Diffusion in Metals, Intermetallics, Silicides, Quasicrystals and Metallic Glasses
Diffusion in Quasicrystalline Materials
Quasicrystalline alloys are no longer laboratory curiosities. Some applications are already close to the market.
We have studied within a DFG Schwerpunktprogramm the diffusion behaviour of various quasicrystalline
alloys. A review on diffusion in quasicrystalline alloys was prepared and published together with other
members of the Schwerpunktprogramm as a chapter in a book on quasicrystals.
In 2003/04 we studied in
particular gallium diffusion in decagonal AlNiCo quasicrystals in both principal directions and of gallium
diffusion in icosahedral AlPdMn quasicrystals. Gallium was used to mimic aluminium self-diffusion, which
cannot be measured using conventional tracer techniques. The depth-profiles of the stable isotopes were
analysed by SIMS profiling. We compare our results in decagonal AlNiCo with experimental data on
self-diffusion of cobalt and nickel and with MD-simulations of Al self-diffusion from literature. Our experiments
and the MD simulations show that the diffusion parallel to the decagonal axis is faster than perpendicular to it.
In addition we carried out diffusion studies of the major component zinc in icosahedral ZnMgY, icosahedral
ZnMgHo (fci-phases) and a related hexagonal ZnMgY composition (Z-phase) along both principal directions.
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