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http://dx.doi.org/10.4150/KPMI.2022.29.1.34

Preparation and Refinement Behavior of (Hf-Ti-Ta-Zr-Nb)C High-Entropy Carbide Powders by Ultra High Energy Ball Milling Process  

Song, Junwoo (Research Institute of Advanced Manufacturing & Materials Technology, Korea Institute of Industrial Technology (KITECH))
Han, Junhee (Research Institute of Advanced Manufacturing & Materials Technology, Korea Institute of Industrial Technology (KITECH))
Kim, Song-Yi (Research Institute of Advanced Manufacturing & Materials Technology, Korea Institute of Industrial Technology (KITECH))
Seok, Jinwoo (Research Institute of Advanced Manufacturing & Materials Technology, Korea Institute of Industrial Technology (KITECH))
Kim, Hyoseop (Research Institute of Advanced Manufacturing & Materials Technology, Korea Institute of Industrial Technology (KITECH))
Publication Information
Journal of Powder Materials / v.29, no.1, 2022 , pp. 34-40 More about this Journal
Abstract
Recently, high-entropy carbides have attracted considerable attention owing to their excellent physical and chemical properties such as high hardness, fracture toughness, and conductivity. However, as an emerging class of novel materials, the synthesis methods, performance, and applications of high-entropy carbides have ample scope for further development. In this study, equiatomic (Hf-Ti-Ta-Zr-Nb)C high-entropy carbide powders have been prepared by an ultrahigh-energy ball-milling (UHEBM) process with different milling times (1, 5, 15, 30, and 60 min). Further, their refinement behavior and high-entropy synthesis potential have been investigated. With an increase in the milling time, the particle size rapidly reduces (under sub-micrometer size) and homogeneous mixing of the prepared powder is observed. The distortions in the crystal lattice, which occur as a result of the refinement process and the multicomponent effect, are found to improve the sintering, thereby notably enhancing the formation of a single-phase solid solution (high-entropy). Herein, we present a procedure for the bulk synthesis of highly pure, dense, and uniform FCC single-phase (Fm3m crystal structure) (Hf-Ti-Ta-Zr-Nb)C high-entropy carbide using a milling time of 60 min and a sintering temperature of 1,600℃.
Keywords
High-Entropy Carbide; Ultra High Energy Ball Milling; Refinement Behavior; Microstructure; Single Phase;
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