Continuous dynamic recrystallization during hot torsion of an aluminum alloy.

M. C. Poletti, T. Simonet-Fotso, D. Halici, D. Canelo-Yubero, F. Montheillet, D. Piot, Z. Kovács, N. Schell, D. Tolnai

Publikation: Beitrag in einer Fachzeitschrift!!Conference articleForschungBegutachtung

Abstract

Most commercial aluminum alloys are characterized by dynamic recrystallization at very large deformations in a continuous manner. The present study deals with the characterization and modeling of the evolution of the microstructure of an aluminum wrought alloy at large plastic deformations. Hot torsion tests of the AA6082 aluminum alloy are carried out using the thermomechanical simulator Gleeble®3800 in a wide range of temperatures and strain rates. The use of water quenching immediately after deformation avoids any static restoration during cooling. Microstructural investigations are carried out by means of electron back scattered diffraction using a scanning electron microscope to determine the grain and subgrain structures, as well as the misorientation distributions. In-situ synchrotron radiation tests during hot torsion are used to confirm the continuous dynamic recrystallization (CDRX) by the evidence of the conversion of low angle boundaries (LAGBs) into high-angle boundaries (HAGBs) and the formation of new texture. Experimental investigations show that CDRX starts with the formation of LAGBs at low strains (center of the sample). By subsequent straining (close to the surface of the sample), the accumulation of dislocations at the LAGBs causes an increase in their misorientation until a critical value is reached and LAGBs transforms into HAGBs. The developed model consists of a microstructural model, equation rates and constitutive equations. The microstructure is described by three internal variables. Their rates are evaluated using the Kocks-Mecking model. The modelled and experimental flow stresses show softening due to the consumption of dislocations and the continuous formation of new HAGBs.

Originalspracheenglisch
Aufsatznummer012049
FachzeitschriftJournal of Physics: Conference Series
Jahrgang1270
Ausgabenummer1
DOIs
PublikationsstatusVeröffentlicht - 14 Aug 2019
Veranstaltung7th International Conference on Recrystallization and Grain Growth, ReX and GG 2019 - Ghent, Belgien
Dauer: 4 Aug 20199 Aug 2019

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aluminum alloys
torsion
misalignment
wrought alloys
microstructure
constitutive equations
restoration
softening
simulators
plastic deformation
strain rate
synchrotron radiation
textures
electron microscopes
quenching
cooling
scanning
causes
diffraction
water

ASJC Scopus subject areas

  • !!Physics and Astronomy(all)

Fields of Expertise

  • Advanced Materials Science

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Poletti, M. C., Simonet-Fotso, T., Halici, D., Canelo-Yubero, D., Montheillet, F., Piot, D., ... Tolnai, D. (2019). Continuous dynamic recrystallization during hot torsion of an aluminum alloy. Journal of Physics: Conference Series, 1270(1), [012049]. https://doi.org/10.1088/1742-6596/1270/1/012049

Continuous dynamic recrystallization during hot torsion of an aluminum alloy. / Poletti, M. C.; Simonet-Fotso, T.; Halici, D.; Canelo-Yubero, D.; Montheillet, F.; Piot, D.; Kovács, Z.; Schell, N.; Tolnai, D.

in: Journal of Physics: Conference Series, Jahrgang 1270, Nr. 1, 012049, 14.08.2019.

Publikation: Beitrag in einer Fachzeitschrift!!Conference articleForschungBegutachtung

Poletti, MC, Simonet-Fotso, T, Halici, D, Canelo-Yubero, D, Montheillet, F, Piot, D, Kovács, Z, Schell, N & Tolnai, D 2019, 'Continuous dynamic recrystallization during hot torsion of an aluminum alloy.' Journal of Physics: Conference Series, Jg. 1270, Nr. 1, 012049. https://doi.org/10.1088/1742-6596/1270/1/012049
Poletti, M. C. ; Simonet-Fotso, T. ; Halici, D. ; Canelo-Yubero, D. ; Montheillet, F. ; Piot, D. ; Kovács, Z. ; Schell, N. ; Tolnai, D. / Continuous dynamic recrystallization during hot torsion of an aluminum alloy. in: Journal of Physics: Conference Series. 2019 ; Jahrgang 1270, Nr. 1.
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