Under the conditions of the twin-roll-cast, addition of grain refiners into the molten metals, which is also called inoculation treatment, is the most effective approach to produce castings with fine grains. Because of the invalidity of Zr in grain refinement in Al-containing Mg alloys due to the chemical reaction between Al and Zr, development of new and effective grain refiners for this type of alloys has become an emergent task and active research topic