In situ study of microstructure and strength of severely predeformed pure Cu in deformation at 573 K

Wolfgang Blum, J. Dvořák, P. Král, M. Petrenec, P. Eisenlohr, V. Sklenička

Research output: Contribution to journalArticle

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Abstract

The influence of grain refinement on the strength of pure Cu at the elevated temperature of 573 K was studied in situ in a SEM. Thermomechanical processing by eight passes of equal channel angular pressing at ambient temperature and annealing at test temperature generates grains of size. During deformation in the SEM at a relative elongation rate of further grain coarsening occurs by discontinuous recrystallization in subsequent waves causing oscillations of flow stress. Cracks start to form at the boundaries, but partly become intragranular when boundaries move away. The relaxation of flow stress in the periods where the imposed elongation was interrupted yields information about the deformation kinetics. Two mechanisms are identified. One is thermally activated glide related with defect generation. The second one accompanies the processes of microstructure restoration. Under the present deformation conditions, the grain coarsening by DRX does not soften the material but leads to slight hardening as high-Angle boundaries are exchanged for low-Angle boundaries. This is discussed in terms of boundary-mediated processes.

LanguageEnglish (US)
Pages3696-3711
Number of pages16
JournalPhilosophical Magazine
Volume95
Issue number33
DOIs
StatePublished - Nov 22 2015

Profile

microstructure
elongation
scanning electron microscopy
pressing
hardening
restoration
ambient temperature
cracks
oscillations
annealing
temperature
defects
kinetics

Keywords

  • dynamic recovery
  • dynamic recrystallization
  • ECAP
  • grains
  • in situ observation
  • static recrystallization
  • strength
  • stress relaxation

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

In situ study of microstructure and strength of severely predeformed pure Cu in deformation at 573 K. / Blum, Wolfgang; Dvořák, J.; Král, P.; Petrenec, M.; Eisenlohr, P.; Sklenička, V.

In: Philosophical Magazine, Vol. 95, No. 33, 22.11.2015, p. 3696-3711.

Research output: Contribution to journalArticle

Blum W, Dvořák J, Král P, Petrenec M, Eisenlohr P, Sklenička V. In situ study of microstructure and strength of severely predeformed pure Cu in deformation at 573 K. Philosophical Magazine. 2015 Nov 22;95(33):3696-3711. Available from, DOI: 10.1080/14786435.2015.1096025
Blum, Wolfgang ; Dvořák, J. ; Král, P. ; Petrenec, M. ; Eisenlohr, P. ; Sklenička, V./ In situ study of microstructure and strength of severely predeformed pure Cu in deformation at 573 K. In: Philosophical Magazine. 2015 ; Vol. 95, No. 33. pp. 3696-3711
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