Abstract
The microstructure and mechanical properties of extruded Mg-2.5Zn-0.5Y alloy before and after annealing treatments were investigated. The as-extruded alloy exhibits a yield tensile strength (YTS) of 305.9 MPa and an ultimate tensile strength (UTS) of 354.8 MPa, whereas the elongation is only 4%. After annealing, the YTS and UTS decrease to 150 MPa and 240 MPa, respectively, and the elongation increases to 28%. Interestingly, the annealed alloy maintains an acceptable stress level even after a much higher ductility is achieved. These excellent mechanical properties stem from the combined effects of fine α-Mg dynamic recrystallization (DRX) grains and a homogeneously distributed icosahedral quasicrystalline phase (I-phase) in the α-Mg DRX grains. In particular, the superior ductility originates from the coherent interface of I-phase and α-Mg and from the formation of the secondary twin \(\{ 10\bar 11\} - \{ 10\bar 12\} (38^ \circ < 1\bar 210 > )\) in the tension twin \(\{ 10\bar 12\}\).
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X.Y. Lou, M. Li, R.K. Boger, S.R. Agnew, and R.H. Wagoner, Hardening evolution of AZ31B Mg sheet, Int. J. Plast., 23(2007), No. 1, p. 44.
J. Bohlen, S.B. Yi, D. Letzig, and K.U. Kainer, Effect of rare earth elements on the microstructure and texture development in magnesium-manganese alloys during extrusion, Mater. Sci. Eng. A, 527(2010), No. 26, p. 7092.
C.J. Boehlert and K. Knittel, The microstructure, tensile properties, and creep behavior of Mg-Zn alloys containing 0–4.4 wt.% Zn, Mater. Sci. Eng. A, 417(2006), No. 1–2, p. 315.
X.F. Guo, S. Remennik, C.J. Xu, and D. Shechtman, Development of Mg-6.0%Zn-1.0%Y-0.6%Ce-0.6%Zr magnesium alloy and its microstructural evolution during processing, Mater. Sci. Eng. A, 473(2008), No. 1–2, p. 266.
N. Stanford, Micro-alloying Mg with Y, Ce, Gd and La for texture modification: a comparative study, Mater. Sci. Eng. A, 527(2010), No. 10–11, p. 2669.
N. Stanford and M. Barnett, Effect of composition on the texture and deformation behaviour of wrought Mg alloys, Scripta Mater., 58(2008), No. 3, p. 179.
H. Li, W.B. Du, S.B. Li, and