The migration of C was studied by using a radioactive tracer technique. It was found that C migrated towards the hotter end for all Ti contents; corresponding to a negative heat of transport. The value of the latter decreased monotonically from -42.3kJ/mol for V, to -14.0kJ/mol for V-20.5at%Ti (table 321). The activation energy for C diffusion increased almost linearly from 116.3kJ/mol in V to 188.5kJ/mol in V-20.5at%Ti (table 322). It then decreased to a value of 94.6kJ/mol in β-Ti, according to previous experiments.

W.Uz,, O.N.Carlson: Journal of the Less-Common Metals, 1986, 116[2], 317-32

Table 322

Diffusion Parameters for C in V-Ti Alloys