The control of the aging conditions for the aluminium alloys has been considered as an effective strategy to improve the properties of the alloy, especially in enhancement of the corrosion resistance. In this study, a detailed investigation of the effect of one-stage (T6) and two-stage (T76x) aging temper on mechanical properties, exfoliation and intergranular corrosion behaviours of 7075 Al–Zn–Mg–Cu alloy was implemented. Microstructures of the aged alloys were observed by optical microscopy and scanning electron microscopy (SEM), exfoliation and intergranular corrosion behaviours were investigated according to ASTM G34-2001 and ASTM G110-1992, respectively; the mechanical properties of the aged alloys were determined followed the standard methods. The microstructures of the sample aged with the T6 temper showed the finer particle size of precipitates than that of obtained from T76x tempers. Additionally, while the T6-aged sample revealed no appearance of the Precipitate Free Z...

中文翻译：

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7075 Al–Zn–Mg–Cu合金的纳米结构相，力学性能，剥落和晶间腐蚀行为–一阶段和两阶段时效过程的影响

控制铝合金的时效条件已被认为是改善合金性能的有效策略，特别是在提高耐腐蚀性方面。在这项研究中，对7075 Al–Zn–Mg–Cu合金的一阶段（T6）和两阶段（T76x）时效温度对力学性能，剥落和晶间腐蚀行为的影响进行了详细研究。通过光学显微镜和扫描电子显微镜（SEM）观察时效合金的显微组织，分别根据ASTM G34-2001和ASTM G110-1992研究剥落和晶间腐蚀行为。按照标准方法测定时效合金的机械性能。与T6x回火相比，经T6回火时效的样品的显微组织显示出更细的沉淀物粒径。此外，虽然T6年龄的样品未显示出沉淀游离Z的外观。