دورية أكاديمية
Ductile-brittle transition at edge cracks (001)[110] in BCC iron under different loading rates in mode I: a 3D atomistic study
| العنوان: | Ductile-brittle transition at edge cracks (001)[110] in BCC iron under different loading rates in mode I: a 3D atomistic study |
|---|---|
| المؤلفون: | Alena Uhnáková, Anna Machová, Jan Červ, Petr Hora, Jaroslav Joch |
| المصدر: | Materials Research Express, Vol 9, Iss 3, p 036508 (2022) |
| بيانات النشر: | IOP Publishing, 2022. |
| سنة النشر: | 2022 |
| المجموعة: | LCC:Materials of engineering and construction. Mechanics of materials LCC:Chemical technology |
| مصطلحات موضوعية: | bcc iron, cracks, ductile-brittle transition, molecular dynamics, loading rate effect, Materials of engineering and construction. Mechanics of materials, TA401-492, Chemical technology, TP1-1185 |
| الوصف: | 3D atomistic simulations via molecular dynamics ( MD) at temperature of 0 K and 295 K (22 °C) with a high quasi-static loading rate dP/dt of 2.92 kN s ^−1 show that cleavage fracture is supported by surface emission of oblique dislocations $\left\langle 11\bar{1}\right\rangle \left\{011\right\}$ and by their subsequent cross slip to {112} planes, which increases separation of the (001) cleavage planes inside the crystal. Under the slower loading rate by a factor 5, the crack growth is hindered by twin generation on oblique planes {112} and the fracture is ductile. The MD results explain the contribution of the crack itself to the ductile-brittle transition observed in our fracture experiments on Fe-3wt%Si single crystals of the same orientation and geometry, loaded at the same rates dP/dt as in MD . The loading rates are equivalent to the cross head speed of 5 mm min ^−1 and 1 mm min ^−1 used in the experiment. The MD results also agree with the stress analysis performed by the anisotropic LFM and comply with experimental observations. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 2053-1591 |
| Relation: | https://doaj.org/toc/2053-1591 |
| DOI: | 10.1088/2053-1591/ac5708 |
| URL الوصول: | https://doaj.org/article/34c70edad4284715be90844417735790 |
| رقم الأكسشن: | edsdoj.34c70edad4284715be90844417735790 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 20531591 |
|---|---|
| DOI: | 10.1088/2053-1591/ac5708 |