Dislocation loop bias and void swelling in irradiated α-iron from mesoscale and atomistic simulations
Abstract Dislocation loops are ubiquitous in irradiated materials, and dislocation loop bias plays a critical role in void swelling. However, due to complicated interactions between dislocation loops and point defects, it is challenging to evaluate the bias factors of dislocation loops. Here, we det...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-05-01
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| Series: | Communications Materials |
| Online Access: | https://doi.org/10.1038/s43246-023-00356-5 |
| _version_ | 1797831992660721664 |
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| author | Ziang Yu Haixuan Xu |
| author_facet | Ziang Yu Haixuan Xu |
| author_sort | Ziang Yu |
| collection | DOAJ |
| description | Abstract Dislocation loops are ubiquitous in irradiated materials, and dislocation loop bias plays a critical role in void swelling. However, due to complicated interactions between dislocation loops and point defects, it is challenging to evaluate the bias factors of dislocation loops. Here, we determine the bias of sessile < 100 > loops in α-iron using a recently developed atomistic approach based on the lifetime of point defects. We establish a mechanistic understanding of the loop interaction based on the diffusion tendency of point defects near the loop core region. Mobile self-interstitial atoms tend to be absorbed from the edge of the loop, and a trapping region perpendicular to the habit plane of the loop exists. The dislocation loop bias is found to be substantially lower than those of straight dislocations in α-iron and should be included in swelling rate estimates. With the obtained sink strength and bias values, agreement is achieved with experimental results for both absolute values and temperature dependence. |
| first_indexed | 2024-04-09T14:01:42Z |
| format | Article |
| id | doaj.art-f25461ef2e984f34a5b1b16a93bb2082 |
| institution | Directory Open Access Journal |
| issn | 2662-4443 |
| language | English |
| last_indexed | 2024-04-09T14:01:42Z |
| publishDate | 2023-05-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Communications Materials |
| spelling | doaj.art-f25461ef2e984f34a5b1b16a93bb20822023-05-07T11:18:42ZengNature PortfolioCommunications Materials2662-44432023-05-01411910.1038/s43246-023-00356-5Dislocation loop bias and void swelling in irradiated α-iron from mesoscale and atomistic simulationsZiang Yu0Haixuan Xu1Department of Materials Science and Engineering, The University of TennesseeDepartment of Materials Science and Engineering, The University of TennesseeAbstract Dislocation loops are ubiquitous in irradiated materials, and dislocation loop bias plays a critical role in void swelling. However, due to complicated interactions between dislocation loops and point defects, it is challenging to evaluate the bias factors of dislocation loops. Here, we determine the bias of sessile < 100 > loops in α-iron using a recently developed atomistic approach based on the lifetime of point defects. We establish a mechanistic understanding of the loop interaction based on the diffusion tendency of point defects near the loop core region. Mobile self-interstitial atoms tend to be absorbed from the edge of the loop, and a trapping region perpendicular to the habit plane of the loop exists. The dislocation loop bias is found to be substantially lower than those of straight dislocations in α-iron and should be included in swelling rate estimates. With the obtained sink strength and bias values, agreement is achieved with experimental results for both absolute values and temperature dependence.https://doi.org/10.1038/s43246-023-00356-5 |
| spellingShingle | Ziang Yu Haixuan Xu Dislocation loop bias and void swelling in irradiated α-iron from mesoscale and atomistic simulations Communications Materials |
| title | Dislocation loop bias and void swelling in irradiated α-iron from mesoscale and atomistic simulations |
| title_full | Dislocation loop bias and void swelling in irradiated α-iron from mesoscale and atomistic simulations |
| title_fullStr | Dislocation loop bias and void swelling in irradiated α-iron from mesoscale and atomistic simulations |
| title_full_unstemmed | Dislocation loop bias and void swelling in irradiated α-iron from mesoscale and atomistic simulations |
| title_short | Dislocation loop bias and void swelling in irradiated α-iron from mesoscale and atomistic simulations |
| title_sort | dislocation loop bias and void swelling in irradiated α iron from mesoscale and atomistic simulations |
| url | https://doi.org/10.1038/s43246-023-00356-5 |
| work_keys_str_mv | AT ziangyu dislocationloopbiasandvoidswellinginirradiatedaironfrommesoscaleandatomisticsimulations AT haixuanxu dislocationloopbiasandvoidswellinginirradiatedaironfrommesoscaleandatomisticsimulations |