Abstract: Recently, more and more researchers pay attention on the research of high entropy alloys (HEAs) of AlxCoCrFeNi system due to their unique composition and excellent performance. When compared with traditional as-cast AlxCoCrFeNi HEAs, the additive manufactured counterparts generally present highly effective production and excellent mechanical properties, promoting their development and application in practice. The latest researches on the additive manufactured AlxCoCrFeNi HEAs, including their preparation of powder, printing process, microstructure and properties, applications and outlooks, are reviewed in this paper. Firstly, the fundamental introduction on the AlxCoCrFeNi HEAs and the common methods of additive manufacture are introduced in detail. Secondly, the pre-alloying powders of AlxCoCrFeNi HEAs and their characteristics are summarized. Thirdly, the printing parameters and the properties of additive manufactured AlxCoCrFeNi HEAs fabricated by the selective laser melting (SLM), directed energy deposition (DED) and laser cladding are discussed to clarify the influence of volume energy density, laser power, scanning velocity and scanning strategies on their properties and the possible defects. Besides, microstructure, mechanical and corrosion properties of additive manufactured AlxCoCrFeNi HEAs are analyzed. Finally, the application prospects of AlxCoCrFeNi HEAs in various fields are summarized, and also the existing problems in current studies, the research emphasis and research direction of research in the future are pointed out.
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