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Investigation of the Dynamic Grain Structure Evolution

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Investigation of the Dynamic Grain Structure Evolution during
Hot Extrusion of EN AW–6082

Ahmet Güzel, Andreas Jäger, Nooman Ben Khalifa, A. Erman Tekkaya
Institute of Forming Technology and Lightweight Construction,
TU Dortmund University, Baroper Str. 301, D-44227 Dortmund, Germany

Track: EXTRUSION/DIE THEORETICAL - Modeling, Microstructure and Simulation

ABSTRACT—Experimental determination of grain structure evolution in an Al-Mg-Si alloy (EN
AW–6082) during hot forward extrusion is investigated. In order to observe the development of
grains and their orientation under severe plastic deformation at elevated temperatures, a miniature
forward extrusion setup was designed. The extrusion butt was quenched immediately after
extrusion to avoid secondary recrystallization effects like static recrystallization and grain growth,
thereby preserving the evolution of grain structure during deformation. The material flow within
the extruded billet was determined by finite element simulations. Microscopic analysis over the
material flow lines and finite element analyses allowed the observation and prediction of the
dynamic evolution of grains at an arbitrary material point undergoing plastic deformation. The
results provide a database for the development material models for predicting and simulating the
evolution of microstructure during the hot deformation of EN AW-6082 alloy.

© Extrusion Technology for Aluminum Profiles Foundation (ET Foundation). All rights reserved. No part of The Proceedings may be reproduced in any form without the express written permission of the ET Foundation.