Abstract
The interaction of equal channel angular extrusion (ECAE) with precipitation hardening during warm ECAE at 180°C in a Al-4.3 wt.% Mg-1.2 wt.% Cu alloy, annealed at various stages of ageing, was studied by room temperature compression tests and transmission electron microscopy. It was observed that peak aged samples lose much of their strength during ECAE due to fragmentation of precipitates. The highest strength after four ECAE passes (route Bc) at 180°C is obtained with samples in the under-aged condition although in this case dissolution of precipitates into the matrix occurs. After four ECAE passes fine equiaxed grains with an average size of approximately 200 nm with some traces of remnant elongated grains were obtained.
References
[1] Z.Horita, T.Fujinami, M.Nemoto, T.G.Langdon: Metall. Mater. Trans. A31 (2000) 691.10.1007/s11661-000-0011-8Search in Google Scholar
[2] R.Z.Valiev, R.K.Islamgaliev, I.V.Alexandrov: Prog. Mater. Sci.45 (2000) 103.10.1016/S0079-6425(99)00007-9Search in Google Scholar
[3] R.Z.Valiev, T.G.Langdon: Prog. Mater. Sci.51 (2006) 881.10.1016/j.pmatsci.2006.02.003Search in Google Scholar
[4] V.M.Segal: USSR Patent No. 575892, 1977.Search in Google Scholar
[5] V.M.Segal, V.I.Reznikov, A.E.Drobyshevskiy, V.I.Kopylov: Russian Metall.1 (1981) 99.Search in Google Scholar
[6] V.M.Segal: Mater. Sci. Eng. A197 (1995) 157.10.1016/0921-5093(95)09705-8Search in Google Scholar
[7] V.M. Segal, S.V. Dobatkin, R.Z. Valiev (Eds.): Equal-channel angular extrusion of metallic materials: Achievements and trends. Thematic issue, Part 1, Russian Metall, (2004) 1–102 [translated from Metally 2004, no. 1, pp. 3–119].Search in Google Scholar
[8] M.Furukawa, Z.Horita, M.Nemoto, T.G.Langdon: J. Mater. Sci.36 (2001) 2835.10.1023/A:1017932417043Search in Google Scholar
[9] M.Murayama, Z.Horita, K.Hono: Acta Mater.49 (2001) 21.10.1016/S1359-6454(00)00308-6Search in Google Scholar
[10] S.B.Kang, C.Y.Lim, H.W.Kim, J.Mao: Mater. Sci. Forum396–402 (2002) 1163.10.4028/www.scientific.net/MSF.396-402.1163Search in Google Scholar
[11] J.Mao, S.B.Kang, J.O.Park: J. Mater. Process Tech.159 (2005) 314.10.1016/j.jmatprotec.2004.05.020Search in Google Scholar
[12] B.Verlinden, M.Popovic: Mater. Sci. Forum503–504 (2005) 107.Search in Google Scholar
[13] S.Martinez de la Puente, B.Verlinden, L.Delaey: J. Mater. Sci.29 (1994) 6167.10.1007/BF00354557Search in Google Scholar
[14] J.T.Vietz, I.J.Polmear: J. Inst. Metals94 (1966) 410.Search in Google Scholar
[15] L.Reich, S.P.Ringer, K.Hono: Phil. Mag. Lett.79 (1999) 639.10.1080/095008399176689Search in Google Scholar
[16] S.P.Ringer, T.Sakurai, I.J.Polmear: Acta Mater.45 (1997) 3731.10.1016/S1359-6454(97)00039-6Search in Google Scholar
[17] P.Ratchev, B.Verlinden, P.De Smet, P.Van Houtte: Acta Mater.46 (1998) 3523.10.1016/S1359-6454(98)00033-0Search in Google Scholar
[18] P.Ratchev, B.Verlinden, P.De Smet, P.Van Houtte: Mater. Trans. JIM40 (1999) 34.Search in Google Scholar
[19] A.M.Zahra, C.Y.Zahra, B.Verlinden: Phil. Mag. Lett.86 (2006) 235.10.1080/09500830600678854Search in Google Scholar
[20] I.Gutierrez-Urrutia, M.A.Munoz-Morris, D.G.Morris: Mater. Sci. Eng. A394 (2005) 399.10.1016/j.msea.2004.11.025Search in Google Scholar
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