The gas-atomized powder prepared from AE42 magnesium alloy was mechanically milled at various conditions. The effect of milling on the size, morphology and particle microstructure was investigated. It was shown that dry milling at room temperature in argon atmosphere leads to significant refinement of the powder, but the negative effect of cold-welding was observed despite the addition of the process control agent. On the other hand, wet milling in ethanol suppressed the cold-welding and resulted in a significant change of particles morphology from spherical-like to flake-like. The microstructure of powder particles was severely refined, but further investigation by transmission electron microscopy is needed. In addition, it was shown that the continuous oxide layer present on the gas-atomized particles was successfully disrupted by the mechanical milling.Keywords: magnesium, powder, milling, microstructure
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