The diffusivities in this icosahedral quasicrystal exhibited an Arrhenius-like temperature dependence. The diffusion of Co and Ni was studied in both principal directions of the decagonal samples, and a small observed diffusional anisotropy was considered to be a strong argument in favour of vacancy-mediated diffusion. The significant contributions made by phason flips to diffusion were expected to result in faster diffusion within the layers perpendicular to the decagonal axis, but this was not observed.


Vacancy-Mediated Diffusion in Quasicrystalline Alloys. H.Mehrer, R.Galler: Journal of Alloys and Compounds, 2002, 342[1-2], 296-301

 

 

 Table 1

                                                                                            Diffusivity of 60Co in Al72.2Ni11.8Co16.0 (Tenfold Direction

 

 

Temperature (K)

Diffusivity (m2/s)

803

1.64 x 10-19

870

3.55 x 10-18

923

2.73 x 10-17

971

1.82 x 10-16

993

3.61 x 10-16

1021

1.05 x 10-15

1079

5.50 x 10-15

1144

3.20 x 10-14

1210

1.55 x 10-13