High-temperature damage evolution in 10 keV He+ irradiated W and W-5Re
- School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 (China)
- Department of Materials Science, Faculty of Science and Engineering, Shimane University, 1060 Nishikawatsu, Matsue 690-8504 (Japan)
- Department of Materials, University of Oxford, Parks Road, OX1 3PH Oxford (United Kingdom)
Highlights: • High-temperature damage in pure W appeared strongly dependent upon foil thickness. • Visible bubbles occurred at above a threshold fluence of ~ 4.5×10{sup 19} He{sup +}/m{sup 2}. • Dislocations with b = ½ were identified and exhibited a wavy morphology. • The bypass of bubbles by dislocations operated through simple shear. • Rhenium gave rise to ~ 10-40% increase in bubble size and a pronounced change in bubble morphology. - Abstract: High-temperature damage evolution in pure W and W-5Re has been studied by combining transmission electron microscopy and in-situ irradiations with 10 keV He{sup +} ions. The irradiations covered a temperature range of T{sub irr} = 773–1473 K and a fluence range of (4.5–15) × 10{sup 19} He{sup +}/m{sup 2}. In pure W, detailed characterizations have shown that damage evolution is highly dependent upon the foil thickness. Regions of thickness irr from 773 K to 1473 K, a pronounced bubble growth and an increased degree of bubble ordering were observed. In thicker regions (≳100 nm), 1/2<111> dislocation loops and line entanglements were found up to 1473 K, and were often seen to be decorated with helium bubbles. In W-5Re, areas of different foil thickness exhibited only small differences in damage evolution. The densities of bubbles were comparable to those seen in pure W at all temperatures, while the average size of bubbles was found to be ~10–40% higher. The damage microstructure transformed from a mixture of dislocation loops and bubbles at 773 K to dislocation line entanglements decorated with bubbles at 1473 K.
- OSTI ID:
- 22805835
- Journal Information:
- Materials Characterization, Journal Name: Materials Characterization Vol. 145; ISSN 1044-5803; ISSN MACHEX
- Country of Publication:
- United States
- Language:
- English
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