The diffusion coefficients were measured (table 189) by using Boltzmann-Matano techniques. It was found that the diffusivities decreased rapidly with increasing Ti content. The coefficients exhibited an Arrhenius temperature dependence in each alloy, at temperatures of between 230 and 473K, and activation energies which increased with increasing Ti content. The coefficient decreased linearly with increasing H content in all of the alloys. The terminal solid solubilities increased markedly with increasing Ti content, and D had a larger terminal solid solubility than H in alloys with less than 10at%Ti. The diffusion results did not agree with the localized deep trapping of H by the Ti atoms.
Hydrogen and Deuterium Diffusion in Vanadium-Titanium Alloys. D.T.Peterson, H.M.Herro: Metallurgical Transactions A, 1987, 18[2], 249-54
Table 189
Parameters for D and H Diffusion in V-Ti
Ti (at%) | Isotope | Do (m2/s) | E (kJ/mol) |
0 | H | 2.7 x 10-8 | 4.1 |
0 | D | 4.0 x 10-8 | 6.9 |
1 | H | 3.7 x 10-8 | 4.7 |
1 | D | 3.8 x 10-8 | 7.2 |
5 | H | 2.8 x 10-7 | 13.9 |
5 | D | 1.1 x 10-7 | 13.1 |
10 | H | 3.4 x 10-7 | 16.2 |
10 | D | 1.2 x 10-7 | 15.2 |
20 | H | 2.5 x 10-7 | 17.7 |
20 | D | 2.8 x 10-7 | 19.7 |
30 | H | 2.6 x 10-7 | 19.3 |
30 | D | 2.1 x 10-7 | 21.3 |