Improved fatigue crack growth resistance by retrogression and re-aging heat treatment in 7010 aluminum alloy

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dc.contributor.authorNandana, M.S.
dc.contributor.authorBhat K, U.K.
dc.contributor.authorManjunatha, C.M.
dc.date.accessioned2026-02-05T09:30:18Z
dc.date.issued2019
dc.description.abstractAircraft grade 7010 aluminum alloy was heat treated to two different conditions: (1) standard peak aging (T6) and (2) retrogression and re-aging (RRA). The microstructures of these alloys were characterized by using transmission electron microscope. Fatigue crack growth rate (FCGR) tests were conducted using standard compact tension specimens, following ASTM standards. Tests were conducted at various stress ratios, R ranging from 0.1 to 0.7. The RRA-treated alloy was observed to contain coarsened ?? (MgZn<inf>2</inf>) precipitates with higher inter-particle spacing when compared with T6-treated alloy. The grain boundary precipitates (GBPs) were also coarsened and discontinuous in RRA-treated alloy as compared with continuous GBPs in T6 condition. The FCGR was lower and ?K<inf>th</inf> was higher in RRA-treated alloy compared with T6-treated alloy at all the stress ratios investigated. Improved fatigue crack growth resistance in RRA-treated alloy was correlated to the modified microstructure and enhanced crack closure levels. © 2018 Wiley Publishing Ltd.
dc.identifier.citationFatigue and Fracture of Engineering Materials and Structures, 2019, 42, 3, pp. 719-731
dc.identifier.issn8756758X
dc.identifier.urihttps://doi.org/10.1111/ffe.12946
dc.identifier.urihttps://idr.nitk.ac.in/handle/123456789/24673
dc.publisherBlackwell Publishing Ltd
dc.subjectASTM standards
dc.subjectBinary alloys
dc.subjectCrack closure
dc.subjectFatigue crack propagation
dc.subjectFatigue of materials
dc.subjectGrain boundaries
dc.subjectGrowth rate
dc.subjectHeat resistance
dc.subjectHeat treatment
dc.subjectMagnesium alloys
dc.subjectMicrostructure
dc.subjectTransmission electron microscopy
dc.subjectZinc alloys
dc.subject7010 Aluminum alloy
dc.subjectCompact tension specimen
dc.subjectCrack closure levels
dc.subjectGrain boundary precipitate
dc.subjectInter-particle spacing
dc.subjectNear thresholds
dc.subjectretrogression
dc.subjectRetrogression and reaging
dc.subjectAluminum alloys
dc.titleImproved fatigue crack growth resistance by retrogression and re-aging heat treatment in 7010 aluminum alloy

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