J. T. Wang, A. X. Liu, Y. K. Zhang, L. Xie, M. T. He, K. Y. Luo, K. J. Hu
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Influence of Process Parameters on Wear Resistance of Surfaces Modified by Friction Stirring Processing in 7075 Aluminum Alloy
7075 aluminum alloy has significant attraction in the field of lightweight materials, but its poor wear resistance limits its application. Therefore, in this study, the optimal wear-resistant weld seam was prepared by adjusting the FSP (Friction Stir Processing). Friction and wear tests were conducted to analyze the wear resistance of the weld seam. Additionally, XRD, SEM, and TEM were used for phase analysis and microstructural characterization of the weld seam. The treated specimens exhibited the significantly higher wear rate and average coefficient of friction during the stabilization stage of samples W1 (welded rate: 60 mm/min; rotation rate: 1000 rpm) and W8 (welded rate: 80 mm/min; rotation rate: 1200 rpm), with increases of 45% and 40% for the wear rate, respectively, and 19% and 13% for coefficient of friction in comparison with the untreated material. The optimized FSP parameters can considerably improve the wear resistance of the material by affecting the heat input, which altered the grain size and distribution in the welded zone. X-Ray diffraction and scanning electron microscopy/energy dispersive spectroscopy studies provided the mechanism underlying grain size and plastic nano twin structures contributions to wear resistance.
期刊介绍：
Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.
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