Helium implanted FeCr alloys studied by positron annihilation lifetime technique

• Main Authors: Krsjak, V., Egger, W., Petriska, M., Sojak, S.
• Format: Article
• Language: English
• Published: Національний науковий центр «Харківський фізико-технічний інститут» НАН України 2009
• Series: Вопросы атомной науки и техники
• Online Access: http://dspace.nbuv.gov.ua/handle/123456789/96342

The influence of chromium on the radiation damage resistance of iron based alloys has been studied using conventional positron lifetime technique and a pulsed low energy positron beam. To simulate high neutron flux, the helium implantation has been used. Different levels of helium doses (6.24·10¹⁷–3.12·10¹⁸ cm⁻²) corresponding to a local damage of up to 90 dpa were accumulated in a thin <1 μm region. Four different binary FeCr alloys (2.6; 4.6; 8.4; 11.6 wt.% of Cr) have been used in this study. The obtained results show that chromium has a significant effect on the size and distribution of the created defects. The character of these defects has been determined as large voids (>1 nm) and small vacancy clusters together with the initial dislocations and small point defects.