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As one kind of lightweight alloys in the widely applications, magnesium alloys are currently the lightest structural materials with low density, high specific strength and specific stiffness, superior damping capacity [Michael et al., 1999; Mordike & Ebert, 2001]. The superior damping capacity is provided by the lower Young's modulus-E, and the value of E is no sensitive to material microstructures. When a structural component of magnesium alloy is subject to the same impact loadings, it can perform more elastic deformation and absorb more impact energy. Besides, stress distributions inside of a structural component of magnesium alloy are more uniform, thereby high stress concentrations can be avoided. Therefore, a structural component of magnesium alloy subjected to the impact loadings can be formed. Meanwhile, as one new continuous and local plastic forming technology, splitting spinning is designed to split a revolving disk blank from the outer rectangular edge into two flanges using a roller called splitting roller with a sharp corner, and then shaping spinning is done by two or three other forming rollers [Wong et al., 2003; Wang & Liu, 1986], as shown in Fig. 1. Compared with other conventional methods combining with casting, forging and welding and then mechanical processing, splitting spinning has the remarkable advantages of high efficiency, low cost and good flexibility, and its products for aeronautics, astronautics, automobile and weapon industry meet the high quality and high precision demands and are developed at low costs in a short time [Yang et al., 2004; Song et al., 2000]. Accordingly, based on the above remarkable advantages and application foregrounds of magnesium alloy AZ31 and the above manufacturing predominance of splitting spinning, a structure component of magnesium alloy AZ31 subjected to the impact loadings and with high quality and high precision can be formed using splitting spinning, such as, a wheel hub of aero undercarriage or kinds of light whole wheels. According to the past research on deformation property of magnesium alloy, the ductility and formability of magnesium alloy is low at room temperature due to its hexagonal close-

Hot Forming Characteristics of Magnesium Alloy AZ31 and Three-Dimensional FE Modeling and Simulation of the Hot Splitting Spinning Process