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• W130892535 abstract "Severe Plastic Deformation processes (SPD) have acquired a grate importance in the last decades in the production of nanostructured materials. Different processes have been developed by several research groups around the world and interesting results have been reported in the bibliography [1-5]. However, one of most attractive SPD processes is the Equal-Channel Angular Pressing (ECAP, see fig.1) because bulk materials with excellent mechanical properties and homogeneous deformation are produced by this technique. The aim of the present work is to study several aspects related to the microstructure obtained due to the ECAP process following a particular and most effective route (Route Bc) on pure copper samples and their influence on mechanical properties. Starting 99,98% pure Cu samples with an average grain size of ∼60 μm (fig. 2) were processed at room temperature by Equal-Channel Angular Pressing (ECAP) introducing severe plastic deformation. The microstructure and properties survey was carried out by microscopy and mechanical characterization. A significant decrease in grain size was observed by transmission electron microscopy resulting after 8 passes through the die, in grain sizes in the order of 250nm (fig. 3). Tensile and microhardness tests were carried out on the deformed material in order to correlate microstructure and mechanical properties. From the first passage through the ECAP die, an increase in mechanical properties was reported with a gradual small increase for the subsequent ECAP passes (table 1). The mechanism for the process has been studied and several steps can be related starting from deformation, dislocation motion, cells/subgrain generation (LAGB), and stabilisation as (HAGB). Fig. 1 Test system of the equal-channel angular pressing. Poster NanoSpain2008 14-18 April, 2008 Braga-Portugal Fig. 2 Microstructure of pure copper after Fig. 3 TEM image of a processed sample annealing at 600oC for 2 hours. (ECAP) after 8 passes. Table 1: Material Characterisation and properties Sample Grain Size (μm) Hardness HV Dislocation density ρ (m) YS(MPa) UTS(MPa) %RA* Annealed 65 70 ± 2 1.00E+14 200 275 95 1 pass 15 139 ± 5 3.45E+14 337 411 90 2 passes 0.99 150 ± 5 4.02E+14 415 429 91 3 passes 0.37 151 ± 3 4.89E+14 424 458 87 4 passes 0.34 152 ± 4 6.89E+14 448 469 86 5 passes 0.3 153 ± 3 8.12E+14 441 460 89 6 passes 0.31 156 ± 2 7.36E+14 459 480 85 7 passes 0.34 158 ± 2 6.32E+14 447 468 88 8 passes 0.25 157 ± 1 4.09E+14 477 498 88 *% Reduction of Area ACKNOWLEDGEMENTS.Thanks are given to the Ministry of Science and Technology of Spain to support the project DPI2005-09324-C02-01/02. NL thanks the scholarship (BES-2003-2754) granted by the Ministry of Science and Technology of Spain. REFERENCES.[1]V.M. Segal, V.I. Reznikov, A.E. Drobyshevskiy,V.I. Kopylov. 1981. Russian Metall.1, pp 99-105. [2]R.Z. Valiev, N.A. Krasilinikov, N.K. Tsenev. 1991. Mat. Sci. Eng. A 137, pp 35-40. M. Furukawa, Z. Horita, N. Nemoto, T.G. Langdon J. 2001.Materials Science.36, pp 2835-2843. [3]Y. Iwahashi, J. Wang, Z. Horita, M. Nemoto, T.G. Langdon. 1996. Scripta Mater.35, pp143-146. [4] N. A. Smirnova, V. I. Levit, V. I. Pilyugin, R. I.. Kuznetsov, L. S. Davydova and V. A. Sazonova: Fiz. Met. Metalloved., 61 (1986) 1170-1177. [5] G. Sakai, Z. Horita, T.G. Langdon, Mat. Sci. Eng. A 393 (2005) 344-351. [6] K. Nakashima, Z. Horita, M. Nemoto, T.G. Langdon, Acta Mater.; 46 (1998) 15891599.. [7] Y. Iwahashi, Z. Horita, M. Nemoto, T.G. Langdon, Acta Mater.; 46 (1998) 33173331. [8] B.L. Li, N. Shigeiri, N. Tsuji, and Y. Minamino, Materials Science Forum 503-504 (2006) 615-620. Poster NanoSpain2008 14-18 April, 2008 Braga-Portugal" @default.
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• W130892535 date "2008-01-01" @default.
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• W130892535 title "PURE COPPER DEFORMED BY EQUAL-CHANNEL ANGULAR PRESSING" @default.
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