The self-diffusion of Ni in bulk metallic glass samples was measured, at 538 to 720K, by using an ion-beam sputter-sectioning technique. It was found that the temperature dependence of the diffusivity in the supercooled liquid phase was very different to that in the amorphous phase below the glass transition temperature. The diffusivity in the supercooled liquid phase was much higher than that extrapolated from the amorphous-

phase data (figure 55). This enhancement was attributed to an increase in the temperature-dependent configuration entropy in the supercooled liquid phase.

H.Nakajima, K.Nonaka, T.Kojima, T.Zhang, A.Inoue: Materials Science Forum, 1999, 304-306, 367-72

 

Figure 56

Diffusivity of H in Mischmetal and Zr Alloys

(a: MmNi3.5Al0.5Fe0.5Co0.5, b: ZrMnFe0.5Ni0.5, c: ZrMnFe0.5Co0.5)

 

Table 355

Diffusivity of Fe in Zr41Be27.8Ti8.7Cu12.5Ni10

Temperature (K)

Diffusivity (m2/s)

513

2.10 x 10-24

551

1.80 x 10-23

555

2.33 x 10-23

573

2.46 x 10-22

585

1.18 x 10-21

612

5.04 x 10-21

628

2.70 x 10-20

642

6.28 x 10-20

651

2.37 x 10-19

657

3.22 x 10-19

Table 356

Diffusivity of B in Zr41Be20Ti16.5Cu12.5Ni10

 

Temperature (K)

Diffusivity (m2/s)

513

4.45 x 10-23

533

2.02 x 10-22

551

9.86 x 10-22

555

1.49 x 10-21

573

3.66 x 10-21

585

9.01 x 10-21

612

3.79 x 10-20

628

1.19 x 10-19

642

4.45 x 10-19

653

7.11 x 10-19

657

1.64 x 10-18