Investigation of Microstructure, Mechanical and Wear Behaviour of B4C Particulate Reinforced Magnesium Matrix Composites by Powder Metallurgy

Effect of Alumina (Al2O3) Particles on The Mechanical Properties of Magnesium (Mg)

“…The presence of MgO in the structure is attributed to high chemical activity between Mg and O during the sintering process [19].Ternary compound Al2MgO4 can be attributed to be formed by inter-lapping of these three elements on the boundaries between the matrix and Al2O3particles, because of Al2O3 unstable in Mg reacting to form spinel, Al2MgO4 reaction of the reinforcement. It can severely degrade the properties of the composite [20].…”

“…Hardness and stronger of Al2O3 particles which increases load-bearing capacity and effective transfer from soft matrix to solid reinforcement due to good interconnection. Hence the results in improvement of compressive strength [19] [22]. 3) Thermal stress and elastic modulus mismatch between the magnesium and Al2O3 particles could be because of high dislocation density presence of reinforcements increases.…”

“…The CUS because they cause inhomogeneous deformation and highdensity dislocations .The increase in dislocation density of the composite is related to mismatch of the elastic modulus (E of Mg and Al2O3 are 44 and 472 GPa, respectively [1]) and coefficient of thermal expansion (CTE of Mg is 27.1×10 −6 K −1 and Al2O3 particulates 7.4×10 −6 K −1 [23]) between the matrix and the reinforcement material. Therefore, this large difference in CTE and E values lead to the formation of dislocations and rise the strength [19]. And 4) The grain refinement might have an influence on Strength improvement [21].…”

“…b) the presence of hard Al2O3 particles which acts as a higher constraint to localized deformation of the matrix during indentation [24]. c) The homogenous distribution of hard Al2O3 particulates in soft Mg matrix [19].…”

Interfacial Phases in a Graphene-Doped Aluminum/B4C MMC

“…However, due to their low wear resistance they are often reinforced with hard ceramic particles such as boron carbide (B4C) [2]. Since the ceramic particles can damage the counter material [3], graphene nanoparticles were added to the surface of the B4C to improve the wear resistance and lubricity. In B4C reinforced aluminum alloys, silicon and other alloying elements are used to minimize the reaction between the aluminum and B4C [4].…”