Abstract: Recently, additive manufacturing (AM) technology has emerged as a prominent research and application in the manufacturing field due to its efficient near-net-shape forming. Compared with conventional material processing methods, AM, based on the layer-by-layer superposition principle, enables the customized design and preparation of parts with specialized shapes and dimensions along with shorter production cycles and reduced material consumption. Given the extensive application potential of aluminum alloys in aerospace, rail transit, new energy, and other fields, AM technology facilitates the rapid development and application of aluminum alloy components, even in intricate and complex structures. However, there are many issues in additive-manufactured aluminum alloys, such as porosity, cracking, and internal residual stress due to metal melting and rapid solidification during the AM process. These concomitant defects can degrade the mechanical and anti-corrosion properties of the parts. Therefore, advanced AM technologies for aluminum alloys are crucial to overcoming the application bottlenecks by optimizing the structure and properties. This paper reviewed the current state of AM technologies in aluminum alloys, including selective laser melting, wire arc additive manufacturing, friction stir additive manufacturing, and cold spray additive manufacturing. The research status and technological advancements of AM technologies of aluminum alloy are summarized, and the processing-structure-performance relationship in various AM technologies is analyzed. Moreover, this paper provided insight into AM technologies of aluminum alloys, and offered guidance for exploring high-performance aluminum alloys.
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