Superplasticity and Superplastic Formability of Hot-Rolled AZ31 Magnesium Alloy


Article Preview

The superplasticity of a hot-rolled AZ31 Mg alloy was investigated by uniaxial tensile tests at temperature range 250-450oC and strain rate range 0.7×10-3-1.4×10-1s-1. Superplastic formability of the alloy was evaluated by gas bulging test at elevated temperatures. The threshold stress for grain boundary sliding (GBS) was calculated and the topography during superplastic deformation was observed by SEM. It is found that, at 400 oC and 0.7×10-3 s-1, the maximum elongation reaches 362.5%. GBS is the predominant deformation mechanism and characterized by a pronounced improvement in homogeneity with increasing temperatures, indicating a transformation of GBS mode from cooperative GBS (CGBS) to individual GBS (IGBS). The improved homogeneity of GBS can be interpreted in terms of decreased threshold stress with increasing temperatures. Gas bulging test demonstrates that the temperature for the best superplastic formability is 400 oC and a hemispherical part with a specific limiting dome height of 0.51 was obtained, suggesting good application prospect for this alloy.



Materials Science Forum (Volumes 551-552)

Edited by:

K.F. Zhang




D.L. Yin et al., "Superplasticity and Superplastic Formability of Hot-Rolled AZ31 Magnesium Alloy", Materials Science Forum, Vols. 551-552, pp. 231-235, 2007

Online since:

July 2007




[1] T. Mohri, M. Mabuchi and M. Nakamura: Mater. Sci. Eng., Vol. A290 (2000), p.139.

[2] W.J. Kim, S.W. Chung and C.S. Chung: Acta Mater., Vol. 49 (2001), p.3337.

[3] X. Wu and Y. Liu: Scr. Mater., Vol. 46 (2002), p.269.

[4] J.C. Tan and M.J. Tan: Scr. Mater., Vol. 47 (2002), p.101.

[5] H. Watanabe, T. Mukai and K. Ishikawa: Scr. Mater., Vol. 46 (2002), p.851.

[6] D.L. Yin, K.F. Zhang, G.F. Wang and W.B. Han: Mater. Letters, Vol. 59 (2005), p.1714.

[7] T.G. Nieh, J. Wadsworth and O.D. Sherby: Superplasticity in Metals and Ceramics. ( Cambridge University Press, Cambridge 1997).

[8] F.A. Mohamed: J. Mater. Sci., Vol. 18 (1983), p.582.

[9] D.L. Yin, K.F. Zhang and G.F. Wang: Mater. Sci. Forum, Vol. 475-479 (2005), p.2923.

[10] B.L. Aflonso, J.M. Manuel and D.R. Arturo: Scr. Mater., Vol. 34 (1996), p.1155.

[11] H.J. Frost and M.F. Ashby: Deformation-mechanism maps. ( Pergamon Press, Oxford 1982).

[12] O.A. Kaibyshev, A.I. Pshenichniuk and V.V. Astanin: Acta Mater., Vol. 46 (1998), p.4911.

[13] R. Kaibyshev, F. Musin, D.R. Lesuer and T.G. Nieh. Mater. Sci. Eng., Vol. A342 (2003), p.169.