Materials Map

Discover the materials research landscape. Find experts, partners, networks.

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The Materials Map is an open tool for improving networking and interdisciplinary exchange within materials research. It enables cross-database search for cooperation and network partners and discovering of the research landscape.

The dashboard provides detailed information about the selected scientist, e.g. publications. The dashboard can be filtered and shows the relationship to co-authors in different diagrams. In addition, a link is provided to find contact information.

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The Materials Map is still under development. In its current state, it is only based on one single data source and, thus, incomplete and contains duplicates. We are working on incorporating new open data sources like ORCID to improve the quality and the timeliness of our data. We will update Materials Map as soon as possible and kindly ask for your patience.

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in Cooperation with on an Cooperation-Score of 37%

Topics

Publications (1/1 displayed)

  • 2018Microstructure and nanohardness of Ag and Ni under friction in boundary lubrication14citations

Places of action

Chart of shared publication
Cohen, Sidney
1 / 29 shared
Popov, Inna
1 / 2 shared
Moshkovich, Alexey
1 / 4 shared
Vakahy, Atzmon
1 / 1 shared
Rapoport, Lev
1 / 8 shared
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2018

Co-Authors (by relevance)

  • Cohen, Sidney
  • Popov, Inna
  • Moshkovich, Alexey
  • Vakahy, Atzmon
  • Rapoport, Lev
OrganizationsLocationPeople

article

Microstructure and nanohardness of Ag and Ni under friction in boundary lubrication

  • Cohen, Sidney
  • Popov, Inna
  • Moshkovich, Alexey
  • Vakahy, Atzmon
  • Perfilyev, Vladislav
  • Rapoport, Lev
Abstract

<p>Microstructure Grains Dislocations Friction Wear Lubrication.</p><p>Evolution of deformation microstructure and nanohardness of Ag and Ni after friction in the BL regime was studied. All friction tests were conducted under lubricated conditions using a pin-on-disk rig. Pure fee metals such as Ag and Ni, with different SFE (16 and 125 mJm(-2), respectively), were chosen as pin materials. Cross sectional transmission electron microscopy (TEM) lamellae were prepared from the pins using a focused ion beam (FIB). Using TEM, we analysed the regions of the pins that are in steady state after friction; the friction coefficient (mu) and hardness (H-s) remained unchanged with deformation in the BL regime. After the wear tests, the specimens were cross-sectioned in longitudinal and transverse directions (parallel and perpendicular to the direction of friction). Nanoindentations were performed using a Berkovich diamond tip. A gradient of grain sizes during the friction of Ag and Ni in BL regime was revealed by TEM imaging. Deformation twinning followed by limited recovery within the surface of Ag led to the formation of a relatively thick top layer of ultra-fine equiaxial grains. Thermally activated processes for the rearrangement and annihilation of dislocations are accelerated during the friction of Ni due to high SFE and contact temperature. Cross-sectional microstructures observed normal and parallel to the direction of friction are dissimilar. Steady state values of grain size, d(s), and hardness, H-s, after friction in lubricated conditions are explained by the balance between hardening and dynamic recovery in surface layers, and they strongly depend on the SFE and temperature. A correlation between the wear properties (wear coefficient) and total work of deformation during nanoindentation shows a similarity in the nano- and microscales in lubricated friction.</p>

Topics
  • surface
  • grain
  • grain size
  • wear test
  • hardness
  • nanoindentation
  • focused ion beam
  • transmission electron microscopy
  • dislocation
  • lamellae
  • supercritical fluid extraction