Abstract
Thermal desorption spectrometry is used to study the characteristic behavior of helium in the new model bcc and fcc alloys Fe-13Cr and Fe-16Cr-15Ni, which are the basis of structural reactor steels, with the substitution elements Mo, W, Nb, Ta, V, and Ti and carbon. It is found that the gas-release spectra of bcc alloys are more complicated. The activation energy of gas release is calculated. It is shown that the alloying elements do not have a unique effect on the mechanisms of helium release from bcc and fcc alloys. The data obtained are discussed from the standpoint of the formation and thermal stability of different helium—vacancy complexes and the effect of doping by a change of the diffusion mechanisms on the growth and migration of bubbles.
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