In situ TEM and multiscale study of dislocation loop formation in the vicinity of a grain boundary
Preferential formation of dislocation loops near a grain boundary (GB) in pure magnesium was observed under in-situ TEM 200 KV electron irradiation at 300 K. These loops are vacancy in nature. A rate-theory-based model is presented to explain this observation. Specifically, the model considered an i...
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| Veröffentlicht in: | Journal of nuclear materials 2020-01, Vol.528, p.151872, Article 151872 |
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| container_title | Journal of nuclear materials |
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| creator | Dong, Qingshan Saidi, Peyman Béland, Laurent K. Yao, Zhongwen Dai, Cong Daymond, Mark R. |
| description | Preferential formation of dislocation loops near a grain boundary (GB) in pure magnesium was observed under in-situ TEM 200 KV electron irradiation at 300 K. These loops are vacancy in nature. A rate-theory-based model is presented to explain this observation. Specifically, the model considered an irradiated domain surrounded by GBs and free surfaces. Molecular dynamics (MD) and finite difference methods (FDM) were combined to calibrate and solve the model. The distribution of loops with respect to the GB can be divided into three regions: 1) a defect free zone adjacent to the GB, 2) a region with vacancy loops in the distance range of 10–200 nm from the GB, and 3) a region free of extended defects far away from the GB. The characteristics of the three zones, and the vacancy nature of the loops can be explained by the relative sink strength of the GB to interstitial-type and vacancy-type defects.
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| doi_str_mv | 10.1016/j.jnucmat.2019.151872 |
| format | Article |
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[Display omitted]</description><subject>Crystal defects</subject><subject>Dislocation</subject><subject>Dislocation loops</subject><subject>Electron irradiation</subject><subject>Finite difference method</subject><subject>Finite difference methods</subject><subject>Free surfaces</subject><subject>Grain boundaries</subject><subject>Grain boundary</subject><subject>Irradiation</subject><subject>Magnesium</subject><subject>Molecular dynamics</subject><subject>Multiscale analysis</subject><subject>Radiation</subject><subject>Vacancies</subject><issn>0022-3115</issn><issn>1873-4820</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNqFkFtLAzEQhYMoWKs_QQj4vHWS7KX7JFLqBRRf6nPIVbNsk5pkC_33bt2--zTMcM6ZmQ-hWwILAqS-7xadH9RW5AUF0i5IRZYNPUOzsbCiXFI4RzMASgtGSHWJrlLqAKBqoZoh-epxcnnAm_U7Fl7j7dBnl5ToDU550AccLNYu9UGJ7ILHfQg7bEPcTq3zOH8bvHfKeZf_1AJ_RTHOZRi8FvFwjS6s6JO5OdU5-nxab1YvxdvH8-vq8a1QjDW5KEFaJknFVCtkbbSsGwLlUkKtKqmY1aBqa00rTQWESGVbYYA1oiGUKk0km6O7KXcXw89gUuZdGKIfV3LKWEmhKZtyVFWTSsWQUjSW76LbjmdyAvyIk3f8hJMfcfIJ5-h7mHxmfGHvTORJOeOV0S4albkO7p-EXy3rgf4</recordid><startdate>202001</startdate><enddate>202001</enddate><creator>Dong, Qingshan</creator><creator>Saidi, Peyman</creator><creator>Béland, Laurent K.</creator><creator>Yao, Zhongwen</creator><creator>Dai, Cong</creator><creator>Daymond, Mark R.</creator><general>Elsevier B.V</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7QQ</scope><scope>7SR</scope><scope>7ST</scope><scope>7TB</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>JG9</scope><scope>L7M</scope><scope>SOI</scope></search><sort><creationdate>202001</creationdate><title>In situ TEM and multiscale study of dislocation loop formation in the vicinity of a grain boundary</title><author>Dong, Qingshan ; Saidi, Peyman ; Béland, Laurent K. ; Yao, Zhongwen ; Dai, Cong ; Daymond, Mark R.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c337t-40bf3b153c9ab6edb671048b06c5bc3fd0c6ffe9be5011bcf9ae037a7122cd1b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Crystal defects</topic><topic>Dislocation</topic><topic>Dislocation loops</topic><topic>Electron irradiation</topic><topic>Finite difference method</topic><topic>Finite difference methods</topic><topic>Free surfaces</topic><topic>Grain boundaries</topic><topic>Grain boundary</topic><topic>Irradiation</topic><topic>Magnesium</topic><topic>Molecular dynamics</topic><topic>Multiscale analysis</topic><topic>Radiation</topic><topic>Vacancies</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Dong, Qingshan</creatorcontrib><creatorcontrib>Saidi, Peyman</creatorcontrib><creatorcontrib>Béland, Laurent K.</creatorcontrib><creatorcontrib>Yao, Zhongwen</creatorcontrib><creatorcontrib>Dai, Cong</creatorcontrib><creatorcontrib>Daymond, Mark R.</creatorcontrib><collection>CrossRef</collection><collection>Ceramic Abstracts</collection><collection>Engineered Materials Abstracts</collection><collection>Environment Abstracts</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Engineering Research Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Environment Abstracts</collection><jtitle>Journal of nuclear materials</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Dong, Qingshan</au><au>Saidi, Peyman</au><au>Béland, Laurent K.</au><au>Yao, Zhongwen</au><au>Dai, Cong</au><au>Daymond, Mark R.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>In situ TEM and multiscale study of dislocation loop formation in the vicinity of a grain boundary</atitle><jtitle>Journal of nuclear materials</jtitle><date>2020-01</date><risdate>2020</risdate><volume>528</volume><spage>151872</spage><pages>151872-</pages><artnum>151872</artnum><issn>0022-3115</issn><eissn>1873-4820</eissn><abstract>Preferential formation of dislocation loops near a grain boundary (GB) in pure magnesium was observed under in-situ TEM 200 KV electron irradiation at 300 K. These loops are vacancy in nature. A rate-theory-based model is presented to explain this observation. Specifically, the model considered an irradiated domain surrounded by GBs and free surfaces. Molecular dynamics (MD) and finite difference methods (FDM) were combined to calibrate and solve the model. The distribution of loops with respect to the GB can be divided into three regions: 1) a defect free zone adjacent to the GB, 2) a region with vacancy loops in the distance range of 10–200 nm from the GB, and 3) a region free of extended defects far away from the GB. The characteristics of the three zones, and the vacancy nature of the loops can be explained by the relative sink strength of the GB to interstitial-type and vacancy-type defects.
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| subjects | Crystal defects Dislocation Dislocation loops Electron irradiation Finite difference method Finite difference methods Free surfaces Grain boundaries Grain boundary Irradiation Magnesium Molecular dynamics Multiscale analysis Radiation Vacancies |
| title | In situ TEM and multiscale study of dislocation loop formation in the vicinity of a grain boundary |
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