Hydrogenated vacancies lock dislocations in aluminium
Due to its high diffusivity, hydrogen is often considered a weak inhibitor or even a promoter of dislocation movements in metals and alloys. By quantitative mechanical tests in an environmental transmission electron microscope, here we demonstrate that after exposing aluminium to hydrogen, mobile di...
| Main Authors: | , , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
Nature Publishing Group
2017
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| Online Access: | http://hdl.handle.net/1721.1/107837 https://orcid.org/0000-0002-7841-8058 |
| _version_ | 1826208616233828352 |
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| author | Xie, Degang Li, Suzhi Li, Meng Wang, Zhangjie Gumbsch, Peter Ma, Evan Li, Ju Shan, Zhiwei Sun, Jun, 1975- |
| author2 | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Xie, Degang Li, Suzhi Li, Meng Wang, Zhangjie Gumbsch, Peter Ma, Evan Li, Ju Shan, Zhiwei Sun, Jun, 1975- |
| author_sort | Xie, Degang |
| collection | MIT |
| description | Due to its high diffusivity, hydrogen is often considered a weak inhibitor or even a promoter of dislocation movements in metals and alloys. By quantitative mechanical tests in an environmental transmission electron microscope, here we demonstrate that after exposing aluminium to hydrogen, mobile dislocations can lose mobility, with activating stress more than doubled. On degassing, the locked dislocations can be reactivated under cyclic loading to move in a stick-slip manner. However, relocking the dislocations thereafter requires a surprisingly long waiting time of ∼10[superscript 3] s, much longer than that expected from hydrogen interstitial diffusion. Both the observed slow relocking and strong locking strength can be attributed to superabundant hydrogenated vacancies, verified by our atomistic calculations. Vacancies therefore could be a key plastic flow localization agent as well as damage agent in hydrogen environment. |
| first_indexed | 2024-09-23T14:08:26Z |
| format | Article |
| id | mit-1721.1/107837 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T14:08:26Z |
| publishDate | 2017 |
| publisher | Nature Publishing Group |
| record_format | dspace |
| spelling | mit-1721.1/1078372023-02-26T03:31:06Z Hydrogenated vacancies lock dislocations in aluminium Xie, Degang Li, Suzhi Li, Meng Wang, Zhangjie Gumbsch, Peter Ma, Evan Li, Ju Shan, Zhiwei Sun, Jun, 1975- Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Xie, Degang Li, Suzhi Li, Ju Due to its high diffusivity, hydrogen is often considered a weak inhibitor or even a promoter of dislocation movements in metals and alloys. By quantitative mechanical tests in an environmental transmission electron microscope, here we demonstrate that after exposing aluminium to hydrogen, mobile dislocations can lose mobility, with activating stress more than doubled. On degassing, the locked dislocations can be reactivated under cyclic loading to move in a stick-slip manner. However, relocking the dislocations thereafter requires a surprisingly long waiting time of ∼10[superscript 3] s, much longer than that expected from hydrogen interstitial diffusion. Both the observed slow relocking and strong locking strength can be attributed to superabundant hydrogenated vacancies, verified by our atomistic calculations. Vacancies therefore could be a key plastic flow localization agent as well as damage agent in hydrogen environment. 2017-04-04T15:17:06Z 2017-04-04T15:17:06Z 2016-11 2016-02 Article http://purl.org/eprint/type/JournalArticle 2041-1723 http://hdl.handle.net/1721.1/107837 Xie, Degang, Suzhi Li, Meng Li, Zhangjie Wang, Peter Gumbsch, Jun Sun, Evan Ma, Ju Li, and Zhiwei Shan. “Hydrogenated Vacancies Lock Dislocations in Aluminium.” Nature Communications 7 (November 3, 2016): 13341. https://orcid.org/0000-0002-7841-8058 en_US http://dx.doi.org/10.1038/ncomms13341 Nature Communications Creative Commons Attribution 4.0 International License http://creativecommons.org/licenses/by/4.0/ application/pdf Nature Publishing Group Nature |
| spellingShingle | Xie, Degang Li, Suzhi Li, Meng Wang, Zhangjie Gumbsch, Peter Ma, Evan Li, Ju Shan, Zhiwei Sun, Jun, 1975- Hydrogenated vacancies lock dislocations in aluminium |
| title | Hydrogenated vacancies lock dislocations in aluminium |
| title_full | Hydrogenated vacancies lock dislocations in aluminium |
| title_fullStr | Hydrogenated vacancies lock dislocations in aluminium |
| title_full_unstemmed | Hydrogenated vacancies lock dislocations in aluminium |
| title_short | Hydrogenated vacancies lock dislocations in aluminium |
| title_sort | hydrogenated vacancies lock dislocations in aluminium |
| url | http://hdl.handle.net/1721.1/107837 https://orcid.org/0000-0002-7841-8058 |
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