ORDERING BEHAVIOR OF FCC AND HCP ALLOYS IN Ni-Hf AND Re-Ti SYSTEMS

Abstract

The concentration dependence of atomic short range order (SRO) has been studied in Ni 100-x Hf x and Re 100-x Ti x alloys (where x = 2, 5, 10, 15, 20 at.%) using the framework of transition metal model pseudopotential (TMMP). The ordering energies and Warren–Cowley SRO parameters were calculated for the Ni-Hf and Re-Ti alloys. It was found that this model predicted the correct sign of SRO for Ni 100-x Hf x system but failed in the case of Re 100-x Ti x alloys.