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Title: Effect of Retrogression Heat Treatment Time on Microstructure and Mechanical Properties of AA7010
Authors: Nandana, M.S.
Udaya, Bhat, K.
Manjunatha, C.M.
Issue Date: 2018
Citation: Journal of Materials Engineering and Performance, 2018, Vol.27, 4, pp.1628-1634
Abstract: The effect of retrogression time during retrogression and re-aging (RRA) treatment of AA7010 is evaluated by performing tensile tests and characterizing the microchemistry of the grain boundary precipitates (GBPs) using transmission electron microscope coupled with the energy-dispersive spectroscopy. Retrogression time is evaluated so that the ultimate tensile strength of the RRA-treated sample is equal to that of the T6-treated sample and the grain boundary microstructure similar to that of the over-aged (T7451) condition. The investigation reveals that the sample retrogressed at 200 C for 20 min has UTS of 586 MPa which is equivalent to that of the T6 sample and 11.5% higher than that of the T7451 condition. The fracture toughness of the RRA-treated sample was 41 MPa?m. Microstructure of the RRA-treated sample is similar to T7451, along the grain boundaries and in the grain interior similar to that of the T6-treated sample. Energy-dispersive spectroscopy confirmed the increment of Cu content on the GBP s with increase in the retrogression time, which is expected to improve the stress corrosion cracking resistance of the alloy. 2018, ASM International.
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