Irradiation effects on binary tungsten alloys at elevated temperatures: Vacancy cluster formation, precipitation of alloying elements and irradiation hardening
Irradiation responses of binary W alloys were investigated systematically from the perspective of the binding energy of an alloying element with a W self-interstitial atom (W-SIA). Plates of W, W-0.3 at.% Cr, W-5 at.% Re, W-2.5 at.% Mo and W-5 at.% Ta alloys were irradiated at 1073 K with 6.4 MeV Fe...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-05-01
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| Series: | Materials & Design |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127523003143 |
| _version_ | 1797849775030140928 |
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| author | Jing Wang Yuji Hatano Takeshi Toyama Tatsuya Hinoki Kiyohiro Yabuuchi Yi-fan Zhang Bing Ma Alexander V. Spitsyn Nikolay P. Bobyr Koji Inoue Yasuyoshi Nagai |
| author_facet | Jing Wang Yuji Hatano Takeshi Toyama Tatsuya Hinoki Kiyohiro Yabuuchi Yi-fan Zhang Bing Ma Alexander V. Spitsyn Nikolay P. Bobyr Koji Inoue Yasuyoshi Nagai |
| author_sort | Jing Wang |
| collection | DOAJ |
| description | Irradiation responses of binary W alloys were investigated systematically from the perspective of the binding energy of an alloying element with a W self-interstitial atom (W-SIA). Plates of W, W-0.3 at.% Cr, W-5 at.% Re, W-2.5 at.% Mo and W-5 at.% Ta alloys were irradiated at 1073 K with 6.4 MeV Fe ions to 0.26 dpa at the damage peak, where the binding energy of alloying element with W-SIA is in order of Cr > Re > Mo > Ta. The formation of vacancy-type defects (vacancies and vacancy clusters) was studied by using positron lifetime measurement. The precipitation of alloying elements was studied by using atom probe tomography (APT) and the hardness changes in the irradiated volumes were measured by the nanoindentation technique. The formation of vacancy-type defects was strongly suppressed by the addition of Cr and Re, while Ta and Mo had no noticeable suppression effect. The APT measurements showed fine Cr- and Re-rich precipitates in W-0.3 at.% Cr and W-5 at.% Re alloys, respectively, where the density of precipitates in the latter was clearly lower than that in the former. The distributions of Mo and Ta were uniform even after irradiation. Irradiation hardening was observed for all materials but that of W-5 at.% Re alloy was significantly smaller than the hardening of W, W-2.5 at.% Mo and W-5 at.% Ta alloys. These observations suggest that the irradiation hardening of W, W-2.5 at.% Mo, and W-5 at.% Ta alloys were mainly caused by vacancy-type defects. It was concluded that an alloying element with moderate binding energy with a W-SIA effectively suppresses vacancy formation without significantly enhanced precipitation and consequently mitigates irradiation hardening. |
| first_indexed | 2024-04-09T18:49:36Z |
| format | Article |
| id | doaj.art-83f4f8dfc9df44fbba60386c75ca421d |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-04-09T18:49:36Z |
| publishDate | 2023-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-83f4f8dfc9df44fbba60386c75ca421d2023-04-10T04:03:41ZengElsevierMaterials & Design0264-12752023-05-01229111899Irradiation effects on binary tungsten alloys at elevated temperatures: Vacancy cluster formation, precipitation of alloying elements and irradiation hardeningJing Wang0Yuji Hatano1Takeshi Toyama2Tatsuya Hinoki3Kiyohiro Yabuuchi4Yi-fan Zhang5Bing Ma6Alexander V. Spitsyn7Nikolay P. Bobyr8Koji Inoue9Yasuyoshi Nagai10Hydrogen Isotope Research Center, Organization for Promotion of Research, University of Toyama, Toyama 930-8555, Japan; School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, ChinaHydrogen Isotope Research Center, Organization for Promotion of Research, University of Toyama, Toyama 930-8555, Japan; Corresponding author.Institute for Materials Research, Tohoku University, Oarai 311-1313, JapanOpen Innovation Institute, Kyoto University, Kyoto 606-8501, JapanInstitute of Advanced