Constitutive Equation of an Al-12.7Si-0.7Mg Alloy in Superplastic Deformation

Abstract:

The hot deformation characteristics of Al-12.7Si-0.7Mg alloy were investigated on an Instron5500 electronic universal testing machine at strain rates ranging from 1.67×10^-4 s^-1 to 1.67×10^-3 s^-1 and testing temperatures ranging from 460 °C to 520 °C. The results show that strain rate had a great effect on the flow stress. The flow stress increased with increasing the strain rate. The true stress-strain curves of the Al-12.7Si-0.7Mg alloy were obtained, and the strain rate sensitivity and hot deformation parameters of deformation activation energy were calculated. The hot deformation constitutive equation with hyperbolic sine form was also obtained. The test calculations demonstrate that the constitutive equation describes the deformation features of the Al-12.7Si-0.7Mg alloy well.

• Periodical: Advanced Materials Research (Volumes 415-417)
• Pages: 1147-1152
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.415-417.1147
• Online since: December 2011
• Authors: Yin Ben Han, Zhuo Liang Li, Ge Zhou, Fu Rong Cao, Hua Ding, Fu Xiao Yu
• Keywords: Al-Si Alloy, Constitutive Equation, Superplastic Deformation

References

[1] G.M. Lu, L.Q. Zhi and M.T. Ma: Auto. Eng. Vol. 5 (2009), p.430 (In Chinese)

[2] A. Jambor, M. Beyer: Mater. Des. Vol. 18(4-6) (1997), p.203

[3] W.S. Miller: Mater. Sci. Eng. A Vol. 280 (2000), p.37

[4] D.T. Niu: Locomo. Rolling Stock Technol. Vol. 3 (2006), p.1 (In Chinese)

[5] A.B. Ma, K. Suzuki, N. Saito, I. Shigematsu, M. Takagi, H. Iwata, A. Watazu and T. Imura: Acta Mater. Vol. 53(1/3) (2005), p.211

[6] C.M. Sellars, W.J. McTegart: Acta Metall. Vol. 14(9) (1966), p.1136

[7] H. Shi, A.J. McLaren and C.M. Sellars: Mater. Sci. Eng. A Vol. 13(3) (1997), p.210

[8] N.K. Park, J.T. Yeom and Y.S. Na: J. Mater. Proc. Technol. Vol. 130-131 (2002), p.540

[9] J.K. Chakravartty, G.K. Dey and S. Banerjee: Nucl. Mater. Vol. 218 (1995), p.247

[10] M.C. Somani, N.C. Birla, Y.V.R.K. Prasad: J. Mater. Proc Technol. Vol. 52 (1995), p.225

[11] V.V. Balasubrahmanyam, Y.V.R.K. Prasad: Mater. Sci. Eng. A. Vol. 336 (2002), p.150

[12] S.W. Lee, J.W. Yeh: Mater. Sci. Eng. A Vol. 460-461 (2007), p.409

[13] X.G. Jiang, J.Z. Cui, L.X. Ma: Metal Sci. Technol. Vol. 9(4) (1990), p.72 (In Chinese)