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通过室温拉伸、疲劳裂纹扩展速率测试及透射电镜等实验手段,研究Mg含量对Al-Cu-Mg-Ag合金时效析出过程与力学性能的影响。结果表明:随着Mg含量的增加,合金的时效响应速率加快,而强度则先上升后下降,当Cu/Mg比为6时,合金强度最高;Mg含量的提高为主要析出相?相提供了更多的形核位置,使得合金基体中的析出相细小弥散,分布均匀;Cu/Mg比接近4的合金经165℃时效30min处理后,晶内析出大量的Cu-Mg原子团簇,疲劳性能最佳。
The effects of Mg content on the precipitation process and mechanical properties of Al-Cu-Mg-Ag alloy were investigated by tensile test at room temperature, fatigue crack growth rate and transmission electron microscopy. The results show that the aging response rate increases with the increase of Mg content, but the strength first increases and then decreases. When the Cu / Mg ratio is 6, the alloy has the highest strength. The increase of Mg content provides the main precipitation phase More nucleation sites make the precipitation phase of the alloy matrix finely dispersed and distributed uniformly. When the Cu / Mg ratio is close to 4, a large amount of Cu-Mg clusters are precipitated in the grains after aging at 165 ℃ for 30 minutes, good.