Evaluating dealloying as a precursor to stress corrosion cracking: a micro-mechanical testing approach
Abstract Dealloying (selective dissolution) results in the formation of a (nano)porous film which has been proposed to act as a precursor to stress corrosion cracking (SCC) by a cleavage mechanism. The geometry of this film (e.g., ligament size and thickness) influences its ability to act as a precu...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2025-06-01
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| Series: | npj Materials Degradation |
| Online Access: | https://doi.org/10.1038/s41529-025-00621-7 |
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| author | Hooman Gholamzadeh Kevin Daub Mark R. Daymond Suraj Y. Persaud |
| author_facet | Hooman Gholamzadeh Kevin Daub Mark R. Daymond Suraj Y. Persaud |
| author_sort | Hooman Gholamzadeh |
| collection | DOAJ |
| description | Abstract Dealloying (selective dissolution) results in the formation of a (nano)porous film which has been proposed to act as a precursor to stress corrosion cracking (SCC) by a cleavage mechanism. The geometry of this film (e.g., ligament size and thickness) influences its ability to act as a precursor. This study investigates the micro-scale mechanical response of a dealloyed layer formed on Alloy 800 when exposed to boiling 50 wt% NaOH solution. Post-exposure in-SEM tensile and micro-cantilever bending tests were conducted on porous films of different geometries, formed after 2, 18 and 24 h of exposure. Results indicate that a porous dealloyed layer is more brittle compared to the base material and SCC can be induced, even with the corrosive environment removed. Increasing the time of exposure coarsened ligaments resulting in increased ductility of the porous film. In contrast, increasing the strain rate resulted in the porous film shifting towards brittle failure. |
| format | Article |
| id | doaj-art-59b6c366daaa40419c65283c4edc1b71 |
| institution | Kabale University |
| issn | 2397-2106 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Materials Degradation |
| spelling | doaj-art-59b6c366daaa40419c65283c4edc1b712025-08-20T03:47:17ZengNature Portfolionpj Materials Degradation2397-21062025-06-019111210.1038/s41529-025-00621-7Evaluating dealloying as a precursor to stress corrosion cracking: a micro-mechanical testing approachHooman Gholamzadeh0Kevin Daub1Mark R. Daymond2Suraj Y. Persaud3Department of Mechanical and Materials Engineering, Smith Engineering, Queen’s UniversityDepartment of Mechanical and Materials Engineering, Smith Engineering, Queen’s UniversityDepartment of Mechanical and Materials Engineering, Smith Engineering, Queen’s UniversityDepartment of Mechanical and Materials Engineering, Smith Engineering, Queen’s UniversityAbstract Dealloying (selective dissolution) results in the formation of a (nano)porous film which has been proposed to act as a precursor to stress corrosion cracking (SCC) by a cleavage mechanism. The geometry of this film (e.g., ligament size and thickness) influences its ability to act as a precursor. This study investigates the micro-scale mechanical response of a dealloyed layer formed on Alloy 800 when exposed to boiling 50 wt% NaOH solution. Post-exposure in-SEM tensile and micro-cantilever bending tests were conducted on porous films of different geometries, formed after 2, 18 and 24 h of exposure. Results indicate that a porous dealloyed layer is more brittle compared to the base material and SCC can be induced, even with the corrosive environment removed. Increasing the time of exposure coarsened ligaments resulting in increased ductility of the porous film. In contrast, increasing the strain rate resulted in the porous film shifting towards brittle failure.https://doi.org/10.1038/s41529-025-00621-7 |
| spellingShingle | Hooman Gholamzadeh Kevin Daub Mark R. Daymond Suraj Y. Persaud Evaluating dealloying as a precursor to stress corrosion cracking: a micro-mechanical testing approach npj Materials Degradation |
| title | Evaluating dealloying as a precursor to stress corrosion cracking: a micro-mechanical testing approach |
| title_full | Evaluating dealloying as a precursor to stress corrosion cracking: a micro-mechanical testing approach |
| title_fullStr | Evaluating dealloying as a precursor to stress corrosion cracking: a micro-mechanical testing approach |
| title_full_unstemmed | Evaluating dealloying as a precursor to stress corrosion cracking: a micro-mechanical testing approach |
| title_short | Evaluating dealloying as a precursor to stress corrosion cracking: a micro-mechanical testing approach |
| title_sort | evaluating dealloying as a precursor to stress corrosion cracking a micro mechanical testing approach |
| url | https://doi.org/10.1038/s41529-025-00621-7 |
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