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dc.contributor.author | Pretorius, Christiaan C.E.![]() |
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dc.contributor.author | Mostert, Roelf Johannes![]() |
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dc.contributor.author | Ramjee, Shatish![]() |
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dc.date.accessioned | 2022-05-06T10:28:32Z | |
dc.date.available | 2022-05-06T10:28:32Z | |
dc.date.issued | 2021-04 | |
dc.description.abstract | The 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.department | Materials Science and Metallurgical Engineering | en_US |
dc.description.librarian | am2022 | en_US |
dc.description.sponsorship | The Light Metals Development Network of the Department of Science and Innovation | en_US |
dc.description.uri | http://www.saimm.co.za/journal-papers | en_US |
dc.identifier.citation | Pretorius, 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.issn | 0038-223X (print) | |
dc.identifier.issn | 2225-6253 (online) | |
dc.identifier.other | 10.17159/2411-9717/1340/2021 | |
dc.identifier.uri | https://repository.up.ac.za/handle/2263/85134 | |
dc.language.iso | en | en_US |
dc.publisher | Southern African Institute of Mining and Metallurgy | en_US |
dc.rights | © The Southern African Institute of Mining and Metallurgy, 2021 | en_US |
dc.subject | Corrosion | en_US |
dc.subject | Crack growth | en_US |
dc.subject | Aluminium alloy 2024-T3 | en_US |
dc.subject.other | Engineering, built environment and information technology articles SDG-09 | |
dc.subject.other | SDG-09: Industry, innovation and infrastructure | |
dc.subject.other | Engineering, built environment and information technology articles SDG-12 | |
dc.subject.other | SDG-12: Responsible consumption and production | |
dc.title | The crack growth resistance behaviour of aluminium alloy 2024-T3 at slow strain rates after exposure to standard corrosive environments | en_US |
dc.type | Article | en_US |