Effect of the carbon content on the morphology evolution of the η phase in cemented carbides with the CoNiFeCr high entropy alloy binder

材料科学 合金 碳化物 硬质合金 冶金 形态学(生物学) 高熵合金 复合材料 遗传学 生物
作者
Cheng Qian,Yong Liu,Huichao Cheng,Kun Li,Bin Liu
出处
期刊:International Journal of Refractory Metals & Hard Materials [Elsevier BV]
卷期号:102: 105731-105731 被引量:3
标识
DOI:10.1016/j.ijrmhm.2021.105731
摘要

For studying the evolution of the η phase in cemented carbides with the CoNiFeCr high entropy alloy binder, we prepared low-carbon, medium-carbon, and high-carbon cemented carbides with a 0.2 wt% difference in the C content using SHIP. The results showed that the η phase morphology was sensitive to the carbon content. When the carbon content was 4.5%, the η phase was abundant and uniformly dispersed. When the carbon content increased to 4.7%, the η phase amount decreased and became locally aggregated in large clusters, showing typical segregation. When the carbon content was further increased to 4.9%, the η phase disappeared. The η phase clusters exhibited a sharp contrast between inner and outer parts. The inner part showed the presence of the η phase, WC with small and round grains, and a small amount of binder. The outer part had only WC with large grain and sharp grains, and a large amount of binder. In addition to the inherent η phase brittleness, the η phase segregation resulted in a large hardness dispersion and a further toughness decrease. • Cemented carbides with the CoNiFeCr MEAs binder with different carbon contents were prepared by SHIP to study the η phase evolution. • The η phase morphology is sensitive to the carbon content. As the carbon content increases, the η phase evolves from dispersed particles to large clusters. • In addition to the inherent brittleness of the η phase, the η phase segregation will cause a large dispersion of hardness and a further decrease in toughness.
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