Author(s): Ekwedigwe CM, Okoye CN, Madubogwu IJ and Nwambu CN

Abstract: The study focused on the damage tolerance of brass (Cu-30wt%Zn alloys) doped with molybdenum (Mo) and magnesium (Mg). The alloy was incorporated with varying concentrations (0.1- 0.5wt% and 1.0-5.0wt% at 0.1 and 1.0 intervals respectively) of molybdenum and magnesium and fabricated using a stir-casting technique. The hardness and impact strength were examined using a portable dynamic hardness testing machine (Model: DHT-6) and a pendulum impact testing machine (Model: U1820). The microstructures of the cast alloys were analyzed using an optical microscope (OM), Scanning electron microscope (SEM), and Energy dispersive spectroscope (EDS). Results depict that the additions of molybdenum and magnesium modified the structure of the alloy resulting in improvements of hardness and impact strength of the alloy by 53.4% and 49.1% respectively. The microstructure study revealed the existence of the fine stable phase, the intermetallic phases, and the primary α-phase which resulted in the improved mechanical properties.

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