Energy, Kyoto University, Kyoto 611-0011, JapanSchool of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, ChinaSchool of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, ChinaNRC “Kurchatov Institute”, Kurchatov sq. 1, Moscow 123182, RussiaNRC “Kurchatov Institute”, Kurchatov sq. 1, Moscow 123182, RussiaInstitute for Materials Research, Tohoku University, Oarai 311-1313, JapanInstitute for Materials Research, Tohoku University, Oarai 311-1313, JapanIrradiation responses of binary W alloys were investigated systematically from the perspective of the binding energy of an alloying element with a W self-interstitial atom (W-SIA). Plates of W, W-0.3 at.% Cr, W-5 at.% Re, W-2.5 at.% Mo and W-5 at.% Ta alloys were irradiated at 1073 K with 6.4 MeV Fe ions to 0.26 dpa at the damage peak, where the binding energy of alloying element with W-SIA is in order of Cr > Re > Mo > Ta. The formation of vacancy-type defects (vacancies and vacancy clusters) was studied by using positron lifetime measurement. The precipitation of alloying elements was studied by using atom probe tomography (APT) and the hardness changes in the irradiated volumes were measured by the nanoindentation technique. The formation of vacancy-type defects was strongly suppressed by the addition of Cr and Re, while Ta and Mo had no noticeable suppression effect. The APT measurements showed fine Cr- and Re-rich precipitates in W-0.3 at.% Cr and W-5 at.% Re alloys, respectively, where the density of precipitates in the latter was clearly lower than that in the former. The distributions of Mo and Ta were uniform even after irradiation. Irradiation hardening was observed for all materials but that of W-5 at.% Re alloy was significantly smaller than the hardening of W, W-2.5 at.% Mo and W-5 at.% Ta alloys. These observations suggest that the irradiation hardening of W, W-2.5 at.% Mo, and W-5 at.% Ta alloys were mainly caused by vacancy-type defects. It was concluded that an alloying element with moderate binding energy with a W-SIA effectively suppresses vacancy formation without significantly enhanced precipitation and consequently mitigates irradiation hardening.http://www.sciencedirect.com/science/article/pii/S0264127523003143TungstenBinary tungsten alloysAtom probe tomographyPositron lifetimeNanoindentation |
| spellingShingle | Jing Wang Yuji Hatano Takeshi Toyama Tatsuya Hinoki Kiyohiro Yabuuchi Yi-fan Zhang Bing Ma Alexander V. Spitsyn Nikolay P. Bobyr Koji Inoue Yasuyoshi Nagai Irradiation effects on binary tungsten alloys at elevated temperatures: Vacancy cluster formation, precipitation of alloying elements and irradiation hardening Materials & Design Tungsten Binary tungsten alloys Atom probe tomography Positron lifetime Nanoindentation |
| title | Irradiation effects on binary tungsten alloys at elevated temperatures: Vacancy cluster formation, precipitation of alloying elements and irradiation hardening |
| title_full | Irradiation effects on binary tungsten alloys at elevated temperatures: Vacancy cluster formation, precipitation of alloying elements and irradiation hardening |
| title_fullStr | Irradiation effects on binary tungsten alloys at elevated temperatures: Vacancy cluster formation, precipitation of alloying elements and irradiation hardening |
| title_full_unstemmed | Irradiation effects on binary tungsten alloys at elevated temperatures: Vacancy cluster formation, precipitation of alloying elements and irradiation hardening |
| title_short | Irradiation effects on binary tungsten alloys at elevated temperatures: Vacancy cluster formation, precipitation of alloying elements and irradiation hardening |
| title_sort | irradiation effects on binary tungsten alloys at elevated temperatures vacancy cluster formation precipitation of alloying elements and irradiation hardening |
| topic | Tungsten Binary tungsten alloys Atom probe tomography Positron lifetime Nanoindentation |
| url | http://www.sciencedirect.com/science/article/pii/S0264127523003143 |
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