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In this study,Al matrix composites reinforced by 7.5 and 15 vol.%B_4C particles and also monolithic Al(Al without the B_4C particles) were produced by wet attrition milling and subsequent hot forward extrusion processes.The microstructure of the composites,evaluated by scanning electron microscopy(SEM),showed that the B_4C particles were properly distributed in the Al matrix.Mechanical properties of the AI/B_4C composites and monolithic Al were investigated by tensile,wear and hardness tests.The results revealed that with increasing content of B_4C particles,the tensile strength and microhardness of composites increased but the elongation decreased.In addition,the tensile strength and microhardness of composite samples were higher than those of monolithic Al.The density measurements revealed that the density of composites decreased with increasing content of the B_4C particles.
In this study, Al matrix composites reinforced by 7.5 and 15 vol.% B_4C particles and also monolithic Al (Al without the B_4C particles) were produced by wet attrition milling and subsequent hot forward extrusion processes.The microstructure of the composites, evaluated by scanning electron microscopy (SEM), showed that the B_4C particles were properly distributed in the Al matrix. Mechanical properties of the AI / B_4C composites and monolithic Al were investigated by tensile, wear and hardness tests. The results revealed that with increasing content of B_4C particles the tensile strength and microhardness of composites increased but the elongation decreased. In addition, the tensile strength and microhardness of composite samples were higher than those of monolithic Al. density test revealed the density of composites decreased with increasing content of the B_4C particles .