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Thixoforming of non-dendritic AA6061 feedstock produced by low superheat casting with and without a cooling slope

  • 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 10

Abstract

Low superheat casting with and without a cooling slope was employed to produce AA6061 thixoforming feedstock. The dendritic features were more frequent in the latter, suggesting that the degeneration of the dendritic structure was promoted by the cooling slope casting process. Minor differences in the primary phase morphology in the as-cast state were no longer evident after partial melting, with nearly equiaxed polygonal grains in all ingots cast with and without a cooling slope. 5 min soaking at 640 °C was identified as the best reheating practice as it provided the smallest grains and the most complete grain boundary wetting. The slugs machined from AA6061 ingots cast from a pouring temperature of 680 °C with and without a cooling slope were both successfully thixoformed into sound parts with no signs of porosity and segregation. The T6 heat treatment produced hardness values as high as 107 HB which compare very favourably with those of the extruded products and are even better than that obtained in the thermomechanically processed feedstock.

Keywords: Semi-solid forming; Aluminium alloys
* Correspondence address, Dr. Yücel Birol, Materials Institute, Marmara Research Center, TUBITAK, Gebze, Kocaeli 41470, Turkey, Tel.: +90 262 677 3084, Fax: +90 262 641 2309, E-mail:

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Received: 2007-1-16
Accepted: 2007-6-20
Published Online: 2013-05-23
Published in Print: 2007-10-01

© 2007, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.101560
Keywords for this article
Semi-solid forming; Aluminium alloys

Articles in the same Issue

  1. Contents
  2. Contents
  3. Basic
  4. Modeling short-range ordering in solutions
  5. 3D-representation of phase and property diagrams in multi-component systems
  6. Constrained Gibbs energy minimisation
  7. The thermochemistry library ChemApp and its applications
  8. SimuSage – the component library for rapid process modeling and its applications
  9. An assessment of the ordered phases in Mn–Ni using two- and four-sublattice models
  10. Thermodynamic assessment of the Al–Li system
  11. Detailed phase diagram mapping: T–X data for solidi and liquidi of the alloy system manganese–carbon
  12. Applied
  13. Thermodynamic aspects of liquid phase sintering of SiC using Al2O3 and Y2O3
  14. Thermodynamic modeling of the B2O3–SiO2 and B2O3–Al2O3 systems
  15. Applications of thermodynamic modeling in copper converting operations
  16. Thermodynamic treatment of uranium dioxide based nuclear fuel
  17. Thermodynamic modeling of the stability and melting properties of sodium borates relevant to black liquor combustion and gasification
  18. Thixoforming of non-dendritic AA6061 feedstock produced by low superheat casting with and without a cooling slope
  19. Comparative thermodynamic study and phase equilibria of the Bi–Ga–Sn ternary system
  20. Grain growth in materials with mobile second-phase particles
  21. Notifications
  22. DGM News
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