The impurity diffusion of Zn was investigated by using the radiotracer technique and the isotope, 65Zn. The Zn was chosen with the aim of simulating Al diffusion; for which no feasible radio-isotope was available. It was found that the diffusivity of Zn was slightly higher than that of Fe. The data (table 38, figure 11) could be described by:

65Zn in Fe67Al33 (A2/B2):     D (m2/s) = 4.3 x 10-3 exp[-2.49(eV)/kT]

M.Eggersmann, H.Mehrer: Philosophical Magazine A, 2000, 80[5], 1219-44

 

Table 36

Diffusivity of 59Fe in Fe2Al

 

Temperature (K)

Method

D (m2/s)

Structure

1470

dripping

4.13 x 10-12

A2

1378

dripping

8.36 x 10-13

A2

1278

dripping

1.23 x 10-13

B2

1176

dripping

1.89 x 10-14

B2

1082

dripping

2.03 x 10-15

B2

977

implantation

1.20 x 10-16

B2

875

implantation

5.70 x 10-18

B2

776

implantation

6.64 x 10-20

B2