Al-Mg-Si Aluminum alloys are extensively used in the production of simple and complex long sections by means of extrusion process. The demand of quality in the extruded profile is today increased both in term of mechanical characteristics and surface appearance; in particular, the final microstructure plays a critical role for both aspects. Static and dynamic recrystallization, precipitation of non metallic particles and grain growth are phenomena that strongly affect both profile strength-deformability and aesthetical defects such as streaks and PFZ (Precipitate Free Zones). In particular, dynamic recrystallization plays an important role in determining the quality of the final product. In this work an inverse extrusion test has been performed on AA6060 and AA6082 alloys at different temperatures and with different strain rates. The deformation sequence has been simulated by means of thermo-mechanical FEM simulations, where a model for grain size prediction has been implemented. In each extruded product the grain size in the different zones has been measured and compared with the simulations results.

INFLUENCE OF MICROSTRUCTURE ON EXTRUDED SURFACE QUALITY

DONATI, LORENZO;TOMESANI, LUCA
2007

Abstract

Al-Mg-Si Aluminum alloys are extensively used in the production of simple and complex long sections by means of extrusion process. The demand of quality in the extruded profile is today increased both in term of mechanical characteristics and surface appearance; in particular, the final microstructure plays a critical role for both aspects. Static and dynamic recrystallization, precipitation of non metallic particles and grain growth are phenomena that strongly affect both profile strength-deformability and aesthetical defects such as streaks and PFZ (Precipitate Free Zones). In particular, dynamic recrystallization plays an important role in determining the quality of the final product. In this work an inverse extrusion test has been performed on AA6060 and AA6082 alloys at different temperatures and with different strain rates. The deformation sequence has been simulated by means of thermo-mechanical FEM simulations, where a model for grain size prediction has been implemented. In each extruded product the grain size in the different zones has been measured and compared with the simulations results.
2007
Proceedings of Aluminium Twothousand Congress
33
33
L. Donati; L. Tomesani
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/46266
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