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通过硬度和拉伸性能测试以及扫描电镜和透射电镜观察,研究了Al-4.5Cu-0.6Mg和Al-4.5Cu-0.6Mg-0.3Si合金在180℃下进行不同保温时间(6、10、14和18 h)的时效处理及元素Si对力学性能的影响。结果表明:随时效时间的延长,Al-4.5Cu-0.6Mg(-0.3Si)合金的硬度和强度先增大后减小,断裂伸长率明显降低;Si元素的添加使Al-4.5Cu-0.6Mg合金的硬度、强度、断裂伸长率均有明显提高,但延迟了Al-4.5Cu-0.6Mg合金达到峰时效的时间。利用SEM对Al-4.5Cu-0.6Mg(-0.3Si)合金拉伸断口形貌进行的观察表明:加入0.3%的Si元素后,Al-4.5Cu-0.6Mg合金的断裂特征由韧脆混合断裂变为韧性断裂。
The hardness and tensile properties of the Al-4.5Cu-0.6Mg and Al-4.5Cu-0.6Mg-0.3Si alloys were investigated under different temperatures (180 ℃ for 6, 10, 14) by scanning electron microscopy and transmission electron microscopy. And 18 h) aging treatment and elemental Si on the mechanical properties. The results show that with the aging time increasing, the hardness and strength of Al-4.5Cu-0.6Mg (-0.3Si) alloy first increase and then decrease, and the elongation at break decreases obviously. The addition of Si can make Al-4.5Cu- 0.6Mg alloy hardness, strength, elongation at break were significantly improved, but delayed the Al-4.5Cu-0.6Mg alloy peak aging time. The observation of the tensile fracture morphology of Al-4.5Cu-0.6Mg (-0.3Si) alloy by SEM shows that the fracture characteristics of Al-4.5Cu-0.6Mg alloy are composed of ductile-brittle mixed fracture Become ductile fracture.