چكيده به لاتين
One of the important topics in mechanical engineering and materials is improving the surface properties of metals by using different methods of creating surface composites. For this purpose, several methods of modifying surface properties such as electrophoretic deposition, plasma spray, ion implantation, laser melting, thermal oxidation, micro-arc oxidation are used. friction stir process is a surface composite manufacturing method that is researched in various industrial and research institutes due to its simplicity, low energy consumption, environmental friendliness, controllability, improvement of structural and mechanical properties. In this thesis, the conversion of magnesium alloy metal surface into surface composite with the help of titanium oxide reinforcing particles was done with friction stir processing. Magnesium has relatively weak mechanical properties, which is not used much in the industry as the main part of mechanical parts, but this metal has very good biocompatibility, biodegradability and corrosion properties and is used as the main part of important parts in most medical industries. Also, compare it the properties of raw blocks of magnesium with the properties of composites, microstructural observations using optical microscopes and scanning electron microscopes were used, and the results showed a significant reduction in grain size and proper dispersion of reinforcing particles in the composite sample. The hardness of the samples was compared using micro Vickers hardness tester and increased from 53 HV to about 107 HV. Also, by seeing the corrosion surface and corrosion products, it can be concluded that the corrosion mechanism changed from pit to intergranular And the yearly corrosion rate decreased to 5.173 mm/year. The wear properties of the produced samples were tested by performing a wear test (pin on disc) and the wear mechanism was changed from sticking to scratching. To investigate the effect of surface quality on cultured cell adhesion, a cell adhesion test was performed, which indicates that the surface with an average surface roughness of 93 microns has more sticking than the surface with an average roughness of 5 microns, and after 24 hours, 80% of the cells The cultivated ones remained.
