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Title: Morphological features of the copper surface layer under sliding with high density electric current

Conductivity and wear intensity of copper under the influence of dry friction and electric current with contact density higher 100 A/cm{sup 2} are presented. It is shown that an increase in hardness and heat outflow from a friction zone leads to the reduction of wear intensity and current contact density increase corresponding to the beginning of catastrophic wear. Structural changes, such as the formation of FeO oxide and α-Fe particles in the copper surface layer, have also been found. It is observed that a worn surface is deformed according to a viscous liquid mechanism. Such singularity is explained in terms of appearance of high-excited atomic states in deforming micro-volumes near contact spots that lead to easy stress relaxation by local plastic shears in the vicinity of stress concentrators. In common this effect allows to achieve high wear resistance.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [2] ;  [3]
  1. Institute of Strength Physics and Materials Science SB RAS, Tomsk, 634055 (Russian Federation)
  2. (Russian Federation)
  3. National Research St. Petersburg State Polytechnical University, St. Petersburg, 195251 (Russian Federation)
Publication Date:
OSTI Identifier:
22492521
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1683; Journal Issue: 1; Conference: International conference on advanced materials with hierarchical structure for new technologies and reliable structures 2015, Tomsk (Russian Federation), 21-25 Sep 2015; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COPPER; DENSITY; ELECTRIC CURRENTS; FRICTION; HARDNESS; HEAT; IRON OXIDES; IRON-ALPHA; LAYERS; LIQUIDS; MORPHOLOGY; PLASTICITY; SHEAR; SINGULARITY; STRESS RELAXATION; STRESSES; SURFACES; WEAR; WEAR RESISTANCE