Microstructures, mechanical properties, and grease-lubricated sliding wear behavior of Cu-15Ni-8Sn-0.8Nb alloy with high strength and toughness

Jinjuan CHENG; Mincong MAO; Xueping GAN; Qian LEI; Zhou LI; Kechao ZHOU

doi:10.1007/s40544-020-0399-7

Friction 2021, 9(5): 1061-1076 https://doi.org/10.1007/s40544-020-0399-7

Research Article |

Open Access | Issue | Published: 24 October 2020

Microstructures, mechanical properties, and grease-lubricated sliding wear behavior of Cu-15Ni-8Sn-0.8Nb alloy with high strength and toughness

Show Author's Information Hide Author's Information Jinjuan CHENG^¹, Mincong MAO^¹, Xueping GAN^¹(

), Qian LEI^¹(

), Zhou LI^², Kechao ZHOU^¹

1State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

2School of Materials Science and Engineering, Central South University, Changsha 410083, China

Keywords:

microstructure, mechanical properties, Cu-15Ni-8Sn-0.8Nb alloy, grease-lubricated wear behavior

Cite this article:

CHENG J, MAO M, GAN X, et al. Microstructures, mechanical properties, and grease-lubricated sliding wear behavior of Cu-15Ni-8Sn-0.8Nb alloy with high strength and toughness. Friction, 2021, 9(5): 1061-1076. https://doi.org/10.1007/s40544-020-0399-7

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Abstract

Alloys used as bearings in aircraft landing gear are required to reduce friction and wear as well as improve the load-carrying capability due to the increased aircraft weights. Cu-15Ni-8Sn-0.8Nb alloy is well known for possessing good mechanical and wear properties that satisfy such requirements. In this study, the microstructure, mechanical properties, and grease-lubricated sliding wear behavior of Cu-15Ni-8Sn-0.8Nb alloy with 0.8 wt% Nb are investigated. The nanoscale NbNi₃ and NbNi₂Sn compounds can strengthen the alloy through the Orowan strengthening mechanism. A Stribeck-like curve is plotted to illustrate the relationship among friction coefficient, normal load, and sliding velocity and to analyze the grease-lubricated mechanism. The wear rate increases with normal load and decreases with sliding velocity, except at 2.58 m/s. A wear mechanism map has been developed to exhibit the dominant wear mechanisms under various friction conditions. When the normal load is 700 N and the sliding velocity is 2.58 m/s, a chemical reaction between the lubricating grease and friction pairs occurs, resulting in the failure of lubricating grease and an increase in wear.

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Microstructures, mechanical properties, and grease-lubricated sliding wear behavior of Cu-15Ni-8Sn-0.8Nb alloy with high strength and toughness

Show Author's information Hide Author's Information Jinjuan CHENG^¹, Mincong MAO^¹, Xueping GAN^¹(

), Qian LEI^¹(

), Zhou LI^², Kechao ZHOU^¹

1State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

2School of Materials Science and Engineering, Central South University, Changsha 410083, China

Abstract

Keywords: microstructure, mechanical properties, Cu-15Ni-8Sn-0.8Nb alloy, grease-lubricated wear behavior

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Publication history

Received: 02 January 2020

Revised: 23 April 2020

Accepted: 06 May 2020

Published: 24 October 2020

Issue date: October 2021

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Acknowledgements

The authors would like to express their gratitude for the financial support provided by the National Key Research and Development Program of China (Grant Nos. 2017YFB0306105 and 2018YFE0306100).