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 27) 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 27

Diffusion of Pb in -Ti

 

 

T (K)

 

Annealing Ambient

 

Initial Pb Concentration (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