In-situ TEM investigation of nano-scale helium bubble evolution in tantalum-doped tungsten at 800°C
نویسندگان
چکیده
The aim of this work is to probe the helium-induced defect production and accumulation in 40 keV He+ irradiated polycrystalline W its alternative alloy W-5wt.%Ta using transmission electron microscopy (TEM) combined with in-situ helium irradiation at 800°?. A maximum damage level 1 dpa a He-to-dpa ratio 5.5 at%/dpa has been reached for both materials, which corresponds an ion fluence 7.33 × 1016 He+/cm2. presence radiation-induced dislocation loops was not observed temperature. low density incipient bubbles already detected 0.004 dpa, 3.3 1014He+/cm2. experiments conducted 800°C have shown that addition 5wt.% tantalum into tungsten may diminish binding He ions vacancies complexes, serve as core bubble, thus hindering bubble formation below 0.02 their further growth population higher levels. By exceeding dose ?0.3 progressive transition from spherical faceted shape but W-5Ta alloy. At >80% were type facet planes {110}.
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ژورنال
عنوان ژورنال: Journal of Nuclear Materials
سال: 2021
ISSN: ['1873-4820', '0022-3115']
DOI: https://doi.org/10.1016/j.jnucmat.2021.152910