Application of Separated Die Design to Production of Ecap Dies

Abstract:

Metal forming processes with principally shear stresses that very high plastic strains are obtained in one pass are defined as severe plastic deformation (SPD) processes. Strain values can additionally be increased with additional passes throughout the process. Equal channel angular processing (ECAP) is the most applied method among the SPD processes due to relative ease of die manufacturing. On the other hand, die failures like corner cracking are frequently observed due to high notch effect and therefore use of the dies is limited. In the presenting study multi element die design (separated die design) approach was applied to production of ECAP dies in order to eliminate die failures and 5083 Aluminum alloy specimen were deformed with several passes. Although some additional development for die arrangement and fixation are needed, corner cracking was never observed and dies could be used safely.

• Periodical: Advanced Materials Research (Volume 445)
• Pages: 120-124
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.445.120
• Online since: January 2012
• Authors: Huseyin Erol Akata
• Keywords: Die Design, ECAP, Separated Dies

References

[1] R.Z. Valiev, T.G. Langdon: Principles of equal-channel angular pressing as a processing tool for grain refinement, Progress in Materials Science 51(2006) 881–981.

DOI: 10.1016/j.pmatsci.2006.02.003

[2] A. Azushima, R. Kopp, A. Korhonen, D.Y. Yang , F. Micari, G.D. Lahoti, P. Groche , J. Yanagimoto, N. Tsuji, A. Rosochowski, A. Yanagida : Severe plastic deformation (SPD) processes for metals, CIRP Annals - Manufacturing Technology 57 (2008).

DOI: 10.1016/j.cirp.2008.09.005

[3] H. Gur, B. Ogel, H. Atala, S. Bor, E. Tan: Aluminyum Alasimlarinin Asiri Plastik Deformasyon Islemleriyle Uretimi(in Turkish), information on http: /uvt. ulakbim. gov. tr/uvt/index. php.

[4] B. Martin, S. Frantisek, B. Otto, G. Requena,: ECAP vs. direct extrusion—Techniques for consolidation of ultra-fine Al particles, Materials Science and Eng. A 504 (2009) 1–7.

DOI: 10.1016/j.msea.2008.12.014

[5] H.W. Hoppel ,M. Kautz, C. Xu,M. Murashkin, T.G. Langdon, R.Z. Valiev, H. Mughrabi : An overview: Fatigue behaviour of ultrafine-grained metals and alloys, International Journal of Fatigue 28 (2006) 1001–1010.

DOI: 10.1016/j.ijfatigue.2005.08.014

[6] C.J. L. Perez: On the correct selection of the channel die in ECAP processes, Scripta Materialia 50 (2004) 387–393.

DOI: 10.1016/j.scriptamat.2003.10.007

[7] J.P. Mathieu, S. Suwas, A. Eberhardt, L.S. T´oth , P. Moll: A new design for equal channel angular extrusion, Journal of Materials Processing Technology 173 (2006) 29–33.

DOI: 10.1016/j.jmatprotec.2005.11.007

[8] S. Wang, W. Liang, Y. Wang, L. Bian, K. Chen: A modified die for equal channel angular pressing, Journal of Materials Processing Technology 209 ( 2009 ) 3182–3186.

DOI: 10.1016/j.jmatprotec.2008.07.022

[9] S.C. Yoon, P. Quang, S.I. Hong, H.S. Kim: Die design for homogeneous plastic deformation during equal channel angular pressing, Journal of Materials Processing Technology 187–188 (2007) 46–50.

DOI: 10.1016/j.jmatprotec.2006.11.117

[10] L. Balasundar , M. S. Rao, T. Raghu : Equal channel angular pressing die to extrude a variety of materials, Materials and Design 30 (2009) 1050–1059.

DOI: 10.1016/j.matdes.2008.06.057

[11] C. Xu., T.G. Langdon: Influence of a round corner die on flow homogeneity in ECA pressing, Scripta Materialia 48 (2003) 1–4.

DOI: 10.1016/s1359-6462(02)00354-8

[12] aalco-catalogue. pdf ; inf. on http: /www. aalco. co. uk/literature/default. aspx#Aluminium.