研究了微量Sc和Ti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Ti复合微合金化可显著提高Al-Mg合金的强度.在Al-5Mg合金中,采用Sc和Ti复合微合金化可形成Al3(Sc, Ti)复合粒子,初生Al3(Sc, Ti)颗粒具有极强的细化晶粒的作用,次生Al3(Sc, Ti)质点强烈地钉扎位错和亚晶界,从而有效地抑制合金的再结晶.Sc和Ti复合微合金化还可大大促进微量Sc在Al-Mg合金中的各种强化作用.由于Ti的价格比Sc便宜很多,采用Sc和Ti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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