Metal matrix composites (MMCs) reinforced with nano-particles, known as Metal Matrix nano-Composites (MMnCs), are promising materials with enhanced mechanical and functional properties. These composites consist of a metal matrix reinforced with nano-particles, which can significantly improve wear resistance, damping properties, and mechanical strength. Commonly used matrix metals include Al, Mg, and Cu, while nano-particles such as carbides, nitrides, oxides, and carbon nanotubes (CNTs) are used as reinforcements. The main challenge in producing MMnCs is the low wettability of ceramic nano-particles by molten metal, which limits conventional casting methods. Alternative production techniques, such as ex situ and in situ methods, have been developed to overcome this issue. The mechanical properties of MMnCs are enhanced through various strengthening mechanisms, including load transfer, Hall-Petch, Orowan, and thermal/elastic modulus mismatch. These mechanisms contribute to improved strength, hardness, and ductility. The addition of nano-particles, especially CNTs, significantly enhances the mechanical and electrical properties of the matrix. However, the production of MMnCs requires careful control of particle dispersion and interfacial bonding to ensure optimal performance. Various methods, such as ultrasonic-assisted casting, semi-solid processes, and solid-state techniques like high-energy ball milling and equal-channel angular pressing (ECAP), have been employed to produce MMnCs. These methods enable the fabrication of high-quality composites with uniform particle distribution and enhanced mechanical properties. The use of ECAP and other severe plastic deformation techniques allows for the production of dense composites with fine microstructures. MMnCs have potential applications in aerospace, automotive, and electronics industries due to their high strength-to-weight ratio, improved thermal and electrical conductivity, and enhanced damping properties. Despite their promising properties, challenges remain in achieving consistent particle dispersion, interfacial bonding, and large-scale production. Further research is needed to optimize the synthesis and processing of MMnCs for commercial applications.Metal matrix composites (MMCs) reinforced with nano-particles, known as Metal Matrix nano-Composites (MMnCs), are promising materials with enhanced mechanical and functional properties. These composites consist of a metal matrix reinforced with nano-particles, which can significantly improve wear resistance, damping properties, and mechanical strength. Commonly used matrix metals include Al, Mg, and Cu, while nano-particles such as carbides, nitrides, oxides, and carbon nanotubes (CNTs) are used as reinforcements. The main challenge in producing MMnCs is the low wettability of ceramic nano-particles by molten metal, which limits conventional casting methods. Alternative production techniques, such as ex situ and in situ methods, have been developed to overcome this issue. The mechanical properties of MMnCs are enhanced through various strengthening mechanisms, including load transfer, Hall-Petch, Orowan, and thermal/elastic modulus mismatch. These mechanisms contribute to improved strength, hardness, and ductility. The addition of nano-particles, especially CNTs, significantly enhances the mechanical and electrical properties of the matrix. However, the production of MMnCs requires careful control of particle dispersion and interfacial bonding to ensure optimal performance. Various methods, such as ultrasonic-assisted casting, semi-solid processes, and solid-state techniques like high-energy ball milling and equal-channel angular pressing (ECAP), have been employed to produce MMnCs. These methods enable the fabrication of high-quality composites with uniform particle distribution and enhanced mechanical properties. The use of ECAP and other severe plastic deformation techniques allows for the production of dense composites with fine microstructures. MMnCs have potential applications in aerospace, automotive, and electronics industries due to their high strength-to-weight ratio, improved thermal and electrical conductivity, and enhanced damping properties. Despite their promising properties, challenges remain in achieving consistent particle dispersion, interfacial bonding, and large-scale production. Further research is needed to optimize the synthesis and processing of MMnCs for commercial applications.