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采用搅拌铸造法制备出过共晶Al-Mn合金和Al2O3颗粒增强过共晶Al-Mn基复合材料,分析了两种材料的组织结构,着重研究了不同磨粒加入量和不同磨粒粒度对两种材料抗冲蚀磨损性能的影响。结果表明,Al-Mn合金主要由Mn在Al中的固溶体和Al-Mn化合物(MnAl6及Al11Mn4相)组成,而复合材料的组织结构是在与前者相近的基础上分布着Al2O3颗粒;两种材料在3%磨粒加入量的磨损率明显高于1%磨粒加入量的磨损率;在两种磨粒加入量下两种材料的磨损率随着磨粒粒度的增大均呈现出先增大后减小的趋势,且随着磨粒加入量增加磨损率极大值向粒径大的方向移动。此外,在Mn含量相近的条件下,Al2O3颗粒增强过共晶Al-Mn基复合材料的抗冲蚀磨损性能优于过共晶Al-Mn合金。
The hypereutectic Al-Mn matrix composites reinforced by hypereutectic Al-Mn alloy and Al2O3 particles were prepared by stirring casting method. The microstructure of the two materials was analyzed. The effects of different abrasive additions and different abrasive grain sizes Impact of Erosion and Wear Properties of Two Materials. The results show that Al-Mn alloy is mainly composed of solid solution of Mn in Al and Al-Mn compounds (MnAl6 and Al11Mn4 phases), while the microstructure of Al-Mn alloy distributes Al2O3 particles on the same basis as the former. The wear rate of the 3% abrasive particles was obviously higher than that of 1% abrasive particles. The wear rates of the two materials increased with the increase of the particle size After the reduction trend, and with the increase in the amount of abrasive wear the maximum value of the wear rate moving in the direction of larger particle size. In addition, the wear resistance of Al 2 O 3 particles reinforced hypereutectic Al-Mn-based composites is better than that of hypereutectic Al-Mn alloys under similar Mn content.