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In tungsten plasma-facing fusion reactor components, Ta is the third most abundant element formed by transmutation (after Re and Os), yet little is known about the behaviour of W-Ta alloys under irradiation and any effects Ta might have on Re clustering in W-Re-Ta alloys. In this study, W−4.5 at.%Ta, W−2 at.%Re−1 at.%Ta and W−2 at.%Re alloys were exposed to 2 MeV W+ ions to a fluence of 2.64 × 1015...
This study examines clustering and hardening in W–2at.% Re and W–1at.% Re–1at.% Os alloys induced by 2MeVW+ ion irradiation at 573 and 773K. Such clusters are known precursors to the formation of embrittling precipitates, a potentially life-limiting phenomenon in the operation of fusion reactor components. Increases in hardness were studied using nanoindentation. The presence of osmium significantly...
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