Akademik Veri Yönetim Sistemi
13thInternational Materials Symposium (IMSP’2010), Denizli, Türkiye, 13 - 15 Ekim 2010, ss.15-23
İn this study, AA2024 aluminium alloy matrix and boron carbide reinforced particulate composites were manufactured using stir casting method. Two different size range of particles were used (i.e. 90-53pm and 49-16,5pm) for manufacturing. For each group of composites, containing 3%, 4%, 6%, and 7% of B4C particles in volüme, were manucfactured by using vortex method and permanent mold casting techniques. Tensile and hardness tests were conducted for composites at room temperature. The microstructure and fracture surface of the specimens were characterized using scanning electron microscopy. The microstructure observations shovved that dispersion of the larger size particles was more uniform while fıner particles. When the partide volüme fraction was increased, the macro hardness of both groups of composites was increased. But this increase vvas significant for fıner particles. The yield, the tensile strength and the elongations of the composites were decreased while the young modulus increased with increasing partide volüme fraction.The fracture surface of composites containing sınailer size of B4C particles e.xhibits interfacial decohesion at the clustered regions due to intense local stress concentration at tlıese large deffects. On the other hand, the fracture mode of composites, containing larger particles. includes ductile failure of the matrix and local br itti e fracture of B4C particles.