Superplastic Deformation of Ultrafine Grained Al Alloy Processed by ECAP and Post-Rolling


Article Preview

Superplastic behavior of an ultrafine grained (UFG) 5154 Al alloy processed by ECAP and cold rolling (ECAP+CR sample) was investigated and compared with that of the alloy processed by only ECAP without rolling (ECAP sample) in the strain rate range of 10-4~5×10-1 s-1 at 723 K. Processing of the ECAP+CR sample consisted of ECAP of 4 passes, which was less than that showing the optimum microstructure for high strain rate superplasticity of UFG Al alloys (i.e. 8 passes), with route Bc and subsequent cold rolling (70% thickness reduction). The superplastic elongation was remarkably enhanced by post-rolling. An analysis of the mechanical data revealed that deformation of the ECAP+CR sample was dominated by grain boundary sliding, but dislocation viscous glide was the main deformation mechanism for the ECAP sample. In addition, cavitation in the ECAP+CR sample was insignificant up to ∼300% elongation.



Materials Science Forum (Volumes 503-504)

Edited by:

Zenji Horita




K. T. Park et al., "Superplastic Deformation of Ultrafine Grained Al Alloy Processed by ECAP and Post-Rolling", Materials Science Forum, Vols. 503-504, pp. 119-124, 2006

Online since:

January 2006




[1] Z. Horita, T. Fujinami, M. Nemoto and T.G. Langdon: Metall. Mater. Trans. A, Vol. 31A (2000), p.691.

[2] S.Y. Chang, G.K. Lee, K. -T. Park and D.H. Shin: Mater. Trans. (JIM), Vol. 42 (2001), p.1074.

[3] S. Komura, M. Furukawa, Z. Horita, M. Nemoto and T.G. Langdon: Mater. Sci. Eng., Vol. A297 (2000), p.111.

[4] O.V. Mishin, D. Juul Jensen and N. Hansen: Mater. Sci. Eng., Vol. A342 (2000), p.320.

[5] R.R. Sawtell and C.L. Jensen: Metall. Trans. A, Vol. 21A (1990), p.421.

[6] K. -T. Park, S.H. Myung, D.H. Shin and C.S. Lee: Mater. Sci. Eng., Vol. A371 (2004), p.178.

[7] M.J. Stowell: Metal Sci., Vol. 17 (1983), p.1.

[8] A. Needleman and J.R. Rice: Acta Metall., Vol. 28 (1980), p.1315.

[9] H.J. Frost and M.F. Ashby: Deformation Mechanism Map (Pergamon Press, Oxford, UK 1982).

[10] L. Dupuy, J. -J. Brandin: Acta Mater., Vol. 50 (2002), p.1251.