Projection of Extrusion Force of Spray-Formed Al-25wt%Si with High Temperature Compression

Abstract:

The extrusion forces of the spray-formed Al-25wt%Si alloy at various strain rates and temperatures were calculated with the flow stresses obtained from high temperature compressive tests. The compressive stress-strain curves of the spray-formed Al-25wt%Si at various temperatures and strain rates were determined and discussed. The constitutive equation of strain rate as a function of stress and temperature described by, n Q RT A e ' / sinh( ) − ε& = ασ for the spray-formed Al-25wt%Si alloy, was established. The activation energy and constants in the constitutive equation were discussed and compared to other Al alloys. A direct extrusion experiment was employed to evaluate the extrusion loads vs. ram displacement at various temperatures and strain rates. By applying the constitutive equation, the extrusion loads were calculated and compared to the experimental ones for various temperatures and strain rates. The accuracy of the calculated results compared to the experimental results was discussed.

• Periodical: Materials Science Forum (Volumes 539-543)
• Pages: 374-379
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.539-543.374
• Online since: March 2007
• Authors: C.H. Chiang, Chi Tsao
• Keywords: Compression, Constitutive Equation, Extrusion, Hypereutectic Al-Si Alloy, Spray Forming

References

[1] J.L. Estrada and J. Duszczyk: J. Mater. Sci., Vol. 25 (1990) p.1381.

[2] V.C. Srivastava, R.K. Mandal and S.N. Ojha: Mater. Sci. Eng. A, Vol. 304-306 (2001), p.555.

[3] Y. -H.F. Su, C. -S.S. Chiang and Chi Y.A. Tsao: Mater. Sci. Eng. A, Vol. 364 (2004), p.305.

[4] C.Y. Chen and Chi Y.A. Tsao: Mater. Sci. Eng. A, Vol. 383 (2004), p.21.

[5] T.K. Ha, W.J. Park, S. Ahn and Y.W. Chang: J. Mater. Process. Technol., Vol. 130 (2002), p.691.

[6] C. -H. Chiang and Chi Y. A. Tsao: Mater. Sci. Eng. A, Vol. 417 (2006), p.90.

[7] C. -H. Chiang and Chi Y. A. Tsao: Key Eng. Mater., Vol. 249 (2003), p.189.

[8] George E. Dieter: Mechanical metallurgy (McGraw-Hill Book Company, 1988).

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

[10] J. Zhou, J. Duszczyk and B.M. Korevaar: J. Mater. Sci., Vol. 27 (1992), p.4247.

[11] Y. -C. Yoo and B. -C. Ko: Compos. Sci. Technol., Vol. 58 (1998), p.479.

[12] M. Ferry and P.R. Munroe: Mater. Sci. Technol., Vol. 11 (1995), p.633.

[13] S.S. Bhattacharya, G.V. Satishnarayana and K.A. Padmanghan: J. Mater. Sci., Vol. 30 (1995), p.5850.

[14] H.J. McQueen, P. Sakaris and J. Bowles:, International Conference on Advanced Composite Materials, Wollongong, Australia (1993), p.1193.