Abstract
The development of defect structures has been studied in Fe-10% Cr, “triple-beam” (He +, D + 2 and 4 MeV Fe ++) ion irradiated to 10 dpa at temperatures from 725 to 950 K. Limited cavity formation was observed. Peak swelling of ∼0.02% occurred at irradiation temperatures of ∼850 K. Similar irradiations at this temperature led to ∼0.22% swelling in iron, while no cavities were observed in Fe-5% Cr. Calculations have shown that cavities formed at 875 K and above are more bubble-like than those at lower temperatures. Dislocation structures varied from interstitial dislocation loops with b = a〈100〉 at low temperatures to a coarse dislocation network at 850 K. Large dislocation loops had a convoluted shape which suggested that loop growth had occurred preferentially in 〈110〉 directions. The results are discussed and related to current swelling suppression mechanisms for ferritic steels.
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