Effects of temperature and microstructure on the triblogical properties of CoCrFeNiNbx eutectic high entropy alloys

Yuan Yu; Feng He; Zhuhui Qiao; Zhijun Wang; Weimin Liu; Jun Yang

doi:10.1016/j.jallcom.2018.10.138

Effects of temperature and microstructure on the triblogical properties of CoCrFeNiNbx eutectic high entropy alloys

Yuan Yu, Feng He, Zhuhui Qiao, Zhijun Wang, Weimin Liu, Jun Yang

School of Materials Sience and Engineering

Research output: Contribution to journal › Article › peer-review

187 Scopus citations

Abstract

This paper is aimed to evaluate the high temperature tribological behaviors of CoCrFeNiNbx eutectic high entropy alloys which would be highly-promising candidates for high-temperature applications. The effects of testing temperature and material structure on the friction and wear properties are investigated. The CoCrFeNiNbx alloys display a low harness decrement rate about 35% from room temperature to 1000 °C, indicating good softening resistance. The main wear mechanisms are abrasion wear at room temperature, change to adhesion wear at 400 °C, and translate into oxidation wear and mechanical wear over 600 °C. The wear rates increase from room temperature to 400 °C and decrease afterwards. The effects of material structure are dominated by the hardness of alloy, the content of chemically active Nb element and the structure of oxidized tribo-layer. The compact oxidized tribo-layers with excellent anti-wear properties are formed on the worn surface of CoCrFeNiNb_0.65 and CoCrFeNiNb_0.8 alloys at 800 °C, leading to extremely low wear rate.

Original language	English
Pages (from-to)	1376-1385
Number of pages	10
Journal	Journal of Alloys and Compounds
Volume	775
DOIs	https://doi.org/10.1016/j.jallcom.2018.10.138
State	Published - 15 Feb 2019

Keywords

Eutectic high entropy alloy
High temperature
Material structure
Tribological properties
Wear mechanism

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10.1016/j.jallcom.2018.10.138

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title = "Effects of temperature and microstructure on the triblogical properties of CoCrFeNiNbx eutectic high entropy alloys",

abstract = "This paper is aimed to evaluate the high temperature tribological behaviors of CoCrFeNiNbx eutectic high entropy alloys which would be highly-promising candidates for high-temperature applications. The effects of testing temperature and material structure on the friction and wear properties are investigated. The CoCrFeNiNbx alloys display a low harness decrement rate about 35% from room temperature to 1000 °C, indicating good softening resistance. The main wear mechanisms are abrasion wear at room temperature, change to adhesion wear at 400 °C, and translate into oxidation wear and mechanical wear over 600 °C. The wear rates increase from room temperature to 400 °C and decrease afterwards. The effects of material structure are dominated by the hardness of alloy, the content of chemically active Nb element and the structure of oxidized tribo-layer. The compact oxidized tribo-layers with excellent anti-wear properties are formed on the worn surface of CoCrFeNiNb0.65 and CoCrFeNiNb0.8 alloys at 800 °C, leading to extremely low wear rate.",

keywords = "Eutectic high entropy alloy, High temperature, Material structure, Tribological properties, Wear mechanism",

author = "Yuan Yu and Feng He and Zhuhui Qiao and Zhijun Wang and Weimin Liu and Jun Yang",

note = "Publisher Copyright: {\textcopyright} 2018 Elsevier B.V.",

year = "2019",

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day = "15",

doi = "10.1016/j.jallcom.2018.10.138",

language = "英语",

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T1 - Effects of temperature and microstructure on the triblogical properties of CoCrFeNiNbx eutectic high entropy alloys

AU - Yu, Yuan

AU - He, Feng

AU - Qiao, Zhuhui

AU - Wang, Zhijun

AU - Liu, Weimin

AU - Yang, Jun

PY - 2019/2/15

Y1 - 2019/2/15

N2 - This paper is aimed to evaluate the high temperature tribological behaviors of CoCrFeNiNbx eutectic high entropy alloys which would be highly-promising candidates for high-temperature applications. The effects of testing temperature and material structure on the friction and wear properties are investigated. The CoCrFeNiNbx alloys display a low harness decrement rate about 35% from room temperature to 1000 °C, indicating good softening resistance. The main wear mechanisms are abrasion wear at room temperature, change to adhesion wear at 400 °C, and translate into oxidation wear and mechanical wear over 600 °C. The wear rates increase from room temperature to 400 °C and decrease afterwards. The effects of material structure are dominated by the hardness of alloy, the content of chemically active Nb element and the structure of oxidized tribo-layer. The compact oxidized tribo-layers with excellent anti-wear properties are formed on the worn surface of CoCrFeNiNb0.65 and CoCrFeNiNb0.8 alloys at 800 °C, leading to extremely low wear rate.

AB - This paper is aimed to evaluate the high temperature tribological behaviors of CoCrFeNiNbx eutectic high entropy alloys which would be highly-promising candidates for high-temperature applications. The effects of testing temperature and material structure on the friction and wear properties are investigated. The CoCrFeNiNbx alloys display a low harness decrement rate about 35% from room temperature to 1000 °C, indicating good softening resistance. The main wear mechanisms are abrasion wear at room temperature, change to adhesion wear at 400 °C, and translate into oxidation wear and mechanical wear over 600 °C. The wear rates increase from room temperature to 400 °C and decrease afterwards. The effects of material structure are dominated by the hardness of alloy, the content of chemically active Nb element and the structure of oxidized tribo-layer. The compact oxidized tribo-layers with excellent anti-wear properties are formed on the worn surface of CoCrFeNiNb0.65 and CoCrFeNiNb0.8 alloys at 800 °C, leading to extremely low wear rate.

KW - Eutectic high entropy alloy

KW - High temperature

KW - Material structure

KW - Tribological properties

KW - Wear mechanism

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DO - 10.1016/j.jallcom.2018.10.138

M3 - 文章

AN - SCOPUS:85055753572

SN - 0925-8388

VL - 775

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EP - 1385

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

ER -

Effects of temperature and microstructure on the triblogical properties of CoCrFeNiNbx eutectic high entropy alloys

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Keywords

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