Nandana, MS and Bhat, KU and Manjunatha, CM (2019) Improved fatigue crack growth resistance by retrogression and re-aging heat treatment in 7010 aluminum alloy. Fatigue and Fracture of Engineering Materials and Structures, 42 (3). pp. 719-731. ISSN 8756758X
Full text not available from this repository.Abstract
Aircraft 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 ηʹ (MgZn2) 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 ΔKth 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
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Retrogression,Fatigue crack growth,Microstructure,Precipitation hardening |
| Subjects: | CHEMISTRY AND MATERIALS > Chemistry and Materials (General) CHEMISTRY AND MATERIALS > Composite Materials ENGINEERING > Structural Mechanics |
| Depositing User: | Smt Bhagya Rekha KA |
| Date Deposited: | 12 May 2022 10:40 |
| Last Modified: | 12 May 2022 10:40 |
| URI: | http://nal-ir.nal.res.in/id/eprint/13513 |
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