Evolution, migration and clustering of helium-vacancy complexes in RAFM steel- depth resolved positron annihilation Doppler broadening study. Issue 22 (2nd August 2016)

• Record Type: Journal Article
• Authors: Ramachandran, R.; David, C.; Rajaraman, R.; Panigrahi, B. K.; Amarendra, G.
• Is Part Of: Philosophical magazine. Volume 96:Issue 22(2016)
• Page Start: 2385
• Page End: 2396
• Publication Date: 2016-08-02
• Subjects: Positron annihilation -- helium implantation -- RAFM steel -- irradiation damage; Condensed matter -- Periodicals; Physics -- Periodicals; Matière condensée -- Périodiques; Physique -- Périodiques; 530.41
• DOI: 10.1080/14786435.2016.1200758
• Languages: English
• ISSNs: 1478-6435

Abstract

Abstract: Indian Reduced Activation Ferritic Martensitic steel is implanted with 130 keV helium ions to a fluence of 5 × 10 14 and 1 × 10 16 ions/cm 2 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.