Simulating of Backward Extrusion Process of Nanostructured Al-6082 Material

Abstract:

Backward extrusion (it is also called indirect extrusion) is an extrusion process in which the billet is placed in the container cavity, and where the movement of the punch is in the opposite direction to the movement of the flow of the metal. In this work the backward extrusion were applied on a nanostructured material. the extruded material were three types of nanostructured Al-6082 alloy Pass 1, pass 4(route C), pass8 (route C) which are produced by equal channel angular pressing (ECAP), in addition to the annealed Al-6082 material. The experimental results show that the pass 8 (route C) has the maximum value of extrusion loads and high value of hardness. From the finite element simulation it observed that the maximum value of equivalent strain was when the pass 4 material was used, while the equivalent strain of pass 1 and pass 8 seem to be equal and that the maximum flow stress was obtained when the pass 8 material was used. Well visible crack appeared at the top edge of all cups that made from pass 8 material

• Periodical: Advanced Materials Research (Volume 1043)
• Pages: 133-137
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1043.133
• Online since: October 2014
• Authors: Ahmed S.M.J. Agena*
• Keywords: Backward Extrusion Processes, Finite Element Method (FEM), Nanostructured Al-6082 Alloy

References

[1] Sivaraman, Uday Chakkingal: Investigations on workability of commercial purity aluminum processed by equal channel angular pressing, J. Mater. Process. Technol, Vol. 202 ( 2008), pp.543-548.

DOI: 10.1016/j.jmatprotec.2007.10.006

[2] Masakazu Kamachi, Minoru Furukawa, Zenji Horita and Terence G. Langdon: Equal-channel angular pressing using plate samples, Journal of Materials Science and Engineering A, Vol. 361(2003), pp.258-266.

DOI: 10.1016/s0921-5093(03)00522-7

[3] K. Nakashima, Z. Horita, M. Nemoto, and T.G. Langdon: Influence of Channel Angle on the Development of Ultrafine Grain in Equal-Channel Angular Pressing, Acta Mater, Vol. 46, No. 5(1998), pp.1589-1599.

DOI: 10.1016/s1359-6454(97)00355-8

[4] R.Z. Valiev, R.K. Islamgaliev, I.V. Alexandrov: Bulk nanostructured materials from severe plastic deformation, Progress in Material Science 45 (2000), pp.103-189.

DOI: 10.1016/s0079-6425(99)00007-9

[5] M. Sabor, M. Bakhshi-Joobari, M. Noorani-Azad ,A. Gorji : Experimental and numerical study of energy consumption in forward and backward rod extrusion, J. Mater. Process. Technol, Vol. 177 (2006), p.612–616.

DOI: 10.1016/j.jmatprotec.2006.04.031

[6] Gyorgy Krallics, Ahmed. Agena: Tube Extrusion of Nanostructured Al-6082 Materials, 6th Hungarian Materials Science Conference-OAK, (2007).

[7] Muamar Isa: Production of bulk nanostructured material and investigation  of their behaviors in given technological process, (Master thesis 2005). Budapest university of technology and economics. Budapest.