Abstract
Positron beam-based Doppler broadening results on He ion-implanted FeCrCoNi show distinct changes in defect-sensitive S-parameter corresponding to the formation of helium-vacancy complexes, nucleation/ growth of helium bubbles, and finally the helium bubble rupture, with isochronal annealing. Data analyses of the positron beam-based ratio curves provide clear information on the kinetics of bubble growth and rupture. The difference data in S-parameter (AS), which corresponds to the bubble growth, displays a maximum at 1123 K, with annealing temperature. Comparing the AS value to that reported for nickel, it is concluded that FeCrCoNi has higher bubble growth resistance than nickel.
NSTL
Elsevier