Abstract
We have performed proton irradiation ofWand W-5wt.%Ta materials at 350 C with a step-wise damage level increase up to 0.7 dpa and using two beam energies, namely 40 keV and 3 MeV, in order to probe the accumulation of radiation-induced lattice damage in these materials. Interstitial-type a/2 dislocation loops are formed under irradiation, and their size increases in W-5Ta up to a loop width of 21 ± 4 nmat 0.3 dpa, where loop saturation takes place. In contrast, the loop length in W increases progressively up to 183 ± 50 nm at 0.7 dpa, whereas the loop width remains relatively constant at 29 ± 7nmat >0.3 dpa, giving rise to dislocation strings. The dislocation loops and tangles are observed in both materials examined after a 3 MeV proton irradiation at 350 C. Ta doping delays the evolution of radiation-induced dislocation structures in W, and can consequently impact the hydrogen isotope retention under plasma exposure.
Details
Original language | English |
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Pages (from-to) | 329-335 |
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Number of pages | 7 |
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Journal | Journal of Nuclear Materials |
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Volume | 501 |
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DOIs | |
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Publication status | Published - 1 Apr 2018 |
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