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Diffusion in decagonal and icosahedral quasicrystals and a related hexagonal phase

Galler, Robert ; Uhrig, Eckhard ; Assmus, Wolf ; Flege, Stefan ; Mehrer, Helmut (2005):
Diffusion in decagonal and icosahedral quasicrystals and a related hexagonal phase.
In: Defect and diffusion forum, 237-240, pp. 358-363. Trans Tech Publications, ISSN 1662-9507,
DOI: 10.4028/www.scientific.net/DDF.237-240.358,
[Article]

Abstract

We present investigations of gallium diffusion in decagonal AlNiCo quasicrystals in both principal directions and of gallium diffusion in icosahedral AlPdMn quasicrystals. Gallium was used to approximate 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. We report the Arrhenius parameters and compare the diffusion behaviour of the various materials.

Item Type: Article
Erschienen: 2005
Creators: Galler, Robert ; Uhrig, Eckhard ; Assmus, Wolf ; Flege, Stefan ; Mehrer, Helmut
Title: Diffusion in decagonal and icosahedral quasicrystals and a related hexagonal phase
Language: English
Abstract:

We present investigations of gallium diffusion in decagonal AlNiCo quasicrystals in both principal directions and of gallium diffusion in icosahedral AlPdMn quasicrystals. Gallium was used to approximate 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. We report the Arrhenius parameters and compare the diffusion behaviour of the various materials.

Journal or Publication Title: Defect and diffusion forum
Journal volume: 237-240
Publisher: Trans Tech Publications
Uncontrolled Keywords: Self-diffusion, icosahedral quasicrystals, docagonal quasicrystals, related hexagonal phase, majority component, activation enthalpy, phason-assisted diffusion, vacancy mechanism
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Material Analytics
Date Deposited: 20 Nov 2008 08:23
DOI: 10.4028/www.scientific.net/DDF.237-240.358
Funders: Financial support of DFG within Schwerpunktprogramm "Quasikristalle" is gratefully acknowledged.
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