Additive Manufacturing: Beyond the Beam III: Poster Session
Sponsored by: TMS Materials Processing and Manufacturing Division, TMS: Powder Materials Committee, TMS: Additive Manufacturing Committee
Program Organizers: Brady Butler, US Army Research Laboratory; Peeyush Nandwana, Oak Ridge National Laboratory; James Paramore, US Army Research Laboratory; Nihan Tuncer, Desktop Metal; Markus Chmielus, University of Pittsburgh; Paul Prichard, Kennametal Inc.

Tuesday 5:30 PM
March 1, 2022
Room: Exhibit Hall C
Location: Anaheim Convention Center

J-23: Additive Friction Stir Deposition of Al0.04CoCrFeNi High Entropy Alloy: Michael Amling1; Malcolm Williams1; Paul Allison1; Mark Weaver1; 1University of Alabama
    In this study additive friction stir deposition (AFSD) was used to fabricate a bulk Al0.04CoCrFeNi high entropy alloy deposit from arc cast feed stock. Phase analysis via x-ray diffraction indicated the presence of equilibrium phases after deposition. The grain structure and material mixing were examined using electron backscatter diffraction (EBSD) and energy dispersive spectroscopy (EDS) respectively. Significant grain refinement was observed in the AFS-D deposit in comparison to the feed stock with features indicative of dynamic recrystallization. The refined microstructure resulted in increased microhardness. The results are discussed relative to cast and wrought HEAs having the same or similar composition.

J-24: Temperature Influence on Microstructure and Mechanical Behavior during Deposition of Solid-state Additively Manufactured Aluminum Alloy 7050: James Tew1; Malcolm Williams1; Christopher Williamson1; Ryan Kinser1; Bret Cordle1; James Jordon1; Paul Allison1; 1The University of Alabama
    In this study, Additive Friction Stir Deposition (AFSD), a thermo-mechanical solid-state additive manufacturing process, is employed to repair AA7050 plates with a simulated damage-groove and the results of the following parametric study are discussed. Initially, a range of parameters in a 3x3 matrix of process variables including tool rotation, actuator federate, and traverse velocity were tested with a constant damage-groove geometry. Throughout this process, thermal data was recorded using temperature sensing equipment including a pyrometer, thermocouple, and thermal camera, which determined the impact of heat input to the deposition process. Process parameter sets with macro-structural defects like galling and excess flash will be contrasted by successful repairs that display a fully bonded and mechanically strong microstructure with hardness plots describing the strength of the various repair zones. Finally, alternate groove geometries were tested to prove the robust nature of the AFSD repair process for use in various military applications.