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  Dittrich, M.; Schumacher, G.: Evolution of crystallite size, lattice parameter and internal strain in Al precipitates during high energy ball milling of partly amorphous Al₈₇Ni₈La₅ alloy. Materials Science and Engineering A 604 (2014), p. 27-33

10.1016/j.msea.2014.03.004
Open Access Version

Abstract:
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 plot. 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 in lattice parameter.