Abstract
In this work, surface layer properties of AA7075 aluminum alloys’ ultrasonic impact peened at different treatment times are investigated. Three different layers were found on the ultrasonic impact–treated surface of AA7075 aluminum alloys. The thicknesses of the layers increase with an increase in the treatment time or deformation amount. X-ray diffraction patterns indicate that the treated surfaces have no different phases from base material and are in the face-centered cubic phase. The highest hardness values of all treated AA7075 aluminum alloys were determined in nanocrystallization layer, which is the top layer of the surface because of the grain refinement and work hardening. A sharp increase at the residual stresses occurs, increasing the deformation time and amount because of the surface enlargement.
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Schedule a callMore From: Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture
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