STRUCTURE FUNCTIONS IN DECOMPOSING CURH SYSTEMS

The time evolution of a CuRh alloy quenched within the miscibility gap is investigated by small and wide angle neutron scattering techniques . Near fundamental Bragg reflections diffuse satellites arising from a lattice parameter modulation induced by the precipitation pattern are investigated. The results show that in CuRh the precipitation morphol ogy and its time evolution are quite different from decomposition char acteristics recently observed in the system AuPt, The results are disc ussed and related to the larger lattice misfit present in CuRh in comp arison to AuPt.