Ceramic reinforced metal based materials have higher wear resistance, stiffness and specific strength than commercial metal alloys. Due to their high strength to weight ratios, their use is increasing in the automobile and aviation industries. In particular, these materials for aircraft structural parts, as a requirement of the damage tolerance design fatigue crack initiation and fatigue crack growth rate is expected to be very well-characterized. In this study, fatigue crack behavior of a silicon carbide particulate (SiCp) reinforced aluminium (Al) matrix composite materials were investigated in terms of fatigue crack growth rate and effective crack growth mechanisms under single overloads applied during constant amplitude loading. Aluminium alloy without reinforcement and 5% SiC reinforced composite materials were produced by using the powder metallurgy method and extrusion was applied as a secondary process. Tension and fatigue tests were carried out to investigate the mechanical behavior of the material produced. To investigate the effect of single overloads, experiments were conducted on reinforced and unreinforced materials at different single overload rates (OLR). Although the fatigue crack growth retardation is observed all of the OLR values between OLR=1.25-1.75, the crack growth retardation is increased by the increase of the OLR value.