Abstract
Equal channel angular extrusion (ECAE) experiments of an extruded Mg–Zn–Y–Zr alloy with an intense basal texture were performed up to 8 passes at 250 and 350 °C through route Bc (billets with a rotation of 90° in the same direction between passes) and route A (without rotation between passes). It was found that under these ECAE conditions significant grain refinement was achieved. The initial texture of the alloy gradually altered as the number of ECAE passes increased. The ductility of the alloy was improved in all the cases after eight passes. The yield strength of the alloy ECAEed through route Bc considerably decreased with the passes increasing, as a result of the formation of the texture component with the basal planes inclined at about 45° to the ECAE direction. The yield strength of the material ECAEed at 250 °C with a finer grain structure was considerably lower than that at 350 °C with a coarser grain structure. This abnormal phenomenon was attributed to more crystals in the former being oriented to be more favorable for basal slip.
References
[1] S.B.Yi, C.H.J.Davies, H.G.Brokmeier, R.E.Bolmaro, K.U.Kainer, J.Homeyer: Acta Mater.54 (2006) 549.10.1016/j.actamat.2005.09.024Search in Google Scholar
[2] A.Bussiba, A.Ben Artzy, A.Shtechman, S.Ifergan, M.Kupiec: Mater. Sci. Eng. A302 (2001) 56.10.1016/S0921-5093(00)01354-XSearch in Google Scholar
[3] L.Jin, D.L.Lin, D.L.Mao, X.Q.Zeng, W.J.Ding: Mater. Lett.59 (2005) 2267.10.1016/j.matlet.2004.09.061Search in Google Scholar
[4] R.Z.Valiev, T.G.Langdon: Prog. Mater. Sci.51 (2006) 881.10.1016/j.pmatsci.2006.02.003Search in Google Scholar
[5] T.Liu, Y.D.Wang, S.D.Wu, R.L.Peng, C.X.Huang, C.B.Jiang, S.X.Li: Scripta Mater.51 (2004) 1057.10.1016/j.scriptamat.2004.08.007Search in Google Scholar
[6] A.Yamashita, Z.Horita, T.G.Langdon: Mater. Sci. Eng. A300 (2001) 142.10.1016/S0921-5093(00)01660-9Search in Google Scholar
[7] T.Mukai, M.Yamanoi, H.Watanabe, K.Higashi: Scripta Mater.45 (2001) 89.10.1016/S1359-6462(01)00996-4Search in Google Scholar
[8] W.J.Kim, S.I.Hong, Y.S.Kim, S.H.Min, H.T.Jeong, J.D.Lee: Acta Mater.51 (2003) 3293.10.1016/S1359-6454(03)00161-7Search in Google Scholar
[9] Y.Yoshida, L.Cisar, S.Kamado, Y.Kojima: Mater. Trans.44 (2003) 468.10.2320/matertrans.45.2537Search in Google Scholar
[10] D.H.Bae, S.H.Kim, D.H.Kim, W.T.Kim: Acta Mater.50 (2002) 2343.10.1016/S1359-6454(02)00067-8Search in Google Scholar
[11] M.Y.Zheng, X.G.Qiao, S.W.Xu, K.Wu, S.Kamado, Y.Kojima: Mater. Sci. Forum488–489 (2005) 589.10.4028/www.scientific.net/MSF.488-489.589Search in Google Scholar
[12] M.Y.Zheng, S.W.Xu, X.G.Qiao, W.M.Gan, K.Wu, S.Kamado, Y.Kojima, H.G.Brokmeier: Mater. Sci. Forum503–504 (2006) 527.10.4028/www.scientific.net/MSF.503-504.527Search in Google Scholar
[13] Y.Iwahashi, J.Wang, Z.Horita, M.Nemoto, T.G.Langdon: Scripta Mater.35 (1996) 143.10.1016/1359-6462(96)00107-8Search in Google Scholar
[14] S.Y.Chang, S.W.Lee, K.M.Kang, S.Kamado, Y.Kojima: Mater. Trans.45 (2004) 488.10.2320/matertrans.45.488Search in Google Scholar
[15] K.Xia, J.T.Wang, X.Wu, G.Chen, M.Gurvan: Mater. Sci. Eng. A410 (2005) 324.10.1016/j.msea.2005.08.123Search in Google Scholar
[16] Q.Yang, A.K.Ghosh: Acta Mater.54 (2006) 5159.10.1016/j.actamat.2006.06.043Search in Google Scholar
[17] A.Yamashita, D.Yamaguchi, Z.Horita, T.G.Langdon: Mater. Sci. Eng. A287 (2000) 100.10.1016/S0921-5093(00)00836-4Search in Google Scholar
[18] S.Kleiner, P.J.Uggowitzer: Mater. Sci. Eng. A379 (2004) 258.10.1016/j.msea.2004.02.020Search in Google Scholar
[19] E.W.Kelley, W.F.Hosford: Trans. AIME242 (1968) 5.Search in Google Scholar
[20] S.R.Agnew, J.A.Horton, T.M.Lillo, D.W.Brown: Scripta Mater.50 (2004) 377.10.1016/j.scriptamat.2003.10.006Search in Google Scholar
[21] H.Watanabe, A.Takara, H.Somekawa, T.Mukai, K.Higashi: Scripta Mater.52 (2005) 449.10.1016/j.scriptamat.2004.11.011Search in Google Scholar
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