear properties of alloyed-extruded-aged Mg-8.3Gd-4.5Y-1.4Zn-0.3Zr (wt%) alloys were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), nanoindentation, wear tests. Results showed that alloying—extrusion processing induced a significant grain refinement magnesium resulting in formation bulk Mg24(GdYZn)5 at boundaries. The size decreased from 116 μm pure to 17 alloyed-extruded magnesium, while refinement, solid solution second phase strengthening led hardness enhancement 0.67 GPa 1.64 magnesium. Aging treatment further drove structural homogenization an enhanced 1.83 GPa. During sliding tests, large-area plastic deformation layer formed on track surface leading unstable friction coefficient high rate 2.64 × 10−3 mm3·N−1·m−1. alloying—extrusion—aging treatments effectively inhibited layer. material 1.60 contrast, lower 1.16 failure mechanisms all fabricated materials discussed according characterization results.