通过拉伸测试和透射电镜研究了Al-5.3Cu-0.8Mg合金中Ag的合金化作用.结果表明,合金中加入少量Ag元素后,改善了合金时效硬化特性,使合金高温力学性能得到较大提高.合金耐热性能提高原因在于Ag的加入改变了合金时效过程,析出了一种新的片状Ω相.Ag原子在{111}α面的层错中偏聚以及Ag和Mg的强烈作用形成的Ag-Mg-cluster对Cu原子的扩散作用,为Ω相形核提供了结构和成分条件.
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