Abstract
7A52 aluminum alloys were treated by ultrasonic shot peening (USSP) technology. Then, friction and wear behavior of 7A52 aluminum alloys was obtained by a ball-on-disk friction and wear test. The surface grains of the 7A52 aluminum alloys were refined into nanocrystals with an average size of about 23 nm, and a severe plastic deformation zone with a thickness of about 100 μm was produced by USSP treatment. Compared with the un-USSP specimen, the coefficient of friction (COF) values of the USSP-treated specimen were obviously decreased by 18.04%, 9.09%, 8.67%, 15.79% under the friction load of 5 N, 10 N, 30 N and 50 N. As the wear load increases, the specimens before and after treatment show different wear mechanisms.
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