UPSpace will be temporarily unavailable tonight from 19:00 to 23:00 (South African Time) due to scheduled maintenance. We apologise for any inconvenience this may cause and appreciate your understanding
 

The crack growth resistance behaviour of aluminium alloy 2024-T3 at slow strain rates after exposure to standard corrosive environments

dc.contributor.authorPretorius, Christiaan C.E.
dc.contributor.authorMostert, Roelf Johannes
dc.contributor.authorRamjee, Shatish
dc.date.accessioned2022-05-06T10:28:32Z
dc.date.available2022-05-06T10:28:32Z
dc.date.issued2021-04
dc.description.abstractThe study investigates the effect of prior corrosive exposure on crack growth resistance behaviour of thin sheet (3 mm thick) aluminium alloy 2024-T3 at slow strain rates. Compact tension specimens were exposed to standard corrosive environments that simulate accelerated atmospheric corrosion attack. Two corrosive environments were considered – an exfoliation corrosion (EXCO) solution and a 3.5 wt% sodium chloride solution. The unloading compliance R-curves of the two-hour EXCO-exposed specimens revealed a significant degradation of approximately 11% in the crack growth resistance behaviour (Kc_e values) compared to the baseline (air-exposed) values. Furthermore, secondary intergranular crack formation was also revealed in the plastic zone ahead of, and adjacent to, the crack tip of these specimens; which formed during the crack growth resistance loading. It is postulated that the observed degradation of the Kc_e values of the EXCO-exposed material is due to hydrogen embrittlement since the exposure times for the EXCO evaluation were limited to ensure that uniform corrosion dominated; that is, significant penetration of corrosion damage and pitting due to localized corrosive attack did not occur. The sodium chloride-exposed specimens revealed a similar degradation (13%) after 24 hours exposure. However, slight intergranular corrosive attack and isolated pitting were observed on the exposed surfaces prior to crack growth resistance loading, resulting in notch effects that could assist in crack growth. Pitting and intergranular corrosion were, however, not observed at the pre-crack tip. The relative contributions of the notch effects and the hydrogen embrittlement during the degradation of the KR performance are, therefore, unclear.en_US
dc.description.departmentMaterials Science and Metallurgical Engineeringen_US
dc.description.librarianam2022en_US
dc.description.sponsorshipThe Light Metals Development Network of the Department of Science and Innovationen_US
dc.description.urihttp://www.saimm.co.za/journal-papersen_US
dc.identifier.citationPretorius, C.C., Mostert, R.J., and Ramjee, S. 2021 The crack growth resistance behaviour of aluminium alloy 2024-T3 at slow strain rates after exposure to standard corrosive environments. Journal of the Southern African Institute of Mining and Metallurgy, vol. 121, no. 4, pp. 151–158. DOI ID: http://dx.DOI.org/10.17159/2411-9717/1340/2021.en_US
dc.identifier.issn0038-223X (print)
dc.identifier.issn2225-6253 (online)
dc.identifier.other10.17159/2411-9717/1340/2021
dc.identifier.urihttps://repository.up.ac.za/handle/2263/85134
dc.language.isoenen_US
dc.publisherSouthern African Institute of Mining and Metallurgyen_US
dc.rights© The Southern African Institute of Mining and Metallurgy, 2021en_US
dc.subjectCorrosionen_US
dc.subjectCrack growthen_US
dc.subjectAluminium alloy 2024-T3en_US
dc.subject.otherEngineering, built environment and information technology articles SDG-09
dc.subject.otherSDG-09: Industry, innovation and infrastructure
dc.subject.otherEngineering, built environment and information technology articles SDG-12
dc.subject.otherSDG-12: Responsible consumption and production
dc.titleThe crack growth resistance behaviour of aluminium alloy 2024-T3 at slow strain rates after exposure to standard corrosive environmentsen_US
dc.typeArticleen_US

Files

Original bundle

Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
Pretorius_Crack_2021.pdf
Size:
2.27 MB
Format:
Adobe Portable Document Format
Description:
Article

License bundle

Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
license.txt
Size:
1.75 KB
Format:
Item-specific license agreed upon to submission
Description: