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Publication alert: Microstructure Evolution of Al6061 Alloy Made by Additive Friction Stir Deposition

August 2, 2022 • Events, front_page

LAMDA Publication alert!

 

“Microstructure Evolution of Al6061 Alloy Made by Additive Friction Stir Deposition,” authored by LAMDA researchers and graduate students from LSU and ULL: Congyuan Zeng, Hamed Ghadimi, Huan Ding, Saber Nemati, Abdelrahman Garbie, Jonathan Raush, and Shengmin Guo.

 

Materials 2022, 15(10), 3676, https://www.mdpi.com/1996-1944/15/10/3676/htm.

 

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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