Abstract
A kinetic model of hydrogen capture and accumulation in tungsten under low-energy bombardment with hydrogen atoms in the “subthreshold” mode is proposed in this paper. Primary defects do not form in the bombarded material in this mode. This model takes into account the physical mechanisms for hydrogen bubble nucleation and growth at dislocations, i.e., the presence of “traps” in the dislocation core and dislocation jog formation due to interstitial tungsten-atom emission during the bubble growth process. Features of the dynamics of bubble growth as a function of the temperature and the hydrogen flux are studied. It is shown that there is a “threshold” temperature that is dependent on the flux of implanted particles and above which the process of hydrogen-bubble formation is suppressed significantly. The obtained estimates of the “threshold” temperature (600–700 K for a flux in the range of 1022–1023 m–2 s–1) agree with existing published experimental data.
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