Production of inorganic phase added aluminum-based hybrid composites and investigation of their mechanical properties

Thesis; It involves the production of aluminum-based hybrid composites with added inorganic phase by powder metallurgy method and the investigation of their mechanical properties. Slag and Ti3SiC2 MAX powders were used as additive elements, and Al7075 alloy was used as matrix. Powder mixtures were obtained by adding 0, 2.5, 5, 7.5 and 10% additives by weight (10% in total) to the aluminum matrix structure. Homogeneous powder mixtures produced with the help of a Turbola mixer were hot pressed for 30 minutes under 200 MPa pressure and 600 oC temperature conditions, and both shaping and sintering were performed. Physical, microstructure and mechanical properties (hardness, strength, wear) of sintered bulk composites were investigated. According to the results obtained; The highest amount of porosity (2.00%) was obtained for composites with 10% Ti3SiC2 additive ratio. As the amount of slag increased from 0% to 10%, a decrease in hardness (118HB) and cross-breaking strength (529 Mpa) values ​​was observed, while an increase in friction coefficient (0.4669μ) and weight losses (1.691mm3) was observed. The highest hardness value was measured as 121 HB and cross fracture strength was measured as 584 Mpa. By increasing the Ti3SiC2 additive ratio, the best wear rate (0.1135 mm3/Nmx10-3) and lowest friction coefficient (0.455μ) results were obtained in hybrid composites. It was observed that as the wear test duration increased, the abrasive wear mechanism turned into adhesive. In the tensile test microstructure analysis, the slag additive showed brittle fracture behavior, while spherical grain Ti3SiC2 exhibited elastic behavior like ceramics and achieved ductile fracture.