Assessment of tribocorrosion properties of friction extruded wires fabricated from recycled magnesium alloy chips

This work examines the tribological characteristics and microstructural alterations of an alloy of recycled wire exposed to friction extrusion (FE). According to microstructural examination, the FE method causes dynamic recrystallization, which produces fine grains and fractured precipitates. Initial contact with the tool triggers the friction extrusion mechanism, which causes homogenous deformation and strain-induced recrystallization. In contrast to the base metal's 100 µm grain size, the recycled wire's grain size lowered to 18 µm. The FE recycled wire has a higher hardness than the base alloy, according to the Hall-Petch relationship. Wet sliding tribological tests show reduced friction coefficients as a result of lubrication; the FE recycled wire shows more resilience to wear and tribocorrosion. In contrast, FE-recycled wire exhibits plastic deformation and increased tribocorrosion resistance. Dry and wet average friction coefficients varied between 0.2 and 0.14, less than those of the base metal, 0.3 and 0.25. Surface inspection of worn samples reveals considerable deformation, delamination, and severe material loss in the base alloy. The recycled wire reflects 20 µm, as opposed to the base metal, 80 µm, indicating that this tendency continues to the wear track depths.