Disorder in Al-Li-Cu and Al-Mn-Si Icosahedral Alloys
- 30 October 1987
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 238 (4827) , 660-663
- https://doi.org/10.1126/science.238.4827.660
Abstract
Faceted dendrites of icosahedral AL6Li3Cu have been studied by high-resolution x-ray scattering. The samples display long-range icosahedral symmetry both in their diffraction patterns and in their macroscopic morphology. Despite the appearance of well-defined facets, the samples have a high degree of atomic disorder. The Bragg peaks have symmetry-dependent shapes and widths that scale linearly with G⊥ (phason momentum). The peak widths are surprisingly similar to those found in icosahedral Al-Mn-Si alloys in both their absolute magnitude and their dependence on G⊥. The origin of these features in models for the icosahedral phase is discussed.Keywords
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