Grain refiner for magnesium and magnesium alloy and preparation method thereof

摘要

Disclosed is a grain refiner for magnesium and magnesium alloy. The grain refiner is a master alloy of Al-Zr-C with a composition (by wt%) of : Zr 0.01%-10%, C 0.01%-0.3% and balance Al. A method for preparing the grain refiner is also disclosed. The grain refiner has good ability of nucleating and excellent ability of grain refinement for magnesium and magnesium alloy, and may be used industrially to cast and roll the section bar of magnesium and magnesium alloy.