| Title: |
Kink-Helium Interactions in Tungsten: Opposing Effects of Assisted Nucleation and Hindered Migration |
| Authors: |
Nutter, Matthew; Kermode, James R.; Bartók, Albert P. |
| Publication Year: |
2024 |
| Collection: |
ArXiv.org (Cornell University Library) |
| Subject Terms: |
Materials Science |
| Description: |
Point defects such as interstitial atoms are known to be attracted to screw dislocations. Understanding these interaction mechanisms is key to predicting the plasticity of real materials. Using a potential derived from ab initio calculations of helium in tungsten, we find that the binding of a helium atom to dislocation kinks is significantly more favorable than to a straight dislocation. This preference directly translates to a reduction in the kink pair nucleation energy, provided that the mechanism proceeds through a helium-stabilised kink. It is lowered from 1.64 eV (in the pure metal) to 0.51 eV when helium binds to the right kink. However, binding also has a competing effect whereby the kinks are unable to migrate. This hindering aspect becomes more relevant as the helium concentration increases. ; 6 pages, 4 figures |
| Document Type: |
text |
| Language: |
unknown |
| Relation: |
http://arxiv.org/abs/2406.08368 |
| Availability: |
http://arxiv.org/abs/2406.08368 |
| Accession Number: |
edsbas.760BD0CE |
| Database: |
BASE |