Evolution,migration and clustering of helium-vacancy complexes in RAFM steel- depth resolved positron annihilation Doppler broadening study |
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Authors: | R Ramachandran C David R Rajaraman B K Panigrahi G Amarendra |
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Institution: | Materials Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, India |
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Abstract: | Indian Reduced Activation Ferritic Martensitic steel is implanted with 130 keV helium ions to a fluence of 5 × 1014 and 1 × 1016 ions/cm2 and investigated using positron annihilation spectroscopy. The samples were characterised by defect sensitive S and W-parameters using depth resolved slow positron beam. A dose dependency is observed in the nucleation and growth of helium bubbles with annealing temperature. An experimental evidence for the migration of smaller helium-vacancy complexes is observed via the variation in thickness/width of irradiated layer with temperature. The S–W plot clearly shows the regions corresponding to defect annealing, bubble nucleation and growth. |
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Keywords: | Positron annihilation helium implantation RAFM steel irradiation damage |
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