Effect of plasticity on nanoscale wear of third-body particles. (March 2021)

• Record Type: Journal Article
• Authors: Hu, Jianqiao; Yuan, Fuping; Liu, Xiaoming; Wei, Yueguang
• Is Part Of: Tribology international. Volume 155(2021)
• Publication Date: 2021-03
• Subjects: Third-body nanoparticle -- Wear mechanism -- Dislocation plasticity -- Brittle-to-ductile transition; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2020.106739
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: Understanding third-body wear is difficult when the size of the third-body particle reaches nanoscale, because the plasticity produced at the nanoscale exhibits a size effect resulting from the dislocation plasticity in a finite volume. Through molecular dynamics simulations, we observed that dislocation plasticity induces two failure patterns of the third-body wear: brittle failure due to highly localized deformation in mildly compressive particles and ductile failure due to exfoliation-like deformation in severely compressed particles. During the wear process, the deformation of third-body particle shows better ductility as the particle size increases. Due to the highest dislocation plasticity, the wear volume reaches the maximum at the critical compressive strain of ~13%. In addition, a size-independent wear rate is observed for the third-body wear. Highlights: Dislocation plasticity induces two failure patterns of third-body wear. The deformation of third-body particle shows better ductility by increasing particle size. The third-body wear shows a size-independent wear rate for particles with radius ranging from 4 nm to 12.5 nm.