Behavior of ion-implanted helium and bubble microstructure evolution i
n Ni-base (NGC, NI-AI) and Fe-base (Fe-C) model alloys, as well as in
homogeneous austenitic 16-15 type steel with various carbon contents a
nd 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 res
ults show the different nature of influence of carbon and aluminium on
bubble parameters formed during postirradiation annealings. Calculate
d by means of the 'tempering' method, helium release effective activat
ion energy proved to be higher for alloys than for pure metals. The ef
fect of these observations is discussed from the standpoint of diffusi
on parameter change in metals by alloying.