Til hovedinnhold

Recrystallization behaviour of AA6063 extrusions

Recrystallization behaviour of AA6063 extrusions

Kategori
Tidsskriftspublikasjon
Sammendrag
Cylindrical profiles of an AA6063 aluminium alloy were produced in a lab-scale direct extrusion set-up. The extrusion was performed at 300 °C, 450 °C and 550 °C, respectively, with the same ram speed. Immediate water quenching was applied to the profiles and the end of billet (butt-end) after extrusion. Microstructure and texture of the material in different states were measured by electron back-scattered diffraction. Only the profile extruded at 300 °C, was found in the deformed state after extrusion, featuring a fibrous grain structure and a strong <111> and weak <100> double fibre texture. Post-extrusion annealing of this profile at 450 °C resulted in an almost fully recrystallized structure (recrystallized fraction of 87%) and with a texture similar to that of the as-deformed state. The profile extruded at 450 °C was almost fully recrystallized (recrystallization fraction 91%) already after quenching, and with a texture characterized by a weak <111> and strong <100> double fibre. The profile extruded at 550 °C showed a partially recrystallized grain structure with recrystallization fraction of 71%, and with a texture dominated by a <100> fibre. The influence of the deformation conditions on the recrystallization behaviour, in terms of recrystallization kinetics and mechanisms, are discussed in view of these results.
Språk
Engelsk
Forfatter(e)
  • Zhang Kai
  • Pettersen Tanja
  • Paulsen Christian Oen
  • Marthinsen Knut
  • Holmedal Bjørn
  • Segatori A
Institusjon(er)
  • Norges teknisk-naturvitenskapelige universitet
  • SINTEF Industri / Metallproduksjon og prosessering
  • Sverige
År
2015
Publisert i
IOP Conference Series: Materials Science and Engineering
ISSN
1757-8981
Forlag
Institute of Physics Publishing Ltd.
Årgang
89
Hefte nr.
1