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  • Dynamic Behavior Characteri...
    Williams, M. B.; Cahalan, L. P.; Lopez, J. J.; Perez-Andrade, L. I.; Leonard, R. T.; McDonnell, M. M.; Kelly, M. R.; Lalonde, A. D.; Brewer, L. N.; Jordon, J. B.; Allison, P. G.

    JOM (1989), 11/2023, Letnik: 75, Številka: 11
    Journal Article

    In this research, we study the feasibility of using the solid-state additive manufacturing process, additive friction stir deposition (AFSD), as a suitable technology for creating bulk structural components using aluminum alloy 7020. Using a set of the acceptable processing conditions, a fully dense 92-mm-tall build was successful created. Microstructural characterization of the as-deposited AA7020 revealed a highly refined and equiaxed grain structure compared to the AA7020-T651 feedstock material. Tensile specimens were extracted from the as-deposited component in longitudinal direction to evaluate strain-rate dependance and fatigue behavior. In the quasi-static regime (0.001 s −1 ), the as-deposited AA7020 exhibited layer dependence throughout the build direction indicated by a diminished YS and UTS when comparing the final, intermediate, and initial layers of the deposit and the feedstock material. The layer dependence noted in the quasi-static regime is attributed to the increasing thermal input in the build direction during AFSD process. However, in the high-rate regime (2000 s −1 ), the as-deposited material had a similar flow stress to the feedstock material. Additionally, stress-life experiments determined a decrease in fatigue life between the final, intermediate, and initial layers of the deposit due to the inconsistent MgZn-rich particle coarsening inherent to the AFSD process.