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Thermomechanical processing of AA6061 billets for semi-solid forming

  • Yucel Birol
Published/Copyright: May 23, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 98 Issue 1

Abstract

Extruded bars of AA6061 alloy were heat treated above the solidus temperature to produce wrought aluminium feedstock for thixoforming. The extruded material recrystallized during heating to the semi-solid state, producing nearly equiaxed polygonal grains with high-angle boundaries. Melting started at triple junctions during subsequent isothermal heating and progressed along grain boundaries. The low melting point eutectic phase and the high-angle grain boundaries introduced by recrystallization both promoted the grain boundary melting process. The desired feedstock characteristics, comprising complete grain boundary wetting, a perfectly cylindrical slug shape and an average grain size below 100 microns were obtained after 5 min at 640 °C and 635 °C for extrusion ratios of 14: 1 and 5: 1, respectively.

Keywords: Semi-solid forming; Thermomechanical processing; Aluminium alloys
* Correspondence address, Dr. Yücel Birol, Materials Institute, Marmara Research Center, TUBITAK, Gebze, Kocaeli 41470, Turkey, Tel.: +90 262 641 23 00, Fax: +90 262 641 23 09, E-mail:

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Received: 2006-5-9
Accepted: 2006-11-10
Published Online: 2013-05-23
Published in Print: 2007-01-01

© 2007, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.101437
Keywords for this article
Semi-solid forming; Thermomechanical processing; Aluminium alloys

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Editorial
  5. Basic
  6. Synthesis and oxidation of Zr3Al3C5 powders
  7. Standard Gibbs energy of formation of Zn17Y2 and Zn12Y determined by solution calorimetry and measurement of heat capacity from near zero Kelvin
  8. Phase equilibria in the Zn–Fe–S system at 450°C
  9. Formation of δ-Al2O3 hollow nanoparticles via a chemical vapor condensation process
  10. Low-cycle fatigue and damage of an uncoated and coated single crystal nickel-base superalloy SCB
  11. Fluidity of Mg–Al–Ca alloys in the high-pressure die casting process
  12. Applied
  13. Mechanical properties of rope-reinforced aluminium extrusions under quasistatic loading conditions
  14. Influence of interfaces on the mechanical properties of ultrahigh carbon steel multilayer laminates
  15. Thermomechanical processing of AA6061 billets for semi-solid forming
  16. Infrared spectroscopy and X-ray diffraction data of In – Se compounds
  17. Synthesis and characterization of MgAlON–BN composites
  18. Neutron diffraction residual stress analysis of steel engineering components: a study of the elastic and plastic anisotropy
  19. Notifications
  20. DGM News
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