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Submicrometer boron carbide particles with different volume fraction (2%~6%) reinforced Al matrix composites were prepared by multi-stage vacuum hot pressing and hot extrusion.MMU-10G pin on disk wear test machine was used to conduct friction and wear tests of the same volume fraction submicrometer B4Cp/2009Al and SiCp/2009Al composites, tribological properties of two kinds of composites were analyzed.