Abstract
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.
Similar content being viewed by others
References
Segal VM (1995) Mater Sci Eng A 197:157. doi:https://doi.org/10.1016/0921-5093(95)09705-8
Valiev RZ, Islamgaliev RK, Alexandrov IV (2000) Prog Mater Sci 45:103. doi:https://doi.org/10.1016/S0079-6425(99)00007-9
Wang J, Iwahashi Y, Horita Z, Furukawa M, Nemoto M, Valiev RZ, Langdon TG (1996) Acta Mater 44:2973. doi:https://doi.org/10.1016/1359-6454(95)00395-9
Hansen N, Huang X, Hughes DA (2001) Mater Sci Eng A 386:3. doi:https://doi.org/10.1016/S0921-5093(01)01191-1
Zhu YT, Lowe TC (2000) Mater Sci Eng A 291:46. doi:https://doi.org/10.1016/S0921-5093(00)00978-3
Prangnell PB, Bowen JR, Apps PJ (2004) Mater Sci Eng A 375–377:178. doi:https://doi.org/10.1016/j.msea.2003.10.170
Werenskiold JC, Roven HJ (2005) Mater Sci Eng A 410–411:174. doi:https://doi.org/10.1016/j.msea.2005.08.049
Zhilyaev AP, Oh-ishi K, Raab GI, McNelley TR (2006) Mater Sci Eng A 441:245. doi:https://doi.org/10.1016/j.msea.2006.08.029
Segal VM (1999) Mater Sci Eng A 271:322. doi:https://doi.org/10.1016/S0921-5093(99)00248-8
Kuhlman-Wilsdorf D (1999) Acta Mater 47:1697. doi:https://doi.org/10.1016/S1359-6454(98)00413-3
Hurley PJ, Humphreys FJ (2003) Acta Mater 51:1087. doi:https://doi.org/10.1016/S1359-6454(02)00513-X
Acknowledgements
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.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Huang, Y., Prangnell, P.B. Orientation splitting and its contribution to grain refinement during equal channel angular extrusion. J Mater Sci 43, 7273–7279 (2008). https://doi.org/10.1007/s10853-008-2623-0
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10853-008-2623-0