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Journal of Materials Engineering and Performance

Published in:

06-03-2018

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

Authors: M. S. Nandana, K. Udaya Bhat, C. M. Manjunatha

Published in: Journal of Materials Engineering and Performance | Issue 4/2018

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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.

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Title: Effect of Retrogression Heat Treatment Time on Microstructure and Mechanical Properties of AA7010
Authors: M. S. Nandana
K. Udaya Bhat
C. M. Manjunatha
Publication date: 06-03-2018
Publisher: Springer US
Published in: Journal of Materials Engineering and Performance / Issue 4/2018
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-018-3268-z

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