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Guinier-Preston I Zones in AL-1.75 at.% Cu Single Crystals
Published online by Cambridge University Press: 28 February 2011
Abstract
The elastic diffuse neutron scattering from two Al-1.75 at.% Cu single crystals with either the isotope Cu-63 or Cu-65, aged to contain type-I Guinier-Preston zones has been measured along a reciprocal lattice line and evaluated based on an expansion of the atomic displacement scattering up to terms of third order. It is shown that erroneous results for the short-range order term are obtained if the evaluation does not include data from the first Brillouin zone. The most reliable short-range order scattering extracted for both crystals is consistent with essentially single-layered Cu-rich zones.
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