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This study investigated the microstructures and mechanical properties of ZK60 alloy prepared by a simplified rapid solidification powder metallurgy (RS P/M) processing system (S-RS P/M), which consists of warm press in dry air and hot extrusion. Microstructure characterizations showed that S-RS P/M alloy consisted of magnesium matrix and oxide stringers of～1 μm in width. TEM (transmission electron microscopy) observations illustrated nano-size magnesia particles (10-30 nm) constituted oxide stringer in detail. Due to a relatively higher volume of nano-size magnesia particle produced during S-RS P/M process, 0.2% yield strength of S-RS P/M ZK60 alloy was found to be as high as 382 MPa, which is 10% higher than that of RS P/M alloy. The improvement in mechanical properties is mainly attributed to the combination effects of Orowan mechanism and coefficient of thermal expansion (CTE) mismatch because of the approximately same average grain size.
This study investigated the microstructures and mechanical properties of ZK60 alloy prepared by a simplified rapid solidification powder metallurgy (RS P / M) processing system (S-RS P / M), which consists of warm press in dry air and hot extrusion. showed that S-RS P / M alloy consisted of magnesium matrix and oxide stringers of ~ 1 μm in width. TEM (transmission electron microscopy) observations nano-size magnesia particles (10-30 nm) formed oxide stringer in detail. Due to a relatively higher volume of nano-size magnesia particle produced during the S-RS P / M process, 0.2% yield strength of S-RS P / M ZK60 alloy was found to be as high as 382 MPa, which is 10% higher than that of RS P / M alloy. The improvement in mechanical properties is mainly attributed to the combination effects of Orowan mechanism and coefficient of thermal expansion (CTE) mismatch because of the approximately same average grain size.