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- Title
Quasicrystal–crystal structural transformation in Al–5 wt.% Mn alloy.
- Authors
Saksl, Karel; Vojtěch, Dalibor; Franz, Hermann
- Abstract
The atomic structure of Al–5 wt.%Mn (Al–5Mn) alloy, prepared by rapid solidification, and pre-annealed at 623 and 773 K for 5 and 1 h, respectively, were characterized by X-ray powder diffraction (XRD) and extended X-ray absorption fine structure (XAFS) techniques. The sample in as-quenched stage was found crystalline, consisting of metastable α-Al (Al–Mn solid solution) and icosahedral quasicrystalline I-Al6Mn phases. Five hours annealing at 623 K proved thermal stability of both the phases. Pre-annealing at 773 K/1 h on the other hand leads to α-Al phase decomposition and structural transformation of metastable I-Al6Mn to stable orthorhombic Al6Mn phase. The EXAFS results indicate that Mn atoms are located preferably on the outer shell of icosahedrons. During the I-Al6Mn→ o-Al6Mn transformation the total Al atoms coordinating one Mn were found to be constant (∼10). Based on the results, only distance/symmetry changes in atomic arrangement around Mn atoms were suggested.
- Subjects
ATOMIC structure; MANGANESE; X-ray diffraction; EXTENDED X-ray absorption fine structure; SOLID solutions; ATOMS
- Publication
Journal of Materials Science, 2007, Vol 42, Issue 17, p7198
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-006-1425-5