Abstract
Single crystals of 65 Cu-31 at.% Zn, nat Cu-31 at.% Zn, and 65 Cu-22 at.% Zn were investigated by diffuse neutron scattering. The contributions from short-range order and static atomic displacements were separated. Because of the different scattering lengths of 65 Cu and nat Cu species-dependent displacements could be extracted for the alloys with 31 at.% Zn. Effective pair interactions obtained by the inverse Monte-Carlo method show a dominant V 110 of œ520 meV and no distinct concentration dependence. All three sets of effective pair interactions give a low antiphase boundary energy of œ55 mJ/m 2 facilitating the formation of long-period superstructures
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