Abstract：The metallographic structures of Al-Mn eutectic alloy and its composite were investigated by XRD and SEM. The mass loss, friction coefficient and wear trace of the samples were studied under three different kinds of friction conditions. And their properties of erosion resistance were analyzed by SEM and EDS. The results show that the shapes of brittle Al-Mn compounds are changed as Al2O3 particle is added. The mass loss and friction coefficient of the samples under corrosive liquid and abrasive condition are less than those under corrosive liquid condition, but higher than those under dry sliding condition. The pits of samples under corrosive liquid condition are more than those under corrosive liquid and abrasive condition, and the furrows of samples under corrosive liquid and abrasive condition are deeper than those under dry sliding condition by observing wear traces. As the particle size of abrasive increases, wear rates of erosion samples increase first and then decrease in 7m/s erosion speed, but decrease gradually in 3.5m/s. In addition, the mass of Al-Mn eutectic alloy samples increase after the erosion test under the 3.5m/s erosion speed and 0.15-0.212mm particle size condition.
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