Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 153, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2021.106463
Keywords
Ultrasonic nanocrystal surface modification; Compressive residual stresses; Corrosion; Rejuvenation; Rotating-bending fatigue
Funding
- College of Engineering at The Uni-versity of Akron
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The study showed that the fatigue performance of pre-corroded 7075-T651 aluminum alloy can be rejuvenated through ultrasonic nanocrystal surface modification (UNSM), increasing the fatigue life by twenty times compared to corroded specimens. This improvement is attributed to the repair of the corroded surface layer, surface workhardening, and beneficial compressive residual stress induced by UNSM.
In this study, ultrasonic nanocrystal surface modification (UNSM) was used to rejuvenate the fatigue performance of pre-corroded 7075-T651 aluminum alloy. The fatigue life of specimens subjected to pre-corrosion and burnishing was found to be only slightly higher than that of corroded specimens, while the fatigue life of the specimens subjected to pre-corrosion and UNSM treatment was twenty times higher than that of the corroded specimens. The findings of this study demonstrate that the repair of the corroded surface layer, surface workhardening, and beneficial compressive residual stress induced by UNSM are responsible for the fatigue performance rejuvenation of the pre-corroded alloy.
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