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Materials 2018, 11(8), 1319; https://doi.org/10.3390/ma11081319

Microstructure Evolution in a 6082 Aluminium Alloy during Thermomechanical Treatment

1
Institute for Materials Science, Joining and Forming, Graz University of Technology, Kopernikusgasse 24, 8010 Graz, Austria
2
Advanced Materials and Mechanical Testing, French-German Research Institute of Saint-Louis, 5 rue du Général Cassagnou, 68300 Saint-Louis, France
3
Institute for Process and Particle Engineering, Graz University of Technology, Inffelddgasse 13/3, 8010 Graz, Austria
4
AMAG Austria Metall AG, Lamprechtshausenerstrasse 61, P.O. Box 3, 5282 Braunau-Ranshofen, Austria
5
Institute of Electron Microscopy and Nanoanalysis of the TU Graz (FELMI), Graz Centre for Electron Microscopy (ZFE Graz), Steyrergasse 17, 8010 Graz, Austria
6
Erich Schmid Institute of Materials Science of the Austrian Academy of Sciences, Jahnstrasse 12, 8700 Leoben, Austria
*
Author to whom correspondence should be addressed.
Received: 31 May 2018 / Revised: 25 July 2018 / Accepted: 26 July 2018 / Published: 30 July 2018
(This article belongs to the Special Issue Thermo-Mechanical Behaviour of Structural Lightweight Alloys)
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Abstract

Thermomechanical treatments of age-hardenable wrought aluminium alloys provoke microstructural changes that involve the movement, arrangement, and annihilation of dislocations, the movement of boundaries, and the formation or dissolution of phases. Cold and hot compression tests are carried out using a Gleeble® 3800 machine to produce flow data as well as deformed samples for metallography. Electron backscattered diffraction and light optical microscopy were used to characterise the microstructure after plastic deformation and heat treatments. Models based on dislocation densities are developed to describe strain hardening, dynamic recovery, and static recrystallisation. The models can describe both the flow and the microstructure evolutions at deformations from room temperatures to 450 °C. The static recrystallisation and static recovery phenomena are modelled as a continuation of the deformation model. The recrystallisation model accounts also for the effect of the intermetallic particles in the movements of boundaries. View Full-Text
Keywords: thermomechanical treatment; aluminium alloy; recovery; recrystallisation; dislocations; materials modelling thermomechanical treatment; aluminium alloy; recovery; recrystallisation; dislocations; materials modelling
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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MDPI and ACS Style

Poletti, C.; Bureau, R.; Loidolt, P.; Simon, P.; Mitsche, S.; Spuller, M. Microstructure Evolution in a 6082 Aluminium Alloy during Thermomechanical Treatment. Materials 2018, 11, 1319.

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