Investigations on the microstructures and tribological behaviors of as-cast CrFeCoNiCux high entropy alloys

作者：Wang, Qiang^*; Hu, Qiang; Wang, Hailing^*; Zeng, Liangcai

来源：Intermetallics, 2023, 157: 107886.

DOI：10.1016/j.intermet.2023.107886

• High entropy alloy
• Cu-containing
• Microstructure
• Tribological properties

In this work, the microstructures and tribological properties of as-cast CrFeCoNiCux (x = 0, 0.5 and 1.0) HEAs were studied in details. Experimental results revealed that the addition of Cu could lead to formation of Cu-rich phase existing in the inter-dendrite region. The friction coefficient of the Cu-free HEA increased with the sliding duration, and a trend of increasing first and then decreasing was acquired in the Cu-containing HEAs. An increase in the sliding duration changed the wear mechanism from micro-cutting to oxidation wear. The results of finite element analysis indicated that a significant tensile stress was generated on the local regions of the worn surface, thus leading to the initiation of cracks and the spalling of the tribo-oxide layer. There were obvious piling-ups along the edge of the wear track as the material flow was obstructed. Moreover, the thickness of the tribo -oxide layer increased quasi-linearly with sliding duration, indicating its forming mechanism of diffusion-controlled. The dislocations generated within the tribologically-deformed subsurface were considered as the high diffusion pathways.

• 单位
  华中科技大学