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Microstructure and high temperature deformation of an ultra-fine grained ECAP AA7075 aluminium alloy

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Published/Copyright: May 18, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 104 Issue 1

Abstract

An AA 7075 aluminium alloy with an ultra-fine grained structure was prepared through equal channel angular pressing (ECAP) at pressing temperatures TECAP of 120, 170, and 220 °C. A decrease in TECAP from 220 to 120 °C was found to lead to a more pronounced refinement of the microstructure and to worse stability of the microstructure – the onset of grain coarsening was displaced to lower temperatures. The material pressed with the highest TECAP exhibited superplastic behaviour at temperatures close to 400 °C and grain boundary sliding was identified as the dominant operating deformation mechanism. The materials prepared with both of the lower TECAP exhibited only enhanced ductility of about 200 %, however this behaviour was observed at temperatures as low as 200 °C. It was found that this “low temperature superplasticity” resulted from a combined operation of grain boundary sliding at selected grain boundaries and glide of lattice dislocations.

Keywords: Aluminium alloy; ECAP; Microstructure; Superplasticity; Deformation mechanism
∗ Correspondence address, Assoc. Prof. Dr. Přemysl Málek, Charles University in PragueFaculty of Mathematics and PhysicsDepartment of Physics of Materials, 12116 Praha 2, Ke Karlovu 5Czech Republic, Tel.: 00420 221911363, Fax: 00420 221911490, E-mail:

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Received: 2011-10-26
Accepted: 2012-7-4
Published Online: 2013-05-18
Published in Print: 2013-01-01

© 2013, Carl Hanser Verlag, München

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Microstructure and high temperature deformation of an ultra-fine grained ECAP AA7075 aluminium alloy
  5. Stability of mechanical behavior and work performance in TiNi-based alloys during thermal cycling
  6. The effect of welding process and shielding atmosphere on the AlMg4.5Mn weld metal properties
  7. Comparative thermodynamic analysis and phase diagram prediction of the Ga – Sn – Zn system
  8. 450°C isothermal section of the Zn-Fe-Co-Si quaternary system at the zinc-rich corner
  9. Mixing enthalpies in binary Ce-Sb and ternary Ce-Co-Sb liquid alloys
  10. Thermodynamic re-assessment of the Ni – Sn system
  11. Study of macro- and micro-segregation of iridium in molybdenum single crystals after electron beam zone melting
  12. Microstructure, mechanical and oxidation properties of in-situ synthesized (Y2O3 + TiC)/Ti-4.5Si composites
  13. Hydrothermal synthesis of MoO3 micro-belts
  14. Room temperature synthesis of microemulsion mediated rutile TiO2 nanoparticles showing remarkable photocatalytic activity
  15. Effect of montmorillonite clay content on ac conductivity and impedance of Epoxy-based nanocomposites
  16. Effect of sintering behavior on the porous structure of porous quartz ceramics
  17. Structural, elastic, thermodynamic and lattice dynamic properties of PrX (X = Sb, Bi)
  18. Electronic mobilities of fluorinated oligoacenes
  19. DGM News
  20. Fachausschüsse
https://doi.org/10.3139/146.110833
Keywords for this article
Aluminium alloy; ECAP; Microstructure; Superplasticity; Deformation mechanism

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Microstructure and high temperature deformation of an ultra-fine grained ECAP AA7075 aluminium alloy
  5. Stability of mechanical behavior and work performance in TiNi-based alloys during thermal cycling
  6. The effect of welding process and shielding atmosphere on the AlMg4.5Mn weld metal properties
  7. Comparative thermodynamic analysis and phase diagram prediction of the Ga – Sn – Zn system
  8. 450°C isothermal section of the Zn-Fe-Co-Si quaternary system at the zinc-rich corner
  9. Mixing enthalpies in binary Ce-Sb and ternary Ce-Co-Sb liquid alloys
  10. Thermodynamic re-assessment of the Ni – Sn system
  11. Study of macro- and micro-segregation of iridium in molybdenum single crystals after electron beam zone melting
  12. Microstructure, mechanical and oxidation properties of in-situ synthesized (Y2O3 + TiC)/Ti-4.5Si composites
  13. Hydrothermal synthesis of MoO3 micro-belts
  14. Room temperature synthesis of microemulsion mediated rutile TiO2 nanoparticles showing remarkable photocatalytic activity
  15. Effect of montmorillonite clay content on ac conductivity and impedance of Epoxy-based nanocomposites
  16. Effect of sintering behavior on the porous structure of porous quartz ceramics
  17. Structural, elastic, thermodynamic and lattice dynamic properties of PrX (X = Sb, Bi)
  18. Electronic mobilities of fluorinated oligoacenes
  19. DGM News
  20. Fachausschüsse
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