铝锰合金及其复合材料高速干滑动摩擦磨损特性研究

发布时间：2018-05-17 04:38

本文选题：Al-Mn合金 + 颗粒增强复合材料　；参考：《新疆大学》2012年硕士论文

【摘要】：若要促进农田灌溉节水工程的进行，就需要制备出具备优良耐磨性能的新型材料，以代替传统单一材料，以期延长其使用寿命，降低其成本。故本文致力于研究具有优良耐磨性能的铝锰合金及其复合材料的耐摩擦磨损性能。本文采用M18XHF22-SRA型X射线衍射仪(XRD)检测物相；采用M-2000型试验机对铝锰合金及其复合材料进行高速干滑动摩擦磨损性能试验；采用TG328A(S)型电光分析天平称量试样的磨损量；采用LED-1430VP型扫描电镜(SEM)观察获取材料的磨痕形貌。如此对铝锰合金及其复合材料的内部结构、机械性能等进行分析比较；对不同锰含量的铝锰合金及其复合材料在不同压力下进行高速摩擦磨损试验；对试样的摩擦系数进行分析比较；对磨损过的试样进行磨损量的对比及磨痕的分析比较。结果表明：Al-Mn合金的金相组织为：随着锰含量的增加，第二相铝锰化合物的形态由细变粗、由长变短、头部由圆变方而且与基体连接不紧密，内部有裂纹；Al_2O_3颗粒增强铝锰基复合材料的金相组织为：由锰在铝中的固溶体和在其上分布的铝锰化合物MnAl6和A111Mn4及δ-Al_2O_3颗粒组成；随着锰含量的增加，试样中硬而脆的MnAl6化合物和A111Mn4化合物的含量不断增加，而δ-Al_2O_3颗粒含量基本上保持不变，使得铝锰复合材料的组织更加紧密，其硬度与铝锰合金相比有一定的增加。在同一载荷之下，Al_2O_3颗粒增强铝锰基复合材料的磨损量都要低于相应的铝锰合金。随着载荷的增加，，两种试样的磨损程度都会加剧，但是复合材料的增幅及磨损的程度要小，这表明了Al_2O_3颗粒的加入对铝锰复合材料的滑动摩擦磨损性能的提高起到了有益的作用。
[Abstract]:In order to promote the water saving project of farmland irrigation, it is necessary to produce a new material with excellent wear resistance, which can replace the traditional single material in order to prolong its service life and reduce its cost. Therefore, this paper is devoted to study the friction and wear resistance of Al-Mn alloy and its composites with excellent wear resistance. In this paper, M18XHF22-SRA X-ray diffractometer was used to detect phase, M-2000 test machine was used to test the friction and wear properties of Al-Mn alloy and its composites, and TG328AZS was used to analyze the wear capacity of weighing samples. LED-1430VP scanning electron microscope (SEM) was used to observe the wear marks of the obtained materials. The internal structure and mechanical properties of Al-Mn alloy and its composites are analyzed and compared, and the high speed friction and wear tests of Al-Mn alloy and its composites with different manganese content under different pressure are carried out. The friction coefficient of the specimen is analyzed and compared, and the wear quantity and the wear mark of the worn sample are compared. The results show that with the increase of mn content, the morphology of Al-Mn compounds in the second phase changes from fine to coarse, from long to short, and the head of the alloy changes from circular to square and is not closely connected with the matrix. The microstructure of Al _ 2O _ 3 / Al _ 2O _ 3 composite reinforced by Al _ 2O _ 3 particles is: composed of manganese solid solution in aluminum and aluminum-manganese compounds MnAl6 and A111Mn4 and 未 -Al _ 2O _ 3 particles distributed on it; with the increase of manganese content, The contents of hard and brittle MnAl6 compounds and A111Mn4 compounds in the samples are increasing continuously, while the content of 未 -Al _ 2O _ 3 particles remains basically unchanged, which makes the microstructure of Al-Mn composites more compact, and the hardness of the composites increases to a certain extent than that of Al-Mn alloys. Under the same load, the wear rate of Al _ 2O _ 3 / Al _ 2O _ 3 composite is lower than that of the corresponding Al-Mn alloy. With the increase of load, the wear degree of both specimens will increase, but the increase of composite material and the degree of wear will be small. This indicates that the addition of Al_2O_3 particles plays a beneficial role in improving the sliding friction and wear properties of Al-Mn composites.
【学位授予单位】：新疆大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH117.1

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