The diffusivity of H in Fe3Al-based alloy samples (5Cr, 0.1Zr, 0.05B) with various grain shapes and sizes was investigated. This showed that the H diffusion coefficients were all similar at a given temperature (figure 13), and indicated that neither the grain shape nor the size affected H diffusion.

X.Y.Cheng, X.J.Wan: Scripta Materialia, 1998, 38[10], 1505-9

 

Table 38

Diffusivity of 65Zn in Fe2Al

 

Temperature (K)

D (m2/s)

Structure

1370

2.85 x 10-12

A2

1269

4.84 x 10-13

B2

1179

1.13 x 10-13

B2

1079

1.04 x 10-14

B2

976

7.08 x 10-16

B2

873

1.68 x 10-17

B2

 

Figure 11

Diffusivity of 65Zn in Fe67Al33