Precipitation modification in cast Mg–1Nd–1Ce–Zr alloy by Zn addition

Abstract

Abstract The effects of different Zn addition (0, 0.2, 0.5, 1.0\u202fwt%) on the microstructure and mechanical properties of cast Mg–1Nd–1Ce–Zr alloy in as-cast, solution-treated and 200\xa0°C peak-aged conditions were studied. Precipitates in cast Mg–1Nd–1Ce–Zr alloy are significantly modified by the Zn addition. In the Zn-free alloy, the disk-shaped prismatic precipitates and the point-like precipitates are the main strengthening phases. When 0.2\xa0Zn is added, the disk-shaped precipitates are refined and very fine basal precipitates form additionally. When 0.5\xa0Zn is added, the basal precipitates become the main strengthening phase. Further increasing the Zn addition to 1.0%, only spare basal precipitates and point-like precipitates exist. The 0.5\xa0Zn addition alloy has the highest strength at room temperature, whose yield strength, ultimate tensile strength and elongation in T6 condition are 136\u202fMPa, 237\u202fMPa and 9%, respectively.