研究了微量Sc和Zr复合合金化对Al-Mg合金显微组织与拉伸性能的影响.结果表明:Sc和Zr复合微合金化可显著提高Al-Mg合金的强度.Al-Mg-Sc-Zr合金凝固过程中形成的初生Al3(Sc, Zr)复合粒子具有极强的晶粒细化作用,次生Al3(Sc, Zr)质点与Al-Mg-Sc合金中次生Al3Sc质点相比析出密度大大增加、分布更加均匀弥散、抑制再结晶的能力更为强烈.Sc和Zr复合微合金化大大促进了微量Sc在Al-Mg合金中的强化作用.由于Zr的价格比Sc便宜很多,采用Sc和Zr复合微合金化可减少铝合金中Sc的加入量,从而降低合金的成本.
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