多相流冲击速度对铝锰合金冲刷腐蚀性能影响的研究.docVIP

冲蚀速度对共晶铝锰基复合材料冲蚀 磨损性能的影响( 张曼，刘炳 (新疆大学机械工程学院,乌鲁木齐 830047) 摘要：采用旋转冲蚀磨损Al-2.15%Mn合金和Al2O3颗粒增强Al-2.06%Mn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磨损表面形貌。结果表明：Al-2.15%Mn合金组织为锰在铝中的固溶体及铝锰化合物（MnAl6和Al11Mn4 相）；Al2O3颗粒增强Al-2.06%Mn复合材料的组织在与前者相似的基础上分布着 Al2O3 颗粒。两种材料在15m/s的冲蚀速度下的冲蚀率是7m/s下的20到30倍。两种材料在3%磨粒加入量下的质量损失率均高于1%磨粒加入量，随着粒径的增加两种材料的质量损失率均先增大后减小；且在1%磨粒加入量下其极大失重率随着冲蚀速度的增加向粒径大的方向移动。复合材料在15m/s的冲蚀速度下微观形貌为犁沟状，而铝锰合金为喇叭状。在相同冲蚀条件下，复合材料均表现出更优良的抗冲蚀性能。 关键词：Al-Mn共晶合金；颗粒增强复合材料；冲蚀磨损；冲蚀速度 中图分类号 TB331 文献标志号码 A Effect of Erosion-abrasion Rate on Erosion Wear Properties of Eutectic Al-Mn Matrix Composites Zhang Man, Liu Bing (School of Mechanical Engineering, Xinjiang University , Urumqi 830047, China) Abstract: The erosion-abrasion properties of eutectic Al-Mn alloy and its Al2O3 particulate reinforced composites were studied at erosion-abrasion rate of 7m/s and 15m/s by rotating erosion-abrasion test, and the microstructure characteristics and worn surface of materials after erosion-abrasion test were analyzed. The results show that, the as-cast Al-Mn alloy is composed of Al-Mn solid solution, MnAl6 and Al11Mn4 phase, while δ- Al2O3 particles are in the composite besides the aforementioned microstructure. The wear lost rate of them under the erosion-abrasion speed of 15m/s is 20 to 30 times over the speed of 7m/s. And with the 3% abrasive addition is higher than that of ones with the 1% abrasive addition. The weight loss rate of the two materials is firstly increased and then decreased with the increase of abrasive particle size, moreover, with the increase of erosion-abrasion speed the maximum wear loss rate of 1% abrasive contents moves toward the larger particle size. The morphology of the composites materials in erosion speed of 15m/s is furrow-shaped while the Al-Mn alloy is trumpet-shaped. Under the same conditions composites materials have a better anti-erosion performance. Key Words: eutectic Al-Mn alloy; particulate reinforced composites; erosion-abrasion wear; erosion-abrasion rate