Abstract
AA3104 alloy was fabricated by laser direct energy deposition (DED) additive manufacturing (AM). The high cooling rate contributed to the formation of AlFe intermetallic particles in the melt pool. The heat-affected region along the melt pool boundary contained coarsened Al6(Mn, Fe) and Mg2Si particles. Eutectoid reaction, particle coarsening, and microstructure homogenization can be achieved by post-AM heat treatment. The thermal conductivity of the build substrate was found to affect microstructure development of AA3104 during DED AM, providing opportunities to control phase transformation and particle distribution in AM AA3104.KeywordsAl-Mn alloysAdditive manufacturingHomogenizationConstituent particles
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