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Titel: Early stages of decomposition in Al alloys investigated by X-ray absorption
Autor(en): B. Klobes Person, T. E. M. Staab Person und E. Dudzik
Journal: Phys. Status Solidi: RRL
Jahr: 2008
Band: 2
Ausgabe: 4
Seite(n): 182-184
DOI: 10.1002/pssr.200802067
ISSN: 1862-6254
Datei / URL: http://onlinelibrary.wiley.com/doi/10.1002/pssr.200802067/abstract
Zusammenfassung: We demonstrate the sensitivity of X-ray absorption fine-structure (XAFS) measurements to the earliest stages of decomposition in Al alloys, i.e. just a few minutes after quenching. XAFS is one of the few applicable experimental approaches to this regime. Three different AlCu(Mg) samples were investigated by XAFS at the Cu K edge. Significant changes of the XAFS can be detected in the course of the decomposition in these alloys during the first 15 minutes. Actually, these changes correspond to relaxations of the nearest neighbours towards the absorbing Cu atoms. The Fourier transformation of the XAFS spectra thus leads to a pseudo radial distribution function which reflects this relaxation. In addition, XAFS measurements of the S-phase of AlCuMg are used to decide in favour of the Perlitz and Westgren model for the S-phase. (c) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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