This report shows first investigation of microstructure development and its effect on mechanical strength and corrosion resistance of non-commercial magnesium alloy WN43 processed extrusion (Ex) and equal-channel angular pressing (ECAP). Bimodal grain size distribution with high volume fraction of ultra-fine grains about 650 nm in diameter was achieved after 4 passes through ECAP. The microhardness measurement showed substantial increase of mechanical strength; however, initial corrosion attack investigated by linear polarization method was found to be more severe in the ECAPed condition. Deterioration of the initial corrosion resistance was attributed to high volume fraction of the grain boundaries and other lattice defects.Keywords: WN43 alloy, ECAP, ultra-fine-grain microstructure, corrosion
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