Void evolution in tungsten and tungsten-5wt.% tantalum under in-situ proton irradiation at 800 and 1000 °C
作者： Iuliia Ipatova , RW Harrison , SE Donnelly , MJD Rushton , SC Middleburgh
DOI: 10.1016/J.JNUCMAT.2019.07.030
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摘要: Abstract We have probed void evolution in polycrystalline W and W-5wt.%Ta material at 800 1000 °C, by transmission electron microscopy during in-situ irradiation with a 40 keV proton beam. The presence of radiation-induced dislocation loops was not observed prior to formation those elevated temperatures. damaged microstructure characterised the population randomly distributed voids, whose number density reduces when temperature increases. Soft impingement voids becomes noticeable damage levels ≥0.2 dpa. In contrast, excess free vacancies irradiated 800 °C only leads visible this TEM study (≥2 nm) after post-irradiation annealing sample 1000 °C. Solute Ta atoms also cause significant increase comparing both materials gradual progression towards saturation average size Moreover, we detected progressive transition from spherical faceted shape present ≥0.3
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