Mechanical and microstructure properties of aluminium matrix hybrid composite materials

Al matrix composites have been increasingly used in recent years for many years in the areas of automobile, aviation, marine, high-speed trains, where many traditional metals have been replaced. When the excellent properties of hybrid composites are taken into account, the effect of Al matrix composites is further increased. Hybrid composites with superior properties are produced by adding different particles together. Here, the amount and distribution of particles is the most important factor controlling the mechanical properties of the hybrid composite. In this thesis, AlCu matrix was produced by using hot pressing method by adding boron carbide (B4C), hexagonal boron nitride (hBN) and graphite (Gr) at different ratios. The samples with compositions of AlCu, AlCu-10hBN, AlCu-8hBN-2Gr, AlCu-5hBN-5B4C, AlCu-10B4C, AlCu-8B4C-2Gr and AlCu-4hBN-4B4C-2Gr as composites were sintered at 550 ° C for 5 minutes and 35 MPa pressing pressure. Microstructure and mechanical properties of specimens were investigated. Optical microscope, scanning electron microscope and XRD analysis techniques were used as microstructure. The experimental densities of the samples were measured by helium pycnometer. Hardness and transverse rupture strength properties are measured as mechanical properties. As a microstructure, a structure in which the reinforcing particles are partially homogeneously dispersed in the matrix is obtained. The B2O phase was formed in the AlCu-10hBN sample except for the components forming the composition. No other phase was formed in the other composites. The hardness and transverse rupture strength of the samples were significantly increased by particulate addition.