Microstructure, oxidation behaviour and thermal shock resistance of selfpassivating W-Cr-Y-Zr alloys
Self-passivating tungsten based alloys for the first wall armor of future fusion reactors are expected to provide an important safety advantage compare to pure tungsten in case of a loss-of-coolant accident with simultaneous air ingress, due to the formation of a stable protective scale at high temp...
| Authors: | ; ; ; ; ; ; ; ; ; |
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| Format: | Article |
| Publication date: | 2020 |
| Country: | España |
| Institution: | Universidad de Navarra |
| Repository: | Dadun. Depósito Académico Digital de la Universidad de Navarra |
| Language: | English |
| OAI Identifier: | oai:dadun.unav.edu:10171/66805 |
| Online Access: | https://hdl.handle.net/10171/66805 |
| Access Level: | Open access |
| Keyword: | Self-passivating tungsten alloy Oxidation resistance Thermal shock resistance Plasma-facing materials |
| _version_ | 1878739836173549568 |
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| author | Sal, E. (Elisa)|||/items/1bd3d655-0904-4ab8-8487-74c349fe5967 |
| author2 | García-Rosales-Vázquez, C. (Carmen)|||/items/7fa31dd1-92b2-45eb-ad69-b90dda49bb01 Schlueter, K. (Karsten)|||/items/0e02a30d-3ede-4ce5-9e47-ccf56b8de85b Hunger, K. (Katja)|||/items/cef29a21-190f-406d-938a-d7c692e35c1b Gago, M. (Mauricio)|||/items/4db2d269-10ea-49c0-b769-ba9542e752ce Wirtz, M. (Marius)|||/items/b31410eb-83ee-499e-a6ae-780260c347e2 Calvo, A. (Aida)|||/items/6f7f20b4-28e4-4647-8d20-9a4f18fe343b Andueza, I. (Iñigo)|||/items/a1ea691d-6ea7-4c09-a4c4-9f71599e7bc1 Neu, R. (Rudolf)|||/items/64f3e864-1ea6-4d03-85c2-5509d3bd876e Pintsuk, G. (Gerald)|||/items/ccb8f74a-3200-4072-83cf-937b20377d6a |
| author2_role | author author author author author author author author author |
| author_browse | Andueza, I. (Iñigo)|||/items/a1ea691d-6ea7-4c09-a4c4-9f71599e7bc1 Calvo, A. (Aida)|||/items/6f7f20b4-28e4-4647-8d20-9a4f18fe343b Gago, M. (Mauricio)|||/items/4db2d269-10ea-49c0-b769-ba9542e752ce García-Rosales-Vázquez, C. (Carmen)|||/items/7fa31dd1-92b2-45eb-ad69-b90dda49bb01 Hunger, K. (Katja)|||/items/cef29a21-190f-406d-938a-d7c692e35c1b Neu, R. (Rudolf)|||/items/64f3e864-1ea6-4d03-85c2-5509d3bd876e Pintsuk, G. (Gerald)|||/items/ccb8f74a-3200-4072-83cf-937b20377d6a Sal, E. (Elisa)|||/items/1bd3d655-0904-4ab8-8487-74c349fe5967 Schlueter, K. (Karsten)|||/items/0e02a30d-3ede-4ce5-9e47-ccf56b8de85b Wirtz, M. (Marius)|||/items/b31410eb-83ee-499e-a6ae-780260c347e2 |
| author_facet | Sal, E. (Elisa)|||/items/1bd3d655-0904-4ab8-8487-74c349fe5967 García-Rosales-Vázquez, C. (Carmen)|||/items/7fa31dd1-92b2-45eb-ad69-b90dda49bb01 Schlueter, K. (Karsten)|||/items/0e02a30d-3ede-4ce5-9e47-ccf56b8de85b Hunger, K. (Katja)|||/items/cef29a21-190f-406d-938a-d7c692e35c1b Gago, M. (Mauricio)|||/items/4db2d269-10ea-49c0-b769-ba9542e752ce Wirtz, M. (Marius)|||/items/b31410eb-83ee-499e-a6ae-780260c347e2 Calvo, A. (Aida)|||/items/6f7f20b4-28e4-4647-8d20-9a4f18fe343b Andueza, I. (Iñigo)|||/items/a1ea691d-6ea7-4c09-a4c4-9f71599e7bc1 Neu, R. (Rudolf)|||/items/64f3e864-1ea6-4d03-85c2-5509d3bd876e Pintsuk, G. (Gerald)|||/items/ccb8f74a-3200-4072-83cf-937b20377d6a |
| author_role | author |
| collection | Dadun. Depósito Académico Digital de la Universidad de Navarra |
| description | Self-passivating tungsten based alloys for the first wall armor of future fusion reactors are expected to provide an important safety advantage compare to pure tungsten in case of a loss-of-coolant accident with simultaneous air ingress, due to the formation of a stable protective scale at high temperatures in presence of oxygen preventing the formation of volatile and radioactive WO3. In this work, Zr is added to self-passivating W-10Cr-0.5Y alloy, manufactured by mechanical alloying and HIP, in view of improving its mechanical strength and thus, its thermal shock resistance. The as-HIPed W-10Cr-0.5Y-0.5Zr exhibits a nanocrystalline microstructure with the presence of an extremely fine nanoparticle dispersion. After heat treatment at 1555 °C for 1.5 h, the grain size growths from less than 100 nm to 620 nm and nanoparticles are present both at the grain boundaries and inside the grains. Oxidation tests at 1000 °C revealed that the alloy with Zr exhibits also a strong oxidation reduction compared to pure W. The long-term oxidation rate is similar to that of the alloy without Zr. Under thermal shock loading simulating 1000 ELM-like pulses at the divertor, the heat treated Zr-containing alloy did not present any damage. |
