1.1 Basic HistoryComposite material is a multi-phase material that can be obtained through the artificial combination of two or more different materials to achieve properties that the individual components alone cannot achieve. Composite materials can be modified for many properties by appropriately choosing their components, proportions, distributions, morphologies and degrees of crystallinity, crystallographic textures, structure and composition of the interface between the components. Thanks to these properties, composite materials can be designed to meet the needs of technologies related to aerospace, automotive, electronics, construction, energy, biomedical and other sectors. Therefore, composite materials have been mainly used as commercial engineering materials [1]. There are a few types of composites that can be classified based on the matrix material such as a polymer matrix composite (PMC), a metal matrix composite (MMC), and a ceramic matrix composite (CMC). Besides that, the composite can also be classified based on the shape of the filler or reinforcement, for example a composite which has particles as filler is called particulate composite and a composite with fibers is called fibrous composite [1]. Metal matrix The composite (MMC) is a composite that contains a continuous metal matrix and a small percentage of the material by volume represents the reinforcement [2]. MMC offers some unique mechanical properties such as low density, high strength and high stiffness, high wear resistance and other interesting properties. It can also offer exceptional properties compared to those of any unreinforced alloy [2]. Metal matrix composites can also be classified into different particles…half of paper…Al2O3 uniformly in the aluminum matrix and for its ability to fabricate the material into almost any shape [3].1.3 Objectives1. 3.1 Fabricate aluminum metal matrix composite reinforced with alumina particles using powder metallurgy technique.1.3.2 Investigate the effect of different weight percentages of alumina particles on the physical and mechanical properties of aluminum metal matrix composite .1.4 Scope of Study The aim of this project is to study the effect of different weight percentage of reinforcement (0 wt%, 5 wt%, 10 wt%, 20 wt% and 30 wt%) of the alumina particles on the aluminum metal matrix composite. The composite will be fabricated using the powder metallurgy technique which includes the process of mixing, compaction and sintering. The tests envisaged in this project concern microstructural analysis, density, porosity, hardness and coefficient of thermal expansion (CTE).