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Surface Alloys of Icosahedral AlMnSi with Phason Distortions

Published online by Cambridge University Press:  28 February 2011

D. M. Follstaedt  and
J. A. Knapp
D. M. Follstaedt
Affiliation:
Sandia National Laboratories, Division 1112, Albuquerque, NM 87185-5800
J. A. Knapp
Affiliation:
Sandia National Laboratories, Division 1112, Albuquerque, NM 87185-5800
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Abstract

The microstructures produced by electron-beam melting and by ion-beam mixing Al/Mn and Al/Mn/Si layers on Si substrates are examined. The treatments were found to incorporate Si from the substrate into the surface alloy. Several phases formed, depending on treatment, including α- and β-AlMnSi, μ-AlMn (epitaxial on Si{111}), and amorphous and icosahedral AlMnSi. The observed microstructures relate the novel icosahedral phase to other phases and elucidate its formation kinetics. Diffraction patterns from large icosahedral grains (up to 5 μm) show distortions in the position and shape of weak (but not strong) reflections, as predicted for phason defects in a quasicrystalline lattice, one of the structures proposed for icosahedral phases.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 74: Symposium A – Beam-Solid Interactions and Transient Processes , 1986 , 333
Copyright
Copyright © Materials Research Society 1987

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