1. Microstructure and tribological properties of in-situ carbide/CoCrFeNiMn high entropy alloy composites synthesized by flake powder metallurgy.
- Author
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Ye, Wenting, Xie, Mingda, Huang, Zhuobin, Wang, Hanming, Zhou, Qing, Wang, Long, Chen, Biao, Wang, Haifeng, and Liu, Weimin
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POWDER metallurgy , *INTERFACIAL friction , *ENTROPY , *MICROSTRUCTURE , *INTERFACIAL bonding , *MECHANICAL wear - Abstract
CoCrFeNiMn high entropy alloy (HEA) owns prominent strain hardening capacity and high tensile elongation but poor wear resistance. In present work, in-situ carbide/CoCrFeNiMn composites with excellent anti-wear properties were fabricated by a flake powder metallurgy route using graphene oxide (GO) and CoCrFeNiMn as original powders. As a result, the hard carbide phase, Cr 7 C 3 , is formed in the soft matrix via in-situ reaction at the GO/HEA interface, which leads to a dense distribution of small-sized Cr 7 C 3 and strong interfacial bonding of the composites. With the addition of 5 wt% GO, the microhardness is improved by 66.7% and the macroscopic wear rate is decreased by 78.3% as compared with CoCrFeNiMn HEA. Increased nano-scratch resistance indicates that the dense distribution of hard Cr 7 C 3 carbide and the strong Cr 7 C 3 -CoCrFeNiMn interfacial bonding play key roles to resist the plastic flow of the HEA matrix during friction and wear. This study may provide a pathway to improve the wear resistance of HEA for engineering applications. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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