通过铸锭冶金工艺,制备不同Ag含量的Al-Cu-Mg-Mn合金.采用显微观察与拉伸测试,研究其时效析出与力学性能.结果显示,Ag的添加改变了基体合金的时效析出过程,使合金的室温强度从470 MPa增大到572 MPa,300℃时的抗拉强度从95 MPa增大到217 MPa.含Ag合金在峰时效下的强化析出相由与基体共格的片状O相及少量θ'相组成.微量Ag促进Al-Cu-Mg-Mn合金强化的原因在于Ag的固溶强化和O相的沉淀硬化,其高强耐热性能主要是由于O相比θ'相具有更好的热稳定性.
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