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 35, figure 8) could be described by:

65Zn in Fe52Al48 (B2):     D (m2/s) = 1.2 x 10-2 exp[-2.60(eV)/kT]

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

 

Table 33

Diffusivity of 59Fe in FeAl (B2 Structure)

 

Temperature (K)

Method

D (m2/s)

1471

dripping

2.75 x 10-12

1372

dripping

4.16 x 10-13

1272

dripping

6.10 x 10-14

1175

dripping

7.63 x 10-15

1076

implantation

9.29 x 10-16

982

implantation

5.00 x 10-17

877

implantation

8.69 x 10-19

775

implantation

9.77 x 10-21

Figure 7

Diffusivity of 114mIn in Fe52Al48