Effect of electric-current pulses on grain-structure evolution in cryogenically rolled copper

Tatyana Konkova, Irshat Valeev, Sergey Mironov, Alexander Korznikov, Michail Myshlyaev, S. Lee Semiatin

Research output: Contribution to journalArticle

8 Citations (Scopus)
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Abstract

The effect of electric-current pulses on the evolution of microstructure and texture in cryogenically rolled copper was determined. The pulsed material was found to be completely recrystallized, and the recrystallization mechanism was deduced to be similar to that operating during conventional static annealing. The microstructural changes were explained simply in terms of Joule heating. A significant portion of the recrystallization process was concluded to have occurred after pulsing; i.e., during cooling to ambient temperature. The grain structure and microhardness were shown to vary noticeably in the heat-affected zone (HAZ); these observations mirrored variations of temper colors. Accordingly, the revealed microstructure heterogeneity was attributed to the inhomogeneous temperature distribution developed during pulsing. In the central part of the HAZ, the mean grain size increased with current density and this effect was associated with the temperature rise per se. This grain size was slightly smaller than that in statically recrystallized specimens.

Original languageEnglish
Pages (from-to)2727-2737
Number of pages11
JournalJournal of Materials Research
Volume29
Issue number22
Early online date3 Nov 2014
DOIs
Publication statusPublished - 28 Nov 2014

Keywords

  • Cu
  • microstructure
  • texture
  • electric-current pulses
  • cryogenically rolled copper
  • recrystallization
  • grain structure
  • microhardness
  • heat-affected zone

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