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Metal matrix composites reinforced by nano-particles are very promising materials, suitable for a large number of applications. These composites consist of a metal matrix filled with nano-particles featuring physical and mechanical properties very different from those of the matrix. The nano-particles can improve the base material in terms of wear resistance, damping properties and mechanical strength. Different kinds of metals, predominantly Al, Mg and Cu, have been employed for the production of composites reinforced by nano-ceramic particles such as carbides, nitrides, oxides as well as carbon nanotubes. The main issue of concern for the synthesis of these materials consists in the low wettability of the reinforcement phase by the molten metal, which does not allow the synthesis by conventional casting methods. Several alternative routes have been presented in literature for the production of nano-composites. This work is aimed at reviewing the most important manufacturing techniques used for the synthesis of bulk metal matrix Nano composites. Moreover, the strengthening mechanisms responsible for the improvement of mechanical properties of nano-reinforced metal matrix composites have been reviewed and the main potential applications of this new class of materials are envisaged. The fatigue properties of AMCs are affected by poor toughness ,low ductility, and resistant to crack growth which is attributed to the reinforcement particles, sizes, and shapes, because the crack growth rate behavior of the composite displays a markedly higher sensitivity to the applied stress intensity (K) than observed in most metals. The use of nano-sized ceramic particles has been reported to strengthen the metal matrix, while maintaining good ductility, high temperature creep resistance, and better fatigue. Based on this background, fatigue properties of Al-Si-Mg/palm kernel shell ash nanoparticles (PKSAnp) was investigated. Sol-gel method was used in the production of the PKSAnp; 4 wt% of PKSAnp was added to Al-7%Si-0.3%Mg alloy to produce A356/4 wt% PKSAnp composites; fatigue properties were determined as per ASTM E466; microstructure of the composite was determined using a scanning electronic microscope; ANSYS bench work software was used determined the factor of safety and fatigue life. The presence of PKSAnp in the alloy has great influences that alter the number of cycles obtained for the composite even at higher temperature. The presence of PKSAnp shifted the curve to a higher number of cycle before failure. The result shows that failure of the alloy will occur before the design life is reached since the minimum value obtained for the alloy is less than one.