Novel insight into the self-lubricating mechanism of Cu-Pb bearing alloy during sliding friction with the guidance of molecular dynamics

作者：Wu, Zhenpeng; Dong, Bowen^*; Peng, Gaoyu; Luo, Wenyan; Shan, Xingrun; Nie, Liangyi; Chen, Juan; Zeng, Liangcai; Jie, Jinchuan; Li, Tingju

来源：Journal of Materials Research and Technology-JMR&T, 2023, 24: 3157-3163.

DOI：10.1016/j.jmrt.2023.03.163

• Self-lubricating
• Cu-Pb bearing alloy
• Molecular dynamics
• Phase transition

The self-lubricating mechanism of Cu-Pb bearing alloy is discussed by molecular dynamics (MD). MD friction tests are conducted on the pure Cu and Cu-Pb models. The Pbrich secondary phases (PSPs) melt due to the frictional heat. The solid-liquid phase transition of Pb is characterized by the radial distribution RDF) and the potential energy. An obvious drop of motion resistance of the abrasive debris is observed in Cu-Pb alloy once the debris moves close to the soft PSP which protect the matrix from abrasion by embedding the debris and promoting the formation of a liquid lubricant film. The synchrotron radiation technology is employed to in-situ observe the phase transition of Pb, and the MD results match the experimental results well.& COPY; 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).