Chemical diffusion in this system was studied, at temperatures ranging from 1200 to 1500K, by using pure metal diffusion couples. The concentration penetration profiles were determined by means of electron probe microanalysis, and the diffusion coefficients (tables 301 and 302) were evaluated by using the Boltzmann-Matano method. It was found that the chemical diffusivity at a given composition and temperature could be described by:

D(m2/s) = 2.75 x 10-5exp[-4.14CTi] exp[-{212.647 + 68.16CTi}(kJ/mol)/RT]

The data were explained in terms of the Vignes-Birchenall relationship.

G.B.Kale, R.V.Patil: Materials Transactions, 1994, 35[7], 439-44

Table 299

Arrhenius Parameters for Fe Diffusion

in -Ti and Ti-Fe Alloys at 1176 to 1344