Abstract
In the current work, ITER grade W irradiated at 1200 oC to a dose of 0.18 dpa has been investigated by Transmission Electron Microscopy (TEM), Positron Annihilation Spectroscopy (PAS), X-ray diffraction, impulse excitation and depth-sensing micro-indentation. The results are compared with those of annealed unirradiated W at 1200 oC. In the as fabricated material dislocations and small vacancy clusters of 1 to 3 vacancies are present. After annealing at 1200 oC, the small vacancy clusters disappear and only the dislocations with almost un-changed density remain. Also, hardness is reduced by 4% and creep increases by 13%. Neutron irradiation at 1200 ◦C results in the increase of the dislocation line density by 3.7 times and in the formation of dislocation loops and voids. The irradiation also causes a hardness increase of about 20% and a creep decrease of 15%. Both the elastic and shear moduli decrease by 4% after irradiation at 1200 ◦C contrary to the effect of only annealing at this temperature which causes an increase in their values by 4%. Texture changes are observed only after neutron irradiation.
Details
Original language | English |
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Article number | 112608 |
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Pages (from-to) | 1-11 |
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Number of pages | 11 |
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Journal | Fusion Engineering & Design |
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Volume | 168 |
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DOIs | |
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Publication status | Published - 1 Jul 2021 |
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