Journal of Materials Science

, Volume 43, Issue 23–24, pp 7273–7279 | Cite as

Orientation splitting and its contribution to grain refinement during equal channel angular extrusion

Ultrafine-Grained Materials


The early stage mechanisms of grain refinement during ECAE of a single-phase aluminium alloy have been studied using the EBSD technique. It was found that, in addition to the formation of shear-plane cell bands and shear bands by “simple shear”, the development of deformation bands due to orientation splitting contributed significantly to the refinement of microstructure. “Regular” slab-like deformation bands and “irregular” transitional bands were observed after the first pass; both developed boundaries of high misorientations. In the second pass, moderate orientation splitting took place within the deformation bands, although new deformation bands were not detected. With increased strains, fine scale orientation splitting tended to occur in local bands, generating high densities of new high misorientation boundaries. The crystallographic features of the different types of orientation splitting are examined.


Shear Band Simple Shear Deformation Structure Deformation Band Extrusion Direction 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



The authors would like to acknowledge the financial support of the University of Manchester EPSRC Light Alloys Portfolio Partnership (EP/D029201/1) for this project.


  1. 1.
    Segal VM (1995) Mater Sci Eng A 197:157. doi: 10.1016/0921-5093(95)09705-8 CrossRefGoogle Scholar
  2. 2.
    Valiev RZ, Islamgaliev RK, Alexandrov IV (2000) Prog Mater Sci 45:103. doi: 10.1016/S0079-6425(99)00007-9 CrossRefGoogle Scholar
  3. 3.
    Wang J, Iwahashi Y, Horita Z, Furukawa M, Nemoto M, Valiev RZ, Langdon TG (1996) Acta Mater 44:2973. doi: 10.1016/1359-6454(95)00395-9 CrossRefGoogle Scholar
  4. 4.
    Hansen N, Huang X, Hughes DA (2001) Mater Sci Eng A 386:3. doi: 10.1016/S0921-5093(01)01191-1 Google Scholar
  5. 5.
    Zhu YT, Lowe TC (2000) Mater Sci Eng A 291:46. doi: 10.1016/S0921-5093(00)00978-3 CrossRefGoogle Scholar
  6. 6.
    Prangnell PB, Bowen JR, Apps PJ (2004) Mater Sci Eng A 375–377:178. doi: 10.1016/j.msea.2003.10.170 Google Scholar
  7. 7.
    Werenskiold JC, Roven HJ (2005) Mater Sci Eng A 410–411:174. doi: 10.1016/j.msea.2005.08.049 Google Scholar
  8. 8.
    Zhilyaev AP, Oh-ishi K, Raab GI, McNelley TR (2006) Mater Sci Eng A 441:245. doi: 10.1016/j.msea.2006.08.029 CrossRefGoogle Scholar
  9. 9.
    Segal VM (1999) Mater Sci Eng A 271:322. doi: 10.1016/S0921-5093(99)00248-8 CrossRefGoogle Scholar
  10. 10.
    Kuhlman-Wilsdorf D (1999) Acta Mater 47:1697. doi: 10.1016/S1359-6454(98)00413-3 CrossRefGoogle Scholar
  11. 11.
    Hurley PJ, Humphreys FJ (2003) Acta Mater 51:1087. doi: 10.1016/S1359-6454(02)00513-X CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.Manchester Materials Science CentreUniversity of ManchesterManchesterUK

Personalised recommendations