Fast low-temperature irradiation creep driven by athermal defect dynamics
Fuente:
arXiv
Guardado en:
| Autores principales: | , , , , , , , , , |
|---|---|
| Formato: | Preprint |
| Publicado: |
2024
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1866914651192688640 |
|---|---|
| author | Feichtmayer, Alexander Boleininger, Max Riesch, Johann Mason, Daniel R. Reali, Luca Höschen, Till Fuhr, Maximilian Schwarz-Selinger, Thomas Neu, Rudolf Dudarev, Sergei L. |
| author_facet | Feichtmayer, Alexander Boleininger, Max Riesch, Johann Mason, Daniel R. Reali, Luca Höschen, Till Fuhr, Maximilian Schwarz-Selinger, Thomas Neu, Rudolf Dudarev, Sergei L. |
| contents | The occurrence of high stress concentrations in reactor components is a still intractable phenomenon encountered in fusion reactor design. We observe and quantitatively model a non-linear high-dose radiation mediated microstructure evolution effect that facilitates fast stress relaxation in the most challenging low-temperature limit. In situ observations of a tensioned tungsten wire exposed to a high-energy ion beam show that internal stress of up to 2 GPa relaxes within minutes, with the extent and time-scale of relaxation accurately predicted by a parameter-free multiscale model informed by atomistic simulations. As opposed to conventional notions of radiation creep, the effect arises from the self-organisation of nanoscale crystal defects, athermally coalescing into extended polarized dislocation networks that compensate and alleviate the external stress. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_13385 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Fast low-temperature irradiation creep driven by athermal defect dynamics Feichtmayer, Alexander Boleininger, Max Riesch, Johann Mason, Daniel R. Reali, Luca Höschen, Till Fuhr, Maximilian Schwarz-Selinger, Thomas Neu, Rudolf Dudarev, Sergei L. Materials Science Mesoscale and Nanoscale Physics The occurrence of high stress concentrations in reactor components is a still intractable phenomenon encountered in fusion reactor design. We observe and quantitatively model a non-linear high-dose radiation mediated microstructure evolution effect that facilitates fast stress relaxation in the most challenging low-temperature limit. In situ observations of a tensioned tungsten wire exposed to a high-energy ion beam show that internal stress of up to 2 GPa relaxes within minutes, with the extent and time-scale of relaxation accurately predicted by a parameter-free multiscale model informed by atomistic simulations. As opposed to conventional notions of radiation creep, the effect arises from the self-organisation of nanoscale crystal defects, athermally coalescing into extended polarized dislocation networks that compensate and alleviate the external stress. |
| title | Fast low-temperature irradiation creep driven by athermal defect dynamics |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2401.13385 |