Journal of Mining and Metallurgy, Section B: Metallurgy 2011 Volume 47, Issue 1, Pages: 31-35
https://doi.org/10.2298/JMMB1101031Z
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Properties enhancement of Al-Zn-Mg alloy by retrogression and re-aging heat treatment
Zaid H.R. (Department of Mechanical and Industrial Engineering, Al-Fateh University, Tripoli, Libya)
Hatab A.M. (Department of Material Science, Faculty of Engineering, Al-Jabal El-Gahrbi University, Garyhani, Libya)
Ibrahim A.M.A. (Department of Material Science, Faculty of Engineering, Al-Jabal El-Gahrbi University, Garyhani, Libya)
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.
Keywords: aerospace materials, 7079-T651 aluminum wrought alloy, retrogression and reaging heat treatment process, impact, electrical conductivity, and hardness
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