Numerical and Experimental Investigation of Strain Inhomogeneity during Cyclic Channel Die Compression

Abstract:

Severe plastic deformation (SPD) can refine conventional coarse-grained materials to submicrometer or even nanometer level. In this paper, effective strain distribution was simulated by rigid-plastic finite element method (FEM) after multi-pass cyclic channel die compression (CCDC) by two different processing routes, and the Vickers microhardness was examined to verify the deformation distribution. The results show that large strain can be accumulated in the material by CCDC. The deformation distribution is non-uniform. Apart from the edges or corners of the specimen, the effective strain is higher in the central region and lower at the surrounding region. The effective strain gradient increases with the number of compression. The microhardness distribution features of two routes are in agreement with the simulation results of strain distribution. The microhardness increases globally with the number of compression and its distribution is inhomogeneous at the small and medium strain stage. But with the increasing of strain, the microhardness homogeneity is improved.

• Periodical: Materials Science Forum (Volume 682)
• Pages: 159-165
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.682.159
• Online since: March 2011
• Authors: Feng Jian Shi, Lei Gang Wang, Sheng Lu, Zhong Fu Huang
• Keywords: Cyclic Channel Die Compression, Effective Strain, Finite Element (FE) Simulation, Strain Inhomogeneity, Vickers Microhardness

References

[1] R.Z. Valiev, R.K. Islamgaliev and I.V. Alexandrov: Prog. Mater Sci. Vol. 45 (2000), p.103.

[2] R.Z. Valiev and T.G. Langdon: Prog. Mater Sci. Vol. 51 (2006), p.881.

[3] R.B. Figueiredo and T.G. Langdon: Scripta Mater. Vol. 61 (2009), p.84.

[4] M. Furukawa, Z. Horita and T.G. Langdon: Mater. Sci. Eng. Vol. A503 (2009), p.21.

[5] M. Kai, Z. Horita, and T.G. Langdon: Mater. Sci. Eng. Vol. A488 (2008), p.117.

[6] A.P. Zhilyaev and T.G. Langdon: Prog. Mater Sci. Vol. 53 (2008), p.893.

[7] M. Shaarbaf and M.R. Toroghinejad: Mater. Sci. Eng. Vol. A473 (2008), p.28.

[8] M.Z. Quadir, M. Ferry, O. Al-Buhamad and P.R. Munroe: Acta Mater. Vol. 57(2009), p.29.

[9] H. Miura, T. Sakai, T. Ueno1, N. Fujita, and N. Yoshinaga: Mater. Sci. Forum Vol. 550 (2007), p.271.

[10] A. Belyakov, T. Sakai, H. Miura, and R. Kaibyshev: Scripta Mater. Vol. 42 (2000), p.319.

[11] A. Belyakov, T. Sakai, H. Miura and K. Tsuzaki: Philosophical Magazine A Vol. 81 (2001), p.2629.

[12] M. Zehetbauer and R.Z. Valiev: Nanomaterials by Severe Plastic Deformation (Wiley-VCH Publishers, Vienna, Austria, 2002).

[13] Y. Estrin, L.S. Toth, A. Molinari and Y. Brechet: Acta Mater. Vol. 46 (1998), p.5509.