Adib Afriansyah, Dionysius J. D. H. Santjojo, Istiroyah
Automotive part such a block machine, piston crowns, piston rings, and piston-cylinder are made by Aluminum Alloy 6061 that has a standard of hardness. Several parts of the piston require a joint under a welding process which unfortunately decreases mechanical properties of the joint welding area, especially the hardness. The high temperature causes the reduction of hardness during TIG Welding process. RF-DC plasma nitriding with a gas ratio of 70% Nitrogen and 30 % Argon at low temperatures below 200°C can elevate the hardness of the welding joint. The highest increase of the hardness was achieved by 4 hours nitriding. EDS result showed an increase of nitrogen in their lattice. Solid solution hardening mechanism in this plasma nitriding process was occurred because of the strained lattice of aluminum. © 2019 Author(s).
Department of Physics, Faculty of Mathematics and Natural Sciences, Brawijaya University, Jl. Veteran, Malang, 65145, Indonesia; Collaborative Research Centre for Advanced Systems and Material Technology, Brawijaya University, Jl. Veteran, Malang, 65145, Indonesia
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