The density of magnesium is 1740kg/m3, which is the lightest metal. The weight of magnesium is 1/1.5 of aluminum and 1/4 of zinc when compared at the same volume. In recent years, the consumption of magnesium is enlarged owing to the thought of energy-saving and environmental protection, especially in transportation. In transportation, the lighter weight of vehicle is more and more required. If magnesium alloy can be make up some parts, we can lighten the weight of vehicle largely. Furthermore, magnesium al...