Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Fabrication of Equiatomic CoCrFeMnNi High-Entropy Alloy by Metal Injection Molding Process Using Coarse-Sized Powders

  • Eun Seong Kim (Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH)) ;
  • Jae Man Park (Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH)) ;
  • Ji Sun Lee (Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH)) ;
  • Jungho Choe (Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH)) ;
  • Soung Yeoul Ahn (Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH)) ;
  • Sang Guk Jeong (Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH)) ;
  • Do Won Lee (Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH)) ;
  • Seong Jin Park (Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH)) ;
  • Hyoung Seop Kim (Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH))
  • Received : 2023.01.13
  • Accepted : 2023.02.16
  • Published : 2023.02.28
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Abstract

High-entropy alloys (HEAs) are attracting attention because of their excellent properties and functions; however, they are relatively expensive compared with commercial alloys. Therefore, various efforts have been made to reduce the cost of raw materials. In this study, MIM is attempted using coarse equiatomic CoCrFeMnNi HEA powders. The mixing ratio (powder:binder) for HEA feedstock preparation is explored using torque rheometer. The block-shaped green parts are fabricated through a metal injection molding process using feedstock. The thermal debinding conditions are explored by thermogravimetric analysis, and solvent and thermal debinding are performed. It is densified under various sintering conditions considering the melting point of the HEA. The final product, which contains a small amount of non-FCC phase, is manufactured at a sintering temperature of 1250℃.

Keywords

Acknowledgement

This work was supported by the National Research Foundation (NRF) of the Republic of Korea (2021R1A2C3006662 and 2022R1A5A1030054). Eun Seong Kim is also supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2022R1A6A3A13073830).

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