NDLI: Investigation into Corrosion Pit-to-Fatigue Crack Transition in 7075-T6 Aluminum Alloy

Content Provider	Springer Nature Link
Author	Sabelkin, V. Mall, S. Misak, H.
Copyright Year	2017
Abstract	Transition of corrosion pit to crack under fatigue condition was investigated in high-strength 7075-T6 aluminum alloy. The pit was formed at the edge of a hole in a specimen. Specimen was subjected to a constant stress during the pit formation. Two types of corrosion pit were considered: corner-pit and through-pit. Two sizes were tested for each pit type. Also, the baseline data of cycles to initiate a 250-µm-long crack were established when the corrosion pit was created without any applied stress on the specimen, i.e., S $_{appl}$ = 0. The cycles to initiate a 250-µm-long crack initially decreased with increasing S $_{appl}$ relative to the baseline value and then increased with increasing S $_{appl}$ such that this increase was significant with higher value of S $_{appl}$. The transition between this increase and decrease occurred when the S $_{appl}$ was greater or less than a value which caused the onset of plastic deformation at the root of the pit, respectively. Microstructural analysis showed that this decrease in cycles to initiate the crack was due to microcracks at the pit front which developed at the lower level of S $_{appl}$, and the increase was due to plastic deformation at the higher levels of S $_{appl}$.
Starting Page	2535
Ending Page	2541
Page Count	7
File Format	PDF
ISSN	10599495
Journal	Journal of Materials Engineering and Performance
Volume Number	26
Issue Number	6
e-ISSN	15441024
Language	English
Publisher	Springer US
Publisher Date	2017-05-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	aluminum alloy corrosion pit corrosion under load crack initiation Characterization and Evaluation of Materials Tribology, Corrosion and Coatings Quality Control, Reliability, Safety and Risk Engineering Design
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

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