A STUDY ON THE APPLICATION OF THE ECAP TO SURFACE PLATING

Abstract

Metal forming processes with 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. In the presented study, an approach of application of ECAP method was used in surface plating. Previously manufactured ECAP dies using separated die design approach were used in the study. 5083 Aluminum and Ms 58 Brass alloy strips having 2 and 4 mm thickness were placed in the ECAP die side by side and processed with single and double passes in order to model the metallic plating under cold pressure welding conditions. There were no successful and full joints between the strips although some partial joints were observed. The results were discussed and some suggestions are made in order to obtain successful joints.

Keywords

• ECAP, Separated Dies, Cold Pressure Welding, Plating, Material Tests

Kaynakça

1. R.Z. Valiev, T.G. Langdon: “Principles of equal-channel angular pressing as a processing Progress in Materials Science 51(2006) 881–981.
2. A. Azushima, R. Kopp, A. Korhonen, D.Y.Yang , F. Micari, G.D. Lahoti, P. Groche , Rosochowski, A. Yanagida : “Severe plastic deformation (SPD)processes for metals”, CIRP Annals - Manufacturing Technology 57 (2008) 716–735.
3. H.Gur, B.Ogel, H.Atala, S.Bor, E.Tan: “Aluminyum Alasimlarinin Asiri Plastik Deformasyon Turkish)”, http://uvt.ulakbim.gov.tr/uvt/index.php
4. B. Martin, S. Frantisek, B. Otto, G. Requena,: “ECAP vs. direct extrusion Techniques forconsolidation of ultra-fine Al particles”, Materials Science and Eng. A 504 (2009) 1–7.
5. H.W. Hoppel ,M. Kautz, C. Xu,M. Murashkin, T.G. Langdon, R.Z. Valiev, H. Mughrabi : “An behaviour of ultrafine-grained metals and alloys”, International Journal ofFatigue 28 (2006) 1001–1010.
6. Mumin Sahin, N. Balasubramanian, Cenk Misirli, H. Erol Akata, Yilmaz Can, Kaan Ozel, “On properties at interfaces of friction welded alloys”, Internatıonal Journal of Advanced Manufacturıng Technology Volume: 61 Issue: 9-12 Pages: 935-943 Al 5083
7. C.J. L. Perez: “On the correct selection of the channel die in ECAP processes”, Scrip. Materialia 50 (2004) 387–393.
8. J.P. Mathieu, S. Suwas, A. Eberhardt, L.S. T´oth , P. Moll: “A new design for equal channel Materials Processing Technology 173 (2006) 29–33.

9. S. Wang, W. Liang, Y. Wang, L. Bian, K. Chen: “A modified die for equal channel angularpressing”, Journal of Materials Processing Technology 209 ( 2009 ) 3182– 3186.
10. S.C. Yoon, P. Quang, S.I. Hong, H.S. Kim: “Die design for homogeneous plastic deformationduring equal channel angular pressing” Journal of Materials Processing Technology 187–188(2007) 46–50
11. L. Balasundar , M. S. Rao, T. Raghu : “Equal channel angular pressing die to extrude avariety of materials”, Materials and Design 30 (2009) 1050–1059.
12. C. Xu., T.G. Langdon:“Influence of a round corner die on flow homogeneity in ECA (2003) 1–4.
13. Sayime Sabit Kabasakal, Toshko M. Kovachev, Emil S. Kostov, H. Erol Akata, “A Study on the Application of Severe Plastic Deformation to Aluminum Alloys”, Journal of the Technical University of Gabrovo, Vol. 43’2012 (7-9), ISSN1310- 6686.
14. Akata,H.E. “Application of Separated Die Design to Production of ECAP Dies” Materials and Manufacturing Technologies XIV Book Series: Advanced Materials Research Volume: 445 Pages: 120-124 DOI:10.4028/www.scientific.net/AMR.44 5.120 Published: 2012
15. A. Lilleby, Ø. Gronga, H. Hemmer, “Cold pressure welding of severely plastically deformed extrusion”, Engineering A 527 (2010) 1351–1360
16. M. Zebardast, A. Karimi Taheri, “The cold welding of copper to aluminum using equal channel angular extrusion (ECAE) process” Journal Technology 211 (2011) 1034–1043 Processing
17. aalco-catalogue.pdf;inf.on http://www.aalco.co.uk/literature/default.a spx#Aluminium