Abstract
The H chemical diffusion coefficient D c has been determined in the Ni 47Ti 40Hf 10Cu 3 alloy from the kinetics of the gas/solid-surface reaction in the temperature range 350–1000 K. The mobility of H was also investigated by mechanical spectroscopy at temperatures included between 240 and 260 K, where a Snoek internal friction peak occurs for frequencies in the kHz range. The results on the Einstein diffusion coefficient D E obtained from the relaxation time of the Snoek effect were correlated to the high temperature absorption results. Combined Arrhenius plots of D E and D c data allow to determine the H diffusion parameters to: W = 0.47 ± 0.01 eV, D 0 = 2 × 1 0 − 3.0 ± 0.2 cm 2/s.
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