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The higher strength 7xxx aluminum alloys exhibited low resistance to stress  corrosion cracking (SCC) when aged to the peak hardness (T6 temper). The  overaged alloys (T7 temper) developed to enhance the SCC with loss in the  strength of the alloy. Recently, retrogression and re-aging (RRA) heat  treatments are used for improving the SCC behavior for alloys in T6 tempers  such as 7075, 7475 and 8090. In this study, an application of retrogression  and re-aging heat treatment processes are carried out to enhance toughness  properties of the 7079-T651 aluminum alloy, while maintaining the higher  strength of T651-temper. The results of charpy impact energy and electrical  conductivity tests show a significantly increases in absorbed energy and  electrical conductivity values, when the alloys are exposed to various  retrogression temperatures (190, 200, 210°C) and times (20, 40, 60 minutes),  and then re-aged at 160°C for 18 hours

Properties enhancement of Al-Zn-Mg alloy by retrogression and re-aging heat treatment