Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 27    No. 11    November 2017

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Properties of AA7075 aluminum alloy in aging and retrogression and reaging process

Department of Metallurgical and Materials Engineering, Faculty of Chemistry and Metallurgical Engineering, Yildiz Technical University, Davutpasa-Esenler, Istanbul, 34210, Turkey

Abstract:A retrogression process was applied to AA7075 alloy at 180, 240 and 320 °C for 1, 30, 50, 70, 90 and 120 min. After the retrogression, aging treatment was reapplied with T6 conditions (120 °C, 24 h). The mechanical properties of aged samples were determined by V-Charpy and hardness tests and also, physical properties of samples were determined by electrical conductivity tests. Moreover, microstructural properties were characterized by light microscope and transmission electron microscope. The results show that the effects of the temperature and the duration of the retrogression and reagent on the impact toughness and hardness are related to the precipitates at the grain boundary.


Key words: aluminum alloy; precipitate behavior; retrogression and reaging; impact toughness; hardness; electrical conductivity

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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