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Experimental Overview of Complex Intermetallic Structures |
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| Authors: | Laridjani M Donnadieu P Dénoyer F |
| Institution: | (1) Laboratoire de Physique des Solides, UMR 8502, Université Paris-Sud, Bâtiment 510, 91405 Orsay Cedex, France;(2) Laboratoire de Thermodynamique et Physico-Chimie Métallurgiques, ENSEEG, INPG, UMR 5614, Domaine Universitaire, BP 75, 38402 Saint-Martin d'Héres Cedex, France |
| Abstract: | A complete investigation of the Fourier space of complex intermetallic Mg39Al61 is reported. X-ray patterns reveal the reciprocal space of the whole system consisting in selective reflections and coherent diffuse scattering. Their temperature dependence are studied. Selective reflections are interpreted as incommensurately modulated states and a structural analysis of the coherent diffuse scattering is presented. The same type of coherent diffuse scattering curve was also observed in several quasicrystalline alloys. In all the studied cases, the disorder is interpreted by the presence of icosahedral arrangements that are reminiscent of Frank units in supercooled alloys. |
| Keywords: | Structure of complex alloys Frank– Kasper phases metastable phases X-ray diffraction X-ray diffuse scattering |
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