Microstructure and tribological properties of in-situ carbide/CoCrFeNiMn high entropy alloy composites synthesized by flake powder metallurgy. (March 2023)

• Record Type: Journal Article
• Authors: Ye, Wenting; Xie, Mingda; Huang, Zhuobin; Wang, Hanming; Zhou, Qing; Wang, Long; Chen, Biao; Wang, Haifeng; Liu, Weimin
• Is Part Of: Tribology international. Volume 181(2023)
• Publication Date: 2023-03
• Subjects: Tribological behavior -- Carbide -- High entropy alloy -- Graphene oxide; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2023.108295
• Languages: English
• ISSNs: 0301-679X

Abstract

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, Cr7 C3, is formed in the soft matrix via in-situ reaction at the GO/HEA interface, which leads to a dense distribution of small-sized Cr7 C3 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 Cr7 C3 carbide and the strong Cr7 C3 -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.