دورية أكاديمية
TEM Observation of Loops Decorating Dislocations and Resulting Source Hardening of Neutron-Irradiated Fe-Cr Alloys
| العنوان: | TEM Observation of Loops Decorating Dislocations and Resulting Source Hardening of Neutron-Irradiated Fe-Cr Alloys |
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| المؤلفون: | Bergner, Frank, Hernández-Mayoral, Mercedes, Heintze, Cornelia, Konstantinović, Milan J., Malerba, Lorenzo, Pareige, Cristelle |
| سنة النشر: | 2020 |
| المجموعة: | Zenodo |
| مصطلحات موضوعية: | iron–chromium alloy, neutron irradiation, hardening, tensile test, dislocation loop, TEM |
| الوصف: | Several open issues remain concerning the quantitative understanding of irradiation hardening in high-Cr steels. One of these issues is addressed here by correlating yield points that are observed in stress–strain curves with dislocation decoration observed by TEM for neutron-irradiated Fe–Cr alloys. It is found that both higher neutron exposure and higher Cr content promote irradiation-induced loops to arrange preferentially along dislocation lines. Consequently, the activation of dislocation sources requires unlocking from the decorating loops, thus resulting in a yield drop. This process is considered within the source hardening model as opposed to the dispersed barrier hardening model, the latter aimed to describe dislocation slip through a random array of obstacles. Microstructure-informed estimates of the unlocking stress are compared with measured values of the upper yield stress. As functions of neutron exposure, a cross-over from the dominance of dispersed-barrier hardening accompanied by smooth elastic–plastic transitions to the dominance of source hardening accompanied by yield drops is observed for Fe–9%Cr and Fe–12%Cr. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| العلاقة: | info:eu-repo/grantAgreement/EC/H2020/755039/; https://zenodo.org/communities/h2020-m4fTest; https://zenodo.org/record/3613462Test; https://doi.org/10.3390/met10010147Test; oai:zenodo.org:3613462 |
| DOI: | 10.3390/met10010147 |
| الإتاحة: | https://doi.org/10.3390/met10010147Test https://zenodo.org/record/3613462Test |
| حقوق: | info:eu-repo/semantics/openAccess ; https://creativecommons.org/licenses/by/4.0/legalcodeTest |
| رقم الانضمام: | edsbas.78D11BD |
| قاعدة البيانات: | BASE |
| DOI: | 10.3390/met10010147 |
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