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Effect of cold rolling on microstructure and mechanical properties of copper subjected to ECAP with various numbers of passes

Authors
Journal
Materials Science and Engineering A
0921-5093
Publisher
Elsevier
Publication Date
Volume
554
Identifiers
DOI: 10.1016/j.msea.2012.06.022
Keywords
  • Copper
  • Ecap
  • Cold Rolling
  • Microstructure Refinement
  • Dynamic Restoration
  • Mechanical Properties
Disciplines
  • Mathematics

Abstract

Abstract Microstructure and mechanical properties of copper subjected to 1–10 ECAP passes via route Bc were compared with those for further cold rolled specimens. Microstructure was studied by means of TEM and EBSD analysis in three orthogonal sections. Rolling caused transformation of reasonably equiaxed structure after ECAP into lamellar one due to geometrical effect of deformation, but almost no additional grain refinement occurred during rolling. Significantly higher extent of HABs (about 20% irrespectively to passes number) was found after rolling. This was associated with more pronounced dynamic restoration process during rolling. Mechanical properties were estimated by tension testing at room temperature. Yield strength increased by ∼100MPa after rolling due to finer boundary spacing according to Hall–Petch relationship.

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