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Additive Manufacturing: Beyond on the Beam IV: Poster Session
Sponsored by: TMS Materials Processing and Manufacturing Division, TMS: Powder Materials Committee, TMS: Additive Manufacturing Committee
Program Organizers: James Paramore, Texas A&M University; Daniel Lewis, Texas A&M University; Kyle Tsaknopoulos, Worcester Polytechnic Institute; Paul Prichard, Kennametal Inc.

Monday 5:30 PM
March 20, 2023
Room: Exhibit Hall G
Location: SDCC

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A-41: Redeposition and Grain Refinement of AA6061 Produced Using Additive Friction Stir Deposition: Michael Amling¹; Mark Weaver¹; Brian Jordon²; Paul Allison²; ¹University of Alabama; ²Baylor University
    This study investigates the saturation in grain refinement that occurs during the additive friction stir deposition (AFSD) process. To determine this limit of grain refinement, a large build of AA6061 was fabricated from wrought feedstock using the AFSD process, cut into feedstock, and redeposited with the same AFSD process. This process was repeated until the grain size plateaued. Electron backscatter diffraction (EBSD) on the scanning electron microscope (SEM) was used to quantify the change in grain size and orientation for each iteration. Transmission electron microscopy (TEM) was used to capture the precipitation behavior and contamination buildup with consecutive iterations of redeposition. Hardness tests were used to assess material softening or hardening due to grain size and precipitate changes. The results are discussed relative to state-of-the-art understanding of the AFSD process.

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