Hydrothermal preparation of cobalt, nickel, copper ferrite nanoparticles and study of microhardness of aluminum-based nanocomposites

In this paper, first different ferrite nanoparticles including, CoFe2O4, NiFe2O4, and CuFe2O4 were synthesized using the hydrothermal method, then for investigation of the properties, various analyzes including SEM, XRD, and VSM were taken from them. Then using the friction stir processing technique, these nanoparticles were poured into AA7075 aluminum alloy and a surface composite was created. Results showed that all particles are in nanoscale and have a uniform and fine-grained structure. Also, the micro-hardness of the produced nanocomposites was significantly increased.Then surface nanocomposites were fabricated with these nanoparticles using FSP and their microhardness properties were investigated. Based on the results of this paper, hydrothermal was a suitable method for the production of nanoparticles with a uniform and fine-grained structure, and the fabricated nanoparticles comply with standard peaks. These nanoparticles also have magnetic properties that can be used for radar wave absorption applications. In addition, the fabricated nanoparticles can also improve the mechanical property of the hardness of the surface nanocomposites.