The current work focuses on the influence and contribution of multi-walled carbon nanotube (MWCNT) and boron carbide (B4C) to the mechanical and corrosion properties of copper matrix composites. Different weight fractions of nano- B4C and MWCNT-reinforced copper composites were prepared using the ultrasonic-assisted stir casting methodologies. Various tests such as density, tensile, compression, hardness, and corrosion were conducted as per ASTM standards. The addition of reinforcements showed enhancements in the mechanical properties such as tensile strength, compressive strength, hardness and corrosion resistance of the composites due to the uniform dispersion of the secondary reinforcement in the copper matrix and the self-lubricating effect of the MWCNTs. Further, the weight of the composites decreased with the strength characteristics increasing leading to the enhancement in strength to weight ratios of the composite specimens. The effects of the nanoparticle distribution in the matrix and the dispersion of the composites were characterized using high-resolution scanning electron microscopy. The results of experiments highlight the use of experiential reinforcing limits of B4C on the mechanical behavior and corrosion characteristics of copper composites.