不同冲蚀速度下过共晶Al-Mn合金及复合材料冲蚀磨损性能的研究

Study on Erosion Wear of Hypereutectic Al-Mn Alloy and Composite Materials with Different Erosion Speed

采用MSN型冲蚀磨损试验机,在3.5 m/s及7 m/s线速度及四种磨粒粒度下,对Al-2.86%Mn合金及Al2O3颗粒增强Al-2.77%Mn复合材料进行冲蚀磨损对比试验,分析试样材料的组织特征及冲蚀磨损后的磨痕形貌。结果表明:Al-2.86%Mn合金的主要成分是Al-Mn化合物(MnAl6和Al11Mn)4和Mn在Al中的固溶体,复合材料是在此基础上分布着Al2O3颗粒。材料的磨损失重率随冲蚀速度的变大明显增加;在相同速度下二者的冲蚀磨损程度随着磨粒粒度的增大呈先增大后减小的趋势,且峰值随着速度的变大向粒度增大的方向偏移;在相同试验参数下Al-2.77%Mn复合材料的抗冲蚀磨损性能要优于Al-2.86%Mn合金。

The erosion wear of A1-2.86% Mn alloy and A1203 particle reinforced A1-2.77% Mn composite materials under the linear velocity of 3.5 m/s and 7 m/s and four different grain sizes were researched in this study. The equipment in this experiment was MSN type erosion tester. The microstructure and wear surface of sample material after erosion-abrasion were analyzed. The results show that the A1-Mn alloy is mainly composed of aluminum-manganese solid solution phase, MnA16 and AlllMn4 phase, while-A1203 particles can be observed in the composite besides the mentioned microstructre. The wear weight loss rates of the two materials were increased significantly when the erosion speed increased. With the size of abrasive particle increasing, the erosion rate of sample material firstly increased and then decreased. The peak shifted to the direction of the increase of particle size under the same speed. A1-2.77%Mn composite material was superior to A1-2.86%Mn alloy in aspect of resistance to erosion wear under the same test conditions.