The first measurements were reported of implanted Pb diffusion in -Ti. At high implanted Pb concentrations (about 20at%), an initial non-equilibrium stage was observed within which no diffusion coefficient was obtained. In a second stage, when the Pb concentration had decreased due to diffusion and evaporation, the diffusivities (table 245) were deduced from profiles with a maximum depth of about 100nm.
M.Mirassou, R.Pérez, F.Dyment, J.H.R.Dos Santos, M.Behar: Scripta Materialia, 1996, 34[10], 1537-42
Table 245
Diffusion of Pb in -Ti
Temperature (K) | Ambient | Initial Pb (at%) | D (m2/s) |
823 | sealed | 22 | 2.2 x 10-22 |
873 | sealed | 6.5 | 1.6 x 10-21 |
923 | vacuum | 22 | 9 x 10-21 |
923 | sealed | 22 | 8 x 10-21 |
973 | vacuum | 6.5 | 4 x 10-20 |