The first straightforward measurements of the diffusion coefficient of H migrating in icosahedral quasi-crystalline ribbons of Ti45Zr38Ni17 and in 2-phase bulk samples containing both the icosahedral phase and the Laves phase were reported. It was found that, at 273 to 353K, the diffusivity could be described by:

ribbons:     D (cm2/s) = 1.0 x 10-1 exp[-0.24(eV)/kT]

bulk:     D (cm2/s) = 5.0 x 10-5 exp[-0.25(eV)/kT]

The ratio of the volumes of the phases changed during hydrogenization.

V.Azhazha, A.Grib, G.Khadzhay, S.Malikhin, B.Merisov, A.Pugachov: Journal of Physics - Condensed Matter, 2003, 15[29], 5001-8

 

Table 305

Diffusion of Various Solutes in Ti60Ni40

 

Solute

Temperature (K)

D (m2/s)

B

604

5.2 x 10-21

B

690

7.3 x 10-19

Be

604

8.5 x 10-22

Be

690

1.5 x 10-19

Fe

604

8.3 x 10-20

Fe

690

2.0 x 10-21

Si

604

1.4 x 10-23

Si

690

4.0 x 10-21

 

Table 306

Diffusivity of Zr in TiZr as a Function of Pressure

 

Temperature (K)

Pressure (MPa)

D (m2/s)

1493

18

2.05 x 10-12

1493

343

2.68 x 10-12

1493

760

1.82 x 10-12

1493

902

1.69 x 10-12

1493

960

1.86 x 10-12

1003

48

4.12 x 10-14

1003

350

3.13 x 10-14

1003

750

3.20 x 10-14

1003

1090

2.25 x 10-14

1003

1440

2.18 x 10-14