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HomeDiffusion FoundationsDiffusion Foundations Vol. 9Diffusion in Quasi-Crystalline Alloys

Diffusion in Quasi-Crystalline Alloys

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Abstract:

In this Chapter, we review knowledge about diffusion in quasi-crystalline alloys (quasicrystals). In Section 1 we first remind the reader of some major aspects of the quasi-crystalline state and in Section 2 we introduce phase diagrams with quasi-crystalline phases, for which detailed diffusion studies are available. We mention in Section 3 the more common experimental methods for diffusion studies. The diffusive motion of atoms in quasi-crystalline alloys can be studied by the same techniques used for crystalline metallic alloys and intermetallics – measurements of radiotracer diffusion and diffusion of stable isotopes and solute atoms by SIMS profiling. The best-studied quasi-crystalline alloys are icosahedral AlPdMn, icosahedral ZnMgRE (RE = rare earth metal), and decagonal AlNiCo. The major diffusion results for these quasicrystals are reviewed in Sections 4, 5, and 6. Section 7 is devoted to the pressure dependence of diffusion in quasicrystals and to a comparison of the activation volumes with those of crystalline metals. Positron annihilation studies are also mentioned, which together with activation volumes for diffusion strongly favour a vacancy mechanism in quasicrystals. The major results and conclusions are summarized in Section 8.

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Periodical:

Diffusion Foundations (Volume 9)

Pages:

42-57

DOI:

https://doi.org/10.4028/www.scientific.net/DF.9.42

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Online since:

October 2016

Authors:

Helmut Mehrer

Keywords:

Activation Enthalpy, Activation Volume, Decagonal Quasicrystals, Icosahedral Quasicrystals, Positron Annihilation, Pre-Exponential Factor, Pressure Dependence, Self-Diffusion, SIMS, Solute Diffusion, Thermal Vacancies, Tracer Method, Vacancy Mechanism, W-Parameter

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© 2016 Trans Tech Publications Ltd. All Rights Reserved

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