Investigations on ordering and atom clustering in Al-Li alloy by computer simulation

Investigations on the ordering and atom clustering in aged binary Al-Li alloy have been carried out by computer simulation. The long range order parameter (lro.) and composition deviation order parameter were calculated from single-site occupation probabilities of Li atom. The results show that as the composition of the alloy increases from metastable region to instable region in the phase diagram ordering occurs faster than atom clustering gradually and the incubation period of the phase transformation is shortened.