The results showed that adding 0.2%Sc and 0.1%Zr to Al 5Mg alloy leads to strong grain refinement but adding only 0.2%Sc to Al 5Mg alloy has no grain refinement phenomenon.

• 结果发现，0?2%25的Sc并未使Al?Mg合金产生晶粒细化作用，而0?2%25的Sc与0?1%25的Zr复合添加则使Al?Mg合金产生了极其强烈的晶粒细化作用。