Abstract
The paper summarizes the results of combined SIMS-TDS measurements of hydrogen interaction with the alloys Zr2Fe, Zr(V0.75Fe0.25)2, Zr65V30Ti5, Zr37.7Ti4.7Mn20.2Fe37.4 at hydrogen pressures below 1 × 10−2 Pa, and in temperature range ∼300 ÷ 1100 K. Hydrogen is readily chemisorbed on the sputter-cleaned surface of the alloys. Besides chemisorption, substantial hydrogen uptake into the bulk was observed for Zr2Fe, Zr(V0.75Fe0.25)2, Zr65V30Ti5, but almost no uptake for Zr37.7Ti4.7Mn20.2Fe37.4. Temperature increase above 300 K resulted in the increase of the hydrogen absorption effectiveness and its dissolution rate from the surface into the bulk indicating the surface-to-bulk transition and/or bulk diffusion rate as the absorption limiting steps. Hydrogen release from the alloys was observed at temperatures above 600 K. Its beginning temperature depended on the amount of hydrogen absorbed and the alloy composition. The comparative effectiveness of hydrogen absorption by the alloys decreased in the sequence Zr65V30Ti5 > Zr(V0.75Fe0.25)2 > Zr2Fe.
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