Dry Sliding Friction and Wear Properties of 7A09 Aluminum Alloy Under Double Liquid Quenching
LUO Heng1, WANG Youqiang1, ZHANG Ping2
1 Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China 2 School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China
Abstract: 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.
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2020, Vol. 34 
