9:20 AM - 9:40 AM
[16B-T6-28] Influences of Different Additives on Laser-Based Additive Manufacturing of Pure Aluminum
Keywords:Laser powder bed fusion; Different additives; Aluminum; Laser-based additive manufacturability
Al powders with low laser absorptivity are essentially incompatible with laser powder bed fusion. The influences of different additives on Al laser-based additive manufacturing were investigated. Nano-CuO particles or GO sheets were coated onto the pure Al powders without apparent agglomeration via the hetero-agglomeration process. Apart from retaining a similar shape and particle size to the initial pure Al powders, the decorated Al powders showed an improved laser absorptivity and flowability, contributing to satisfactory fusion under laser irradiation. Moreover, the mechanical performance of the Al build was enhanced by the addition of these additives, which is mainly caused by the lower porosity, solid-solution strengthening, and the precipitation-dispersion strengthening. This study will benefit the effective selection of reinforcing materials for Al alloy L-PBF builds.