| eu_rights_str_mv | openAccess |
| format | article |
| id | ES_c8de7eddfd31e567a4e97acfb7e1b06d |
| institution | Universidad de Navarra |
| instname_str | Universidad de Navarra |
| language | eng |
| network_acronym_str | ES |
| network_name_str | España |
| oai_identifier_str | oai:dadun.unav.edu:10171/66805 |
| publishDate | 2020 |
| publishDateSort | 2020 |
| reponame_str | Dadun. Depósito Académico Digital de la Universidad de Navarra |
| spelling | Microstructure, oxidation behaviour and thermal shock resistance of selfpassivating W-Cr-Y-Zr alloys Sal, E. (Elisa)|||/items/1bd3d655-0904-4ab8-8487-74c349fe5967 García-Rosales-Vázquez, C. (Carmen)|||/items/7fa31dd1-92b2-45eb-ad69-b90dda49bb01 Schlueter, K. (Karsten)|||/items/0e02a30d-3ede-4ce5-9e47-ccf56b8de85b Hunger, K. (Katja)|||/items/cef29a21-190f-406d-938a-d7c692e35c1b Gago, M. (Mauricio)|||/items/4db2d269-10ea-49c0-b769-ba9542e752ce Wirtz, M. (Marius)|||/items/b31410eb-83ee-499e-a6ae-780260c347e2 Calvo, A. (Aida)|||/items/6f7f20b4-28e4-4647-8d20-9a4f18fe343b Andueza, I. (Iñigo)|||/items/a1ea691d-6ea7-4c09-a4c4-9f71599e7bc1 Neu, R. (Rudolf)|||/items/64f3e864-1ea6-4d03-85c2-5509d3bd876e Pintsuk, G. (Gerald)|||/items/ccb8f74a-3200-4072-83cf-937b20377d6a Self-passivating tungsten alloy Oxidation resistance Thermal shock resistance Plasma-facing materials Self-passivating tungsten based alloys for the first wall armor of future fusion reactors are expected to provide an important safety advantage compare to pure tungsten in case of a loss-of-coolant accident with simultaneous air ingress, due to the formation of a stable protective scale at high temperatures in presence of oxygen preventing the formation of volatile and radioactive WO3. In this work, Zr is added to self-passivating W-10Cr-0.5Y alloy, manufactured by mechanical alloying and HIP, in view of improving its mechanical strength and thus, its thermal shock resistance. The as-HIPed W-10Cr-0.5Y-0.5Zr exhibits a nanocrystalline microstructure with the presence of an extremely fine nanoparticle dispersion. After heat treatment at 1555 °C for 1.5 h, the grain size growths from less than 100 nm to 620 nm and nanoparticles are present both at the grain boundaries and inside the grains. Oxidation tests at 1000 °C revealed that the alloy with Zr exhibits also a strong oxidation reduction compared to pure W. The long-term oxidation rate is similar to that of the alloy without Zr. Under thermal shock loading simulating 1000 ELM-like pulses at the divertor, the heat treated Zr-containing alloy did not present any damage. https://hdl.handle.net/10171/66805 |
| spellingShingle | Microstructure, oxidation behaviour and thermal shock resistance of selfpassivating W-Cr-Y-Zr alloys Sal, E. (Elisa)|||/items/1bd3d655-0904-4ab8-8487-74c349fe5967 Self-passivating tungsten alloy Oxidation resistance Thermal shock resistance Plasma-facing materials |
| title | Microstructure, oxidation behaviour and thermal shock resistance of selfpassivating W-Cr-Y-Zr alloys |
| title_full | Microstructure, oxidation behaviour and thermal shock resistance of selfpassivating W-Cr-Y-Zr alloys |
| title_fullStr | Microstructure, oxidation behaviour and thermal shock resistance of selfpassivating W-Cr-Y-Zr alloys |
| title_full_unstemmed | Microstructure, oxidation behaviour and thermal shock resistance of selfpassivating W-Cr-Y-Zr alloys |
| title_short | Microstructure, oxidation behaviour and thermal shock resistance of selfpassivating W-Cr-Y-Zr alloys |
| title_sort | Microstructure, oxidation behaviour and thermal shock resistance of selfpassivating W-Cr-Y-Zr alloys |
| topic | Self-passivating tungsten alloy Oxidation resistance Thermal shock resistance Plasma-facing materials |
| topic_facet | Self-passivating tungsten alloy Oxidation resistance Thermal shock resistance Plasma-facing materials |
| url | https://hdl.handle.net/10171/66805 |