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29 March 2024
 
  » pubmed » pmid17816544

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Disorder in Al-Li-Cu and Al-Mn-Si Icosahedral Alloys
P A Heiney ; P A Bancel ; P M Horn ; J L Jordan ; S Laplaca ; J Angilello ; F W Gayle ;
Date 30 Oct 1987
Journal Science, 238 (4827), 660-663
AbstractFaceted dendrites of icosahedral AL(6)Li(3)Cu 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 perpendicular (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 perpendicular. The origin of these features in models for the icosahedral phase is discussed.
Source PubMed, pmid17816544 doi: 10.1126/science.238.4827.660
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