Tuning the mechanical and high temperature tribological properties of Co-Cr-Ni medium-entropy alloys via controlling compositional heterogeneity

被引：2
作者：
Geng Y. [1 ,2 ]
Cheng J. [1 ]
Tan H. [1 ]
Zhu S. [1 ]
Yang J. [1 ,2 ]
Liu W. [1 ]
机构：
[1] State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou
[2] Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing
来源：
Journal of Alloys and Compounds | 2021年 / 877卷
基金：
中国国家自然科学基金;
关键词：
High temperature; Material structure; Mechanical properties; Medium-entropy alloy; Tribo-chemistry;
D O I：
10.1016/j.jallcom.2021.160326
中图分类号：
学科分类号：
摘要：
CoCrNi medium-entropy alloys (MEAs) system has been hailed as the potential high strength and ductile structural materials. However, the study on their tribological behaviors over a wide temperature range is still scarce. The current work investigates the effects of heterogeneous (Al, Ti) on the phase evolution, mechanical and high-temperature tribological performances of the MEAs. (Al, Ti) endows the MEAs a considerable solutal effect, which triggers the transformation from FCC-dominated single-phase structure to dual heterostructure containing FCC matrix and yarn-like structures/coupled BCC phases. Our designed MEA has an ultrahigh compressive yield strength of 2.0 GPa and a plasticity of 12.3%. Tribological properties of the designed MEA are temperature dependent. (Al, Ti) enhances the wear-resistance of MEA by five times due to the mitigation of abrasive wear below 400 °C. While between 400 °C and 600 °C, (Al, Ti) intensifies the adhesive wear instead, leading to severe wear. When it reaches 800 °C, (Al, Ti) will induce the tribo-chemistry to form the lubricative glaze-layer that minimizes wear. © 2021 Elsevier B.V.
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