Abstract
Two Al-1.75 at.% Cu single crystals aged together for 60 min at 353 K were investigated by elastic diffuse neutron scattering. A large range of the scattering vector from 0.175 to 6.9 reciprocal lattice units along 〈 h00〉 and the choice of isotopically pure 63Cu and 65Cu for contrast variation allowed the variation of the extracted results for short-range order scattering due to the finite series expansion of the static atomic displacement scattering to be followed systematically. Short-range order scattering was best separated if the scattering within the first Brillouin zone was included in the evaluation. Only then the short-range order scattering is found to be nearly independent of the scattering vector which indicates a considerably lower amount of multilayer Guinier-Preston I zones than found by other authors from three-dimensional diffuse X-ray scattering measurements.
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