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MM: Fachverband Metall- und Materialphysik
MM 20: Liquid and Amorphous Metals III: Deformation of Metallic Glasses
MM 20.5: Vortrag
Dienstag, 17. März 2015, 11:15–11:30, H 0107
Evolution of crystallite size, lattice parameter and internal strain in Al precipitates during high energy ball milling of partly amorphous Al87Ni8La5 alloy — •Matthias Dittrich1,2 and Gerhard Schumacher1 — 1Helmholtz-Zentrum Berlin, Mikrostruktur und Eigenspannungsanalyse — 2jetzt: Bundesanstalt für Materialforschung und -Prüfung Berlin
The effects of plastic deformation by ball milling on the structure of a partly amorphous Al87Ni8La5 alloy were investigated by X-ray diffractometry. Lattice parameter, crystallite size and lattice strain of the fcc- Al precipitates were determined by Rietveld refinement, double-Voigt approach and Williamson-Hall plots. The changes in lattice parameter of fcc-Al nano-precipitates during ball milling are ascribed to the uptake of Ni. The crystallite size decreases as a function of the milling time from about 100 nm in the as- atomized state to about 14 nm after 1440 min of ball milling time. A model based on shear deformation of precipitates in the amorphous phase is used to describe quantitatively the decrease in crystallite size and change in lattice parameter.