Synthesis and Characterization of Particle-reinforced Ni/Al₂O₃Nanocomposites

Nanocomposite Ni/Al₂O₃films were electrodeposited from a suspension of Al₂O₃nanoparticles in aqueous nickel sulfamate solution. The volume fraction of particles incorporated increased with electrode rotation rate and decreased with deposition current density. The composition, microstructure, hardness, and magnetic properties of these nanocomposite films were characterized. The mechanical strengthening due to particle dispersion in the films was interpreted by considering an Orowan dislocation bowing mechanism. The coercivity of the films increased with increasing particle concentration in the film. The saturation magnetization showed a weak dependence on particle concentration.