Microstructure Evolution of Al6061 Alloy Made by Additive Friction Stir Deposition |
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| Authors: | Congyuan Zeng Hamed Ghadimi Huan Ding Saber Nemati Abdelrahman Garbie Jonathan Raush Shengmin Guo |
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| Affiliation: | 1.Department of Mechanical & Industrial Engineering, Louisiana State University, Baton Rouge, LA 70803, USA; (H.G.); (H.D.); (S.N.); (S.G.);2.Department of Mechanical Engineering, University of Louisiana at Lafayette, Lafayette, LA 70503, USA; (A.G.); (J.R.) |
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| Abstract: | ![]()
In this paper, the phase structure, composition distribution, grain morphology, and hardness of Al6061 alloy samples made with additive friction stir deposition (AFS-D) were examined. A nearly symmetrical layer-by-layer structure was observed in the cross section (vertical with respect to the fabrication-tool traversing direction) of the as-deposited Al6061 alloy samples made with a back-and-forth AFS-D strategy. Equiaxed grains were observed in the region underneath the fabrication tool, while elongated grains were seen in the “flash region” along the mass flow direction. No clear grain size variance was discovered along the AFS-D build direction except for the last deposited layer. Grains were significantly refined from the feedstock (~163.5 µm) to as-deposited Al6061 alloy parts (~8.5 µm). The hardness of the as-fabricated Al6061 alloy was lower than those of the feedstock and their heat-treated counterparts, which was ascribed to the decreased precipitate content and enlarged precipitate size. |
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| Keywords: | additive manufacturing additive friction stir deposition Al6061 alloy microstructure heat treatment hardness |
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