Measurements of Co diffusion in the α-phase were performed by using radio-tracer and direct sectioning techniques (table 237). The Arrhenius plot which was obtained was straight for temperatures ranging from 619 to 823K, and could be described by:

D (m2/s) = 3 x 10-6 exp[-127(kJ/mol)/RT]

The results agreed closely with previous data for temperatures ranging from 871 to 1135K, thus suggesting that there was no ultra-fast impurity effect for diffusion in the α-phase matrix.

R.A.Pérez, F.Dyment: Philosophical Magazine A, 1995, 71[5], 965-73

 

Table 237

Diffusion of 60Co in α-Ti

 

Temperature (K)

D (m2/s)

823

3.2 x 10-14

775

9.8 x 10-15

719

1.7 x 10-15

667

4.1 x 10-16

619

6.8 x 10-17

 

Table 238

Impurity Diffusion Coefficients for Ga in -Ti

 

Temperature (K)

D (m2/s)

1823

1.45 x 10-11

1773

9.75 x 10-12

1723

6.92 x 10-12

1673

4.82 x 10-12

1623

3.30 x 10-12

1573

2.20 x 10-12

1523

1.35 x 10-12

1473

8.30 x 10-13

1423

5.45 x 10-13

1373

3.53 x 10-13

1323

2.02 x 10-13

1273

1.21 x 10-13

1223

7.44 x 10-14