双液淬火下7A09铝合金的干滑动摩擦磨损性能

doi:10.11896/cldb.19110066

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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.

Key words： 7A09 aluminum alloy double liquid quenching friction coefficient wear rate wear mechanism

Published: 24 December 2020

CLC number:

TG146.21

Fund:This work was financially supported by the National Natural Science Foundation of China (51575289,51705270), the Natural Science Foundation of Shandong Province (ZR2016EEP03).

About author:: Heng Luo received his bachelor′s degree in July 2017 from Xi′an University of Architecture and Technology. He began to study for a master′s degree in Qingdao University of Technology in September 2018, mainly engaged in the research of light alloy processing technology and properties, material damage and fracture.
Youqiang Wang, professor, doctoral supervisor. He graduated from China University of Petroleum (Beijing) in Mechanical and Electrical Engineering in June 1999, and obtained a Ph.D. in mechanical design and theory. He is mainly engaged in the research of the surface modification and corrosion mechanism of different metal material friction pairs and the research of mechanical processing. He has published more than 200 articles in important journals at home and abroad, of which 12 are indexed by SCI, 30 are indexed by EI, and more than 100 core Chinese journals.

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Cite this article:

LUO Heng,WANG Youqiang,ZHANG Ping. Dry Sliding Friction and Wear Properties of 7A09 Aluminum Alloy Under Double Liquid Quenching[J]. Materials Reports, 2020, 34(24): 24109-24113.

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http://www.mater-rep.com/EN/10.11896/cldb.19110066 OR http://www.mater-rep.com/EN/Y2020/V34/I24/24109

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