In this study, the effect of anhydrous borax (SB) on the mechanical properties of Etial 150 (EA150) aluminum alloy and also the effects of the composite material production method on the mechanical properties were investigated. In this context, EA150 was melted in the same crucible together at the rate of 1% and 5% by volume anhydrous borax (Na2B4O7) in order to give different mechanical properties to the final product (EA150 / SB composite material). In addition, SB and EA150 aluminum alloys were mixed after being melted separately and the effect of different production methods on mechanical properties was also investigated. Metal matrix composite materials were produced by using different production parameters like melting temperature of 800oC and 1000oC, a holding time at a melting temperature of 40 minutes and 60 minutes, using the non-pressure casting method. By applying hardness and three-point bending tests to the test specimens, the flexural yield stress, flexural yield extension, and Brinell hardness values of the composite materials were determined. In addition, the microstructure of the fracture surfaces was examined by scanning electron microscopy (SEM). While all parameters were effective (positive and/or negative) on the bending yield stress, bending yield strain, and hardness values of the composite materials produced, it was determined that the production method was the most effective parameter on the mechanical properties.