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

Published online by Cambridge University Press:  03 November 2014

Tatyana Konkova
Affiliation:
Institute for Metals Superplasticity Problems, Russian Academy of Science, Ufa 450001, Russia
Irshat Valeev
Affiliation:
Institute for Metals Superplasticity Problems, Russian Academy of Science, Ufa 450001, Russia
Sergey Mironov*
Affiliation:
Institute for Metals Superplasticity Problems, Russian Academy of Science, Ufa 450001, Russia; and Department of Materials Processing, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
Alexander Korznikov
Affiliation:
Institute for Metals Superplasticity Problems, Russian Academy of Science, Ufa 450001, Russia; and National Research Tomsk State University, Tomsk 634050, Russia
Michail Myshlyaev
Affiliation:
Baikov Institute of Metallurgy and Material Science, Russian Academy of Science, Moscow 119991, Russia; and Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast 142432, Russia
S. Lee Semiatin
Affiliation:
Air Force Research Laboratory, Materials and Manufacturing Directorate, AFRL/RXCM, Wright-Patterson AFB, Ohio 45433-7817, USA
*
a)Address all correspondence to this author. e-mail: smironov@material.tohoku.ac.jp
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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.

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Copyright
Copyright © Materials Research Society 2014 

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References

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