Research of Mechanical Properties of Random Disordered CuNi Alloys

Abstract

Preparation technique and structural analysis of random CuNi disordered alloys have been discussed. The arcmelting method is used to prepare different compositions of substitutional random disordered Cu1-x Nix (0.1, 0.3, 0.5, 0.7, 0.9) alloys. The stoichiometric amounts of highly purity constituents copper and nickel metals 5 N (99.999%) have been melted under argon atmosphere in vacuum chamber of 10−3 torr. The substitutional random disordered alloys free from carbon and oxygen traces are confirmed from XPS data. A lattice strain is produced in CuNi alloys as the environment of Ni atoms change from sites to sites. Lattice parameters, unit cell volume, structure and inter-planar spacing were calculated from XRD analysis. The average crystallite size of different compositions of random disordered CuNi alloys is calibrated by using Scherer’s method and Williamson-Hall (W-H) method. The roles of crystallite size and lattice strain on the XRD peak broadening of the random disordered CuNi alloys were analyzed. The strain increases with increase in concentration of Ni and exhibits a maximum of 0.00247 at 50% Ni concentration. The CuNi alloys find very wide applications in oil refining and long corrosion free life.