Measurements of Hf diffusion in -Ti were made by using heavy ion Rutherford back-scattering spectrometry at temperatures ranging from 900 to 1145K. It was found that the Arrhenius plot was straight over this range, and that the results (table 243) could be described by:
D (m2/s) = 4 x 10-6exp[-254(kJ/mol)/RT]
These results were also in excellent agreement with published Rutherford back-scattering spectrometry data for temperatures of between 823 and 1023K. It was concluded that Fe had no effect upon Hf diffusion in -Ti.
R.A.Pérez, F.Dyment, G.G.Bermúdez, H.Somacal, D.Abriola: Journal of Nuclear Materials, 1993, 207, 221-7
Table 243
Diffusivity of Hf in -Ti
Temperature (K) | D (m2/s) |
1145 | 1.1 x 10-17 |
1079 | 1.8 x 10-18 |
1023 | 3.5 x 10-19 |
983 | 1.2 x 10-19 |
943 | 3.8 x 10-20 |
902 | 6.5 x 10-21 |