Characterization of AlCoCrFeNi High Entropy Alloy Gas Atomized Powder

• Published in: Materials research (São Carlos, São Paulo, Brazil) Vol. 25; p. 1
• Main Authors: Bomfim, Pamela Karina dos Santos, Coury, Francisco Gil, Wang, Pei, Gargarella, Piter
• Format: Journal Article
• Language: English
• Published: Sao Carlos Universidade Federal do Sao Carlos, Departamento de Engenharia de Materiais 01.01.2022; ABM, ABC, ABPol; Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
• Subjects: Alloy powders; Alloys; Atomizing; Corrosion resistance; Corrosive wear; Ductility; ENGINEERING, CHEMICAL; Gas atomization; High entropy alloys; Laser beam melting; MATERIALS SCIENCE, MULTIDISCIPLINARY; METALLURGY & METALLURGICAL ENGINEERING; Microstructure; Powder metallurgy; Precipitates; Spherical powders; Wear resistance; High entropy alloys; powder metallurgy; gas atomization
• ISSN: 1516-1439; 1980-5373; 1980-5373
• DOI: 10.1590/1980-5373-MR-2021-0120

AlCoCrFeNi alloys are widely studied due to the combination of high strength in a wide temperature range, good corrosion and wear resistance, but they typically present low ductility. Due to this limited ductility, traditional bulk fabrication processes that involve forming are difficult, and casting processes are also non-ideal due to pronounced segregation and coarse microstructure. Therefore, both the selective laser melting and the powder metallurgy are more promising routes for this alloy, both of these use powder as starting material. This work aimed to produce powder of Al20Co20Cr20Fe20Ni20 alloy by gas atomization and to perform its detailed characterization.The results show that the powder is mainly spherical, which resulted in good flowability. Most of the powder (62%) has a size smaller than 75µm, and microscopy analyses confirmed that a B2 dendritic microstructure was formed, with A2 cuboidal precipitates.