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Vol.1 , No. 2, Publication Date: Jul. 7, 2014, Page: 60-68
 is a materials processing method that allows very high strains to be imposed, leading to extreme work hardening and microstructure refinement. Cast Cu-2, 5 and 10 wt% Sn alloys in the form of 25 mm diameter and 300 mm long rods are ECAPed through 12 mm diameter, 120o inner angle, and 20o out arc angle die. It is possible to ECAP those alloys for 5, 4, and 1 pass at room temperature, respectively. Grain size decreases of with increasing Sn content and number of ECAP passes. Besides, the ultimate tensile stress, proof strength, and hardness of Cu-2, 5 and 10%Sn alloys increase with Sn content and ECAP pass number. However, UTS of 2%Sn alloy reaches a maximum value after 4 passes, and that of 5%Sn alloy reaches its maximum after 3 passes. Moreover, the elongation percent decreases strongly after first ECAP pass. The elongation of Cu-2 and 5%Sn alloys begin to increase after second pass until third and fifth passes, respectively. On the other hand, the wear resistance is improved by increasing Sn content and number of ECAP pass, especially after first pass. Also, remarkable decrease is observed in surface roughness (Ra) by decreasing Sn content and by increasing the number of ECAP pass.&picture=http://www.aascit.org/aascit/decorators/img/journal/902.jpg)
| [1] | Elshafey. A. Gadallah , Mechanical Dept., Faculty of Industrial Education, Suez University, Egypt. |
| [2] | Mohamed. A. Ghanem , Mechanical Dept., Faculty of Industrial Education, Suez University, Egypt. |
| [3] | Mohamed. Abd El-Hamid , Mechanical Design & Prod, Dept., Faculty of Engineering, Zagazig University, Egypt. |
| [4] | Ahmed. E. El-Nikhaily , Mechanical Dept., Faculty of Industrial Education, Suez University, Egypt. |
Equal channel angular pressing (ECAP) is a materials processing method that allows very high strains to be imposed, leading to extreme work hardening and microstructure refinement. Cast Cu-2, 5 and 10 wt% Sn alloys in the form of 25 mm diameter and 300 mm long rods are ECAPed through 12 mm diameter, 120o inner angle, and 20o out arc angle die. It is possible to ECAP those alloys for 5, 4, and 1 pass at room temperature, respectively. Grain size decreases of with increasing Sn content and number of ECAP passes. Besides, the ultimate tensile stress, proof strength, and hardness of Cu-2, 5 and 10%Sn alloys increase with Sn content and ECAP pass number. However, UTS of 2%Sn alloy reaches a maximum value after 4 passes, and that of 5%Sn alloy reaches its maximum after 3 passes. Moreover, the elongation percent decreases strongly after first ECAP pass. The elongation of Cu-2 and 5%Sn alloys begin to increase after second pass until third and fifth passes, respectively. On the other hand, the wear resistance is improved by increasing Sn content and number of ECAP pass, especially after first pass. Also, remarkable decrease is observed in surface roughness (Ra) by decreasing Sn content and by increasing the number of ECAP pass.
Keywords
Cu/Sn Alloys, Microstructure, Mechanical Properties and Wear Resistance
Reference
| [01] | Gongjun. C, Qinling. B, Shengyu. Z, Jun. Y and Weimin. L, " Tribological behavior of Cu-6Sn-6Zn- 3Pb under sea water, distilled water and dry- sliding conditions ", Tribology International, vol. 55, pp. 126-134, (2012). |
| [02] | G. S, L. M, M. P and P. S, "Dry sliding wear of Cu- Be alloys", Wear, vol. 259, pp 506-511, (2005). |
| [03] | X.C. Ma, G.Q. He, D.H. He, C. S. Chen and Z. F. Hu, "Sliding wear behavior of copper-graphite composite material for use in maglev transportation system", Wear, vol. 265, pp 1087-1092, (2008). |
| [04] | J. B. Singh, W. Cai and P. Bellon, "Dry sliding of Cu-15wt% Ni-8wt% Sn bronze: Wear behaviour and microstructures", Wear, vol. 263, pp 830-841, (2007). |
| [05] | Da. H. He and Rafael. M, "A novel electrical contact material with improved self-lubrication for railway current collectors", Wear,vol. 249, pp 626-636,(2001). |
| [06] | S.C. Ho, J.H. Chern Lin and C.P. Ju, "Effect of fiber addition on mechanical and tribological properties of A copper/phenolic-based friction material", Wear, vol. 258, pp 861-869, (2005). |
| [07] | Z. C, P . L, J. D. Verhoeven and E. D. Gibson, "Electrotribological behavior of Cu-15 vol.% Cr in situ composites under dry sliding ", Wear, vol. 204, pp 28-35, (1997). |
| [08] | Gongjun . C, Qinling. B, Shengyu. Z, Jun. Y and Weimin. L,"Tribological properties of bronze-graphite composites under sea water condition", Tribology International, vol. 53, pp 76-86, (2012). |
| [09] | Xueping. G, Ga. Z, Wen-Ya. Li, Lucas. D, Yang. G, Hanlin. L and Christian. C, " Microstructure, microhardness and dry friction behaviour of cold-sprayed tin bronze coatings", Applied Surface Science, vol. 254, pp 1482-1488, (2007). |
| [10] | R.Z. Valiev, R. K. Islamgaliev and I. V. Alexandrov, "Bulk nanostructured materials from severe plastic deformation", Progress in Materials Science, vol. 45, pp 103-189, (2000). |
| [11] | I. V. Alexandrov and R. Z. Valiev, " Developing of SPD processing an enhanced properties in bulk nanostructured metals ", Scripta mater, vol. 44, pp 1605-1608, (2001). |
| [12] | Yuntian T. Zhu, Terry C. Lowe and Terence G. Langdon, " Performance and appli-cations of nanostructured materials produced by severe plastic deformation ", Scripta Materialia, vol. 51, pp 825-830, (2004). |
| [13] | L. L. Gao and X. H. Cheng, "Effect of ECAE on Microstructure and Tribological Properties of Cu-10%Al-4%Fe Alloy ", Tribol Lett, vol. 27, pp 221-225, (2007). |
| [14] | Dmitry. O and Alexei. V, " The control of texture to improve high-cyclic fatigue performance in copper after equal channel angular pressing", Materials Science and Engineering, vol. A 530, pp 174-182, (2011). |
| [15] | V. M. Segal, "Materials processing by simple shear", Ma-terials Science and Engineering, vol. A 197, pp 157-164, (1995). |
| [16] | Yoshinori. I, Jingtao. W, Zenji. H and Minoru. N, "Principle of Equal-channel angular pressing for the processing of ul-tra-fine grained materials ", Scripta Materialia, vol. 35, pp 143-146, (1996). |
| [17] | K. N, T. U, A. Y, K. N, Z. H and T.G. Langdon, "Low-temperature superplasticity in a Cu-Zn-Sn alloy processed by severe plastic deformation" , Materials Science and Engineering, vol. A 307, pp 23-28, (2001). |
| [18] | Q. J. Wang, Z. Z. Du, L. Luo and W. Wang, "Fatigue properties of ultra-fine grain Cu-Cr alloy processed by equal-channel angular pressing", J. Alloys Compd, vol. 526, pp 39-44, (2012). |
| [19] | S. Q, X. H. An, H. J. Yang, C. X. Huang, G. Yang, Q. S. Zang, Z. G. Wang, S. D. Wu and Z. F. Zhang, "Microstructural evolution and mechanical properties of Cu-Al alloys subjected to equal channel angular pressing", Acta Materialia, vol. 57, pp 1586-1601, (2009). |
| [20] | Naoki. T, Seong-Hee. L and Nobuhiro. T, " Ultrafine grained copper alloy sheets having both high strength and high electric conductivity ", Materials Letters, vol. 63, pp 1757-1760, (2009). |
| [21] | D. R. Fang, Z. F. Zhang, S. D. Wu, C. X. Huang, H. Zhang, N. Q. Zhao and J. J. Li, " Effect of equal Channel angular pressing on tensile properties and fracture modes of casting Al-Cu alloys", Materials Sci-ence and Engineering, vol. A 426, pp 305-313, (2006). |
| [22] | L. L. Gao and X. H. Cheng, " Micro-structure, phase transformation and wear behavior of Cu-10 % Al 4%Fe alloy processed by ECAE ", Materials Science and Engineering, vol. A 473, pp 259-265, (2008). |
| [23] | D. E. Lozano, R. D. Mercado-Solis, A.J. Perez, J. T and F. Morales, " Tribological behavior of cast hypereutectic Al-Si-Cu alloy subjected to sliding wear ", Wear, vol. 267, pp 545-549, (2009). |
| [24] | L.L. Gao and X. H. Cheng, "Microstructure and dry sliding wear behavior of Cu-10%Al-4%Fe alloy produced by equal channel angular extrusion", Wear, vol. 265, pp 986-991, (2008). |
| [25] | Bekir S. Ünlü and Enver A, " Evaluation of effect of alloy elements in copper based CuSn10 and CuZn30 bearings on tribological and mechanical properties ", Journal of Alloys and Compounds, vol. 489, pp 262-268, (2010). |
| [26] | A S M Handbook Committee , " Metallography and microstructures", Vol. 9, pp, 1848-1850, (2004). |
| [27] | Richard, H, Carl. L, " Principles of metal casting ", Journal of the Franklin Institute, vol. 261, pp 578, Issue 5, May, book (1956). |
