Abstract
In order to study the microstructural evolution of the He+ irradiated FeCrNi model alloy, 140keV He+ ions were implanted into the specimen with the fluence of 1×1015ions/cm2 at room temperature. Positron annihilation spectroscopy was used to characterize the evolution of micro defects during isochronal annealing between 423 and 873K. The decrease of the S parameter between 573 and 623K has been associated to the annihilation of vacancy clusters, which were not trapped by helium atom. While the decline of the S parameter between 773 and 823K in the damage region might be caused by the dissociation of HenVm clusters. The dissociated vacancy clusters were unstable and annihilated rapidly, which decreases the concentration of vacancy defects.
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