High temperature indentation of helium-implanted tungsten
Nanoindentation has been performed on tungsten, unimplanted and helium-implanted to ~600appm, at temperatures up to 750°C. The hardening effect of the damage was 0.90GPa at 50°C, but is negligible above 450°C. The hardness value at a given temperature did not change on re-testing after heating to 75...
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| Veröffentlicht in: | Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2015-02, Vol.625, p.380-384 |
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| container_title | Materials science & engineering. A, Structural materials : properties, microstructure and processing |
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| creator | Gibson, James S.K.-L. Roberts, Steve G. Armstrong, David E.J. |
| description | Nanoindentation has been performed on tungsten, unimplanted and helium-implanted to ~600appm, at temperatures up to 750°C. The hardening effect of the damage was 0.90GPa at 50°C, but is negligible above 450°C. The hardness value at a given temperature did not change on re-testing after heating to 750°C. This suggests that the helium is trapped in small vacancy complexes that are stable to at least 750°C, but which can be bypassed due to increased dislocation mobility (cross slip or climb) above 450°C. |
| doi_str_mv | 10.1016/j.msea.2014.12.034 |
| format | Article |
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| ispartof | Materials science & engineering. A, Structural materials : properties, microstructure and processing, 2015-02, Vol.625, p.380-384 |
| issn | 0921-5093 1873-4936 |
| language | eng |
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| source | ScienceDirect Journals (5 years ago - present) |
| subjects | Dislocation mobility Hardening Hardness Hardness measurement Heating Helium Indentation Microstructure Nanoindentation Tungsten Vacancies |
| title | High temperature indentation of helium-implanted tungsten |
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