【摘要】 采用旋转冲蚀磨损试验研究了在7m·s-1和15m·s-1冲蚀速度下Al-2.15%Mn合金和Al2O3颗粒增强Al-2.06%Mn合金基复合材料的冲蚀磨损性能,分析了材料的组织特征及冲蚀磨损后的表面形貌。结果表明:Al-2.15%Mn合金组织由锰在铝中的固溶体及铝锰化合物(MnAl6和Al11Mn4相)组成;复合材料的组织在前者基础上,增加了Al2O3颗粒;两种材料在15m·s-1冲蚀速度下的冲蚀磨损率是7m·s-1下的20~30倍,冲蚀速度是影响磨损率的主要因素;两种材料在磨料加入量为3%时的磨损率均高于1%时的,且随磨料粒径的增加冲蚀磨损率均先增大后减小;在3%磨料加入量下,其冲蚀磨损率极大值均随冲蚀速度的增加向大粒径方向移动;均匀分布于基体中的Al2O3颗粒能起到弥散强化的作用,因此复合材料表现出更优良的抗冲蚀性能。更多还原

【Abstract】 The erosion-abrasion wear properties of eutectic Al-Mn alloy and its Al2 O3 particle reinforced composites were studied at erosion-abrasion rate of 7m·s-1 and 15m·s-1 in rotating erosion-abrasion wear test, and the microstructure characteristics and the worn surface of the materials after erosion-abrasion wear test were analyzed.The results show that,the cast Al-Mn alloy was composed of Al-Mn solid solution,MnAl6 and Al11 Mn4 phase,while Al2 O3 particles appeared in the composite besides the aforementioned microstructure.The wear rate at the erosion-abrasion rate of 15m·s-1 was 20to 30times as large as the wear rate at the erosion-abrasion rate of 7m ·s-1 for two materials.And the major factor of wear rate was erosion-abrasion rate.The wear rates of both materials were higher with 3% abrasive addition than with 1% abrasive addition,and exhibited increase first then decline with increase of abrasive diameter.The maximum wear rate moved toward the abrasive in larger diameter with increase of erosion-abrasion rate when abrasive addition was 1%.The Al2 O3 particle reinforced composite exhibited a good erosion-abrasion wear resistance because of dispersion strengthening of Al2 O3 particles distributed uniformly in matrix at same erosion-abrasion conditions.更多还原