过共晶Al-Mn基复合材料的冲蚀磨损性能

Erosion Wear Properties of Hypereutectic Al-Mn Matrix Composites

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。

Hypereutectic Al-Mn alloy and its Al2O3 particulate reinforced composites were prepared by stirring casting,and the microstructure of the two materials prepared was observed.Meanwhile,it was paid attention to the effects of different abrasive content and abrasive particle size on the erosion wear resistance of the two materials prepared.The results show that the Al-Mn alloy is mainly composed of aluminum-manganese solid solution phase,MnAl6 and Al11Mn4 phase,while δ-Al2O3 particles can be observed in the composite besides the mentioned microstructure.The wear loss rate of the two materials with the 3% abrasive addition is obviously higher than that of ones with the 1% abrasive addition.In addition,the weight loss rate of the two materials is firstly increased and then decreased with the increase of abrasive particle size.Furthermore,with the increase of abrasive contents,the maximum of wear loss rate moves toward the larger particle size.In addition,hypereutectic Al-Mn matrix composite is much better than hypereutectic Al-Mn alloy in erosion wear resistance with the same Mn content.