Effect of Retrogression Heat Treatment Time on Microstructure and Mechanical Properties of AA7010

Nandana, MS and Udaya Bhat, K and Manjunatha, CM (2018) Effect of Retrogression Heat Treatment Time on Microstructure and Mechanical Properties of AA7010. Journal of Materials Engineering and Performance, 27 (4). pp. 1628-1634. ISSN 10599495

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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.

Item Type: Article
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
CHEMISTRY AND MATERIALS > Metals and Metallic Materials
ENGINEERING > Structural Mechanics
Depositing User: Mrs SK Pratibha
Date Deposited: 05 Jul 2019 15:51
Last Modified: 05 Jul 2019 15:51
URI: http://nal-ir.nal.res.in/id/eprint/13171

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