Dislocation structure and hardness of surface layers under friction of copper in different lubricant conditions

Louisa Meshi, Shmuel Samuha, Sidney R. Cohen, Alex Laikhtman, Alexey Moshkovich, Vladislav Perfilyev, Igor Lapsker, Lev Rapoport

Research output: Contribution to journalArticlepeer-review

39 Scopus citations


Friction and wear of copper rubbed in the presence of lubricants over a wide range of loads and sliding velocities were studied. The results of friction and wear experiments in the boundary lubrication (BL) and elastohydrodynamic lubrication (EHL) regimes are briefly considered. The structural state of subsurface layers in different lubricant regions is studied by optical, transmission and scanning microscopy analysis. Dislocation density and Burgers vector of individual dislocations in EHL and BL lubricant regimes were determined. A laminated structure with thin and elongated grains is formed in the EHL region. A range of nanocrystalline structures with grain sizes of 20-100 nm is formed in the surface layers in the BL region. Strong plastic deformation (SPD) of thin surface layers under friction is accompanied by formation of shear bands in sublayers of contact spots. Nanohardness at thin surface layers is compared for surfaces rubbed under different lubricant regimes. The hardness of thin surface layers saturates after repeated sliding of Cu and is close to the hardness of nanocrystalline Cu produced by various SPD processes.

Original languageEnglish
Pages (from-to)342-348
Number of pages7
JournalActa Materialia
Issue number1
StatePublished - Jan 2011
Externally publishedYes


  • Copper
  • Friction
  • Microstructure
  • Severe plastic deformation
  • Wear


Dive into the research topics of 'Dislocation structure and hardness of surface layers under friction of copper in different lubricant conditions'. Together they form a unique fingerprint.

Cite this