摘要
通过对工件磨损率、摩擦系数和磨损形貌的分析,探究了双液淬火下速度和载荷对7A09铝合金干滑动摩擦磨损性能的影响。采用单因素法对双液淬火下的7A09铝合金进行干滑动摩擦磨损试验,并借助OM、SEM、XRD和EDS等仪器分析了该铝合金的相组成与磨损机制。结果表明:该合金的摩擦系数随速度和载荷的增大而减小,且随时间变化的波动较小,具有较高的稳定性;而磨损率的变化则与之相反,其随速度和载荷的增加而增大。此外,当工件处于低速轻载工况时,因工件与摩擦副的表面都存在微凸体,该微凸体相当于在摩擦面间存在磨粒,致使工件产生了磨粒磨损;当速度和载荷继续增大时,磨损机制由磨粒磨损逐渐转变为黏着磨损;而当工件处于高速重载工况时,由于接触点的塑性变形大以及表面温度高,使黏着点的强度和面积增大,产生胶合磨损。同时,因摩擦表面温度升高,致使工件出现一定程度的氧化磨损。
By analyzing the wear rate,friction coefficient and wear morphology of the workpiece,the effects of speed and load on the dry sliding friction and wear properties of 7A09 aluminum alloy under double liquid quenching were explored.The dry sliding friction and wear test of 7A09 aluminum alloy under double liquid quenching was performed by single factor method,and the phase composition and wear mechanism of the aluminum alloy were analyzed by OM,SEM,XRD and EDS.The results showed that the friction coefficient of the alloy decreased with the increase of speed and load,and had less fluctuation with time,and had higher stability.On the contrary,the change of wear rate increased with the increase of speed and load.In addition,when the workpiece was in a low-speed and light-load condition,micro-convex bodies exist on the surface of the workpiece and the friction pair,and the micro-convex bodies were equivalent to the existence of abrasive particles between the friction surfaces,which caused abrasive wear.When the speed and load continue to increase,the wear mechanism gradually changed from abrasive wear to adhesive wear.When the workpiece was under high-speed and heavy-load conditions,due to the large plastic deformation of the contact point and the high surface temperature,the strength and area of the adhesive point increased,resulting in adhesive wear.At the same time,due to the increase of friction surface temperature,the workpiece appears a certain degree of oxidation wear.
作者
罗恒
王优强
张平
LUO Heng;WANG Youqiang;ZHANG Ping(Mechanical and Automotive Engineering,Qingdao University of Technology,Qingdao 266520,China;School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2020年第24期24109-24113,共5页
Materials Reports
基金
国家自然科学基金(51575289,51705270)
山东省自然科学基金(ZR2016EEP03)。
关键词
7A09铝合金
双液淬火
摩擦系数
磨损率
磨损机制
7A09 aluminum alloy
double liquid quenching
friction coefficient
wear rate
wear mechanism
