ATOMIC ORDERING AND LATTICE SITE LOCATION IN CUBIC Al_3Ti-BASED ALLOYS

摘要

Neutron powder diffraction measurements have been carried out on cubic Al_3TiX compounds (X = Cu, Cr, Mn, Fe and Ni) as a function of temperature from room temperature to 1200℃. The data were analysed by the Rietveld method in order to determine the ordering and lattice site location of the constituent atoms. All these intermetallic compounds were found to be highly ordered at room temperature, and a significant increase in disorder at higher temperatures was observed only in alloys containing Cr and Cu.