Effects of casting process on microstructures and flow stress behavior of Mg–9Gd–3Y–1.5Zn–0.8Zr semi-continuous casting billets

Abstract

Mge9Gde3Ye1.5Zne0.8Zr alloys own high strength, good heat and corrosion resistance. However, it is difficult for the fabrication of large-scale billets, due to the poor deformation ability and strong hot-crack tendency. This work investigated the casting process on the microstructures and flow stress behaviors of the semi-continuous casting billets for the fabrication of large-scale Mge9Gde3Ye1.5Zne0.8Zr billets. The casting process (electromagnetic intensity and casting speed) shows outstanding effects on the microstructures and flow stress behavior of the billets. The billets with the specific casting process (I ¼ 68 A, V ¼ 65 mm/min) exhibit uniform microstructures and good deformation uniformity.

High temperature oxidation behavior of Mg-Y-Sn, Mg-Y, Mg-Sn alloys and its effect on corrosion property

“…Besides, the formation of rare earth oxide in the interface can strengthen the adhesive force of oxide film and matrix [9,10]. Thereby, in the present work, rare earth element Y (Pilling-Bedworth ratio is 1.39) and metal element Sn (Pilling-Bedworth ratio is 1.32) are added into pure Mg to expect to get denser and more protective oxide film.…”