Effect of Titanium/Reduced Graphene Oxide Nanocomposite as a New Filler on the Properties of Gas Tungsten Arc Welding of Titanium

چکیده مقاله

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Here, the effect of reduced graphene oxide nanosheets (RGO) on the microstructure and mechanical properties of titanium-welded joints is investigated through gas tungsten arc welding (GTAW). The prepared nanocomposite samples are evaluated by using light microscopy (LM), field emission scanning electron microscopy (FE-SEM) equipped with energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) analysis, and Raman spectroscopy. Besides, mechanical properties are investigated in terms of hardness and tensile strength. The obtained results indicated that by increasing the RGO volume fraction up to 1.9%, due to the decreasing of the grain size and probably reinforcing the grains, the tensile strength and hardness of welding are improved up to 30% and 78%, respectively. We found that these RGO nanosheets could pin the dislocations and improved the mechanical properties of the joints. Therefore, it can be concluded that the Ti/RGO composite filler can be act as an efficient filler for GTA welding of the titanium.