Dependence of deuterium retention and surface blistering on deuterium plasma exposure temperature and fluence in lanthanum oxide doped tungsten
Oxide dispersion strengthened tungsten (ODS-W) is a potential candidate for plasma-facing materials (PFMs) in future fusion reactors. In this work, deuterium (D) retention and surface blistering in W-1 wt% La2O3 (W-La2O3) have been investigated after exposure to low-energy (40 eV) D plasma with vari...
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| Format: | Article |
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Elsevier
2022-09-01
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| Series: | Nuclear Materials and Energy |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352179122001016 |
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| author | Yuhan Sun Shiwei Wang Chen Li Wangguo Guo Yue Yuan Hong Zhang Peng Wang Long Cheng Guang-Hong Lu |
| author_facet | Yuhan Sun Shiwei Wang Chen Li Wangguo Guo Yue Yuan Hong Zhang Peng Wang Long Cheng Guang-Hong Lu |
| author_sort | Yuhan Sun |
| collection | DOAJ |
| description | Oxide dispersion strengthened tungsten (ODS-W) is a potential candidate for plasma-facing materials (PFMs) in future fusion reactors. In this work, deuterium (D) retention and surface blistering in W-1 wt% La2O3 (W-La2O3) have been investigated after exposure to low-energy (40 eV) D plasma with various exposure temperatures (400–600 K) and fluences (3.6 × 1024–1.4 × 1025 D/m2). Surface blistering and D retention exhibit a strong dependence on the exposure temperature and fluence. The most pronounced effect is found at 500 K. The blister-induced defects including dislocations and vacancies are considered to dominate the D retention. At 400 K and 600 K, the D retained in W-La2O3 is governed by unique intrinsic defects including interfaces, micro-pores, and unoxidized La particles. Regarding the exposure fluence, as expected, surface blistering and D retention are positively correlated with it, in which two dominant stages of nucleation and growth for blistering are identified from the changes in area density and size of blisters. Based on the results obtained from W-La2O3, comparisons with W are performed with the exposure condition (500 K, 1.4 × 1025 D/m2) where the blistering and D retention is most pronounced. Although the area density of blisters is similar between the two materials, the average size of blisters is larger in W-La2O3. Notably, an additional high-temperature D desorption shoulder appears in the release spectra of W-La2O3, which is probably due to the particular defects such as interfaces, micro-pores and La particles, and finally resulting in a higher D retention in W-La2O3 than that in W. |
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| issn | 2352-1791 |
| language | English |
| last_indexed | 2024-04-14T02:04:33Z |
| publishDate | 2022-09-01 |
| publisher | Elsevier |
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| series | Nuclear Materials and Energy |
| spelling | doaj.art-5795254a6c314a77aacce690b9e6741f2022-12-22T02:18:43ZengElsevierNuclear Materials and Energy2352-17912022-09-0132101217Dependence of deuterium retention and surface blistering on deuterium plasma exposure temperature and fluence in lanthanum oxide doped tungstenYuhan Sun0Shiwei Wang1Chen Li2Wangguo Guo3Yue Yuan4Hong Zhang5Peng Wang6Long Cheng7Guang-Hong Lu8School of Physics, Beihang University, Beijing 100191, China; Beijing Key Laboratory of Advanced Nuclear Materials and Physics, Beihang University, Beijing 100191, ChinaSchool of Physics, Beihang University, Beijing 100191, China; Beijing Key Laboratory of Advanced Nuclear Materials and Physics, Beihang University, Beijing 100191, ChinaSchool of Physics, Beihang University, Beijing 100191, China; Beijing Key Laboratory of Advanced Nuclear Materials and Physics, Beihang University, Beijing 100191, ChinaInstitute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, ChinaSchool of Physics, Beihang University, Beijing 100191, China; Beijing Key Laboratory of Advanced Nuclear Materials and Physics, Beihang University, Beijing 100191, China; Corresponding author at: School of Physics, Beihang University, Beijing 100191, China.State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, ChinaState Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, ChinaSchool of Physics, Beihang University, Beijing 100191, China; Beijing Key Laboratory of Advanced Nuclear Materials and Physics, Beihang University, Beijing 100191, ChinaSchool of Physics, Beihang University, Beijing 100191, China; Beijing Key Laboratory of Advanced Nuclear Materials and Physics, Beihang University, Beijing 100191, ChinaOxide dispersion strengthened tungsten (ODS-W) is a potential candidate for plasma-facing materials (PFMs) in future fusion reactors. In this work, deuterium (D) retention and surface blistering in W-1 wt% La2O3 (W-La2O3) have been investigated after exposure to low-energy (40 eV) D plasma with various exposure temperatures (400–600 K) and fluences (3.6 × 1024–1.4 × 1025 D/m2). Surface blistering and D retention exhibit a strong dependence on the exposure temperature and fluence. The most pronounced effect is found at 500 K. The blister-induced defects including dislocations and vacancies are considered to dominate the D retention. At 400 K and 600 K, the D retained in W-La2O3 is governed by unique intrinsic defects including interfaces, micro-pores, and unoxidized La particles. Regarding the exposure fluence, as expected, surface blistering and D retention are positively correlated with it, in which two dominant stages of nucleation and growth for blistering are identified from the changes in area density and size of blisters. Based on the results obtained from W-La2O3, comparisons with W are performed with the exposure condition (500 K, 1.4 × 1025 D/m2) where the blistering and D retention is most pronounced. Although the area density of blisters is similar between the two materials, the average size of blisters is larger in W-La2O3. Notably, an additional high-temperature D desorption shoulder appears in the release spectra of W-La2O3, which is probably due to the particular defects such as interfaces, micro-pores and La particles, and finally resulting in a higher D retention in W-La2O3 than that in W.http://www.sciencedirect.com/science/article/pii/S2352179122001016Lanthanum oxide doped tungstenSurface blisteringDeuterium retentionExposure temperatureExposure fluence |
| spellingShingle | Yuhan Sun Shiwei Wang Chen Li Wangguo Guo Yue Yuan Hong Zhang Peng Wang Long Cheng Guang-Hong Lu Dependence of deuterium retention and surface blistering on deuterium plasma exposure temperature and fluence in lanthanum oxide doped tungsten Nuclear Materials and Energy Lanthanum oxide doped tungsten Surface blistering Deuterium retention Exposure temperature Exposure fluence |
| title | Dependence of deuterium retention and surface blistering on deuterium plasma exposure temperature and fluence in lanthanum oxide doped tungsten |
| title_full | Dependence of deuterium retention and surface blistering on deuterium plasma exposure temperature and fluence in lanthanum oxide doped tungsten |
| title_fullStr | Dependence of deuterium retention and surface blistering on deuterium plasma exposure temperature and fluence in lanthanum oxide doped tungsten |
| title_full_unstemmed | Dependence of deuterium retention and surface blistering on deuterium plasma exposure temperature and fluence in lanthanum oxide doped tungsten |
| title_short | Dependence of deuterium retention and surface blistering on deuterium plasma exposure temperature and fluence in lanthanum oxide doped tungsten |
| title_sort | dependence of deuterium retention and surface blistering on deuterium plasma exposure temperature and fluence in lanthanum oxide doped tungsten |
| topic | Lanthanum oxide doped tungsten Surface blistering Deuterium retention Exposure temperature Exposure fluence |
| url | http://www.sciencedirect.com/science/article/pii/S2352179122001016 |
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