It was found that the tracer diffusivities of Cu and Ni were much greater than those of Zr and Au. This suggested that the values of the atomic radii markedly affected diffusion in the alloy. It was estimated that the activation enthalpy for Ni diffusion was about 105kJ/mol.

H.Hahn, R.S.Averback, S.J.Rothman: Physical Review B, 1986, 33[12], 8825-8

Figure 37

Diffusion of H in Ni47Ti40Hf10Cu3

(Open symbols: absorption method, closed symbols: internal friction method)

 

 

Table 212

Grain Boundary Diffusivities in Ni-4at%Sn,

Deduced from Lamellar Precipitate Growth at 775K

 

Width (nm)

V (m/s)

Sn (at%)

sδD (m3/s)

170

4.3 x 10-9

0.95

4.5 x 10-23

200

7.2 x 10-9

1.02

1.2 x 10-22

250

1.1 x 10-9

1.10

1.8 x 10-23

270

1.3 x 10-9

0.91

2.1 x 10-23

280

9.3 x 10-10

0.98

1.7 x 10-23

300

3.2 x 10-9

1.01

6.2 x 10-23

320

2.8 x 10-9

0.90

6.6 x 10-23

320

5.1 x 10-10

1.06

1.1 x 10-23

350

4.3 x 10-9

1.07

9.1 x 10-24

400

2.3 x 10-10

0.97

5.8 x 10-23