THE ALTERATION OF MECHANICAL BEHAVIOR FOR Ba0.5Sr0.5Fe12O19/(Ni0.5Zn0.5)Fe2O4 NANOCOMPOSITES

Ba0.5Sr0.5Fe12O19/(Ni0.5Zn0.5)Fe2O4 nanocomposites with x = 10, 20, 30, and 50 wt.% derived from nickel zinc ferrite added to barium strontium hexaferrite were synthesized and characterized in this work. The prepared nanoparticles and nanocomposites were manufactured by co-precipitation and high-speed ball milling approaches. FTIR spectroscopic analysis revealed the absorption peaks that are characterized of both soft spinel and hard hexagonal ferrites in the nanocomposites. Additionally, the mechanical parameters have been computed from the FTIR data. Besides, force constant on A-site and B-site, Debye temperature, longitudinal, transverse and mean elastic wave velocities of the prepared samples, have been calculated. Furthermore, Vickers microhardness (H-v) tests were made to analyse the mechanical properties of the prepared samples under a range of applied loads (0.49-9.8 N) and temperatures (30-80 ?). The Hv measurements revealed that the prepared samples exhibited the behaviour of normal indentation size effect. Diverse models were theoretically used to study the obtained H-v values. The most appropriate theoretical model to depict the actual Hv values is the modified proportional sample resistance model. Besides, with increasing temperature, the BaSr/10%NiZn sample had the highest H-v values among the nanocomposites.