Influence of alloying elements in Ni and Fe on ion-implanted helium behavior

Behavior of ion-implanted helium and bubble microstructure evolution in Ni-base (Ni-C, Ni-Al) and Fe-base (Fe-C) model alloys, as well as in homogeneous austenitic 16-15 type steel with various carbon contents and in age hardening 15-35 type steel as a function of alloying element concentration, have been investigated by means of thermal desorption spectrometry (TDS) and transmission electron microscopy (TEM). The results show the different nature of influence of carbon and aluminium on bubble parameters formed during postirradiation annealings. Calculated by means of the 'tempering' method, helium release effective activation energy proved to be higher for alloys than for pure metals. The effect of these observations is discussed from the standpoint of diffusion parameter change in metals by alloying. (orig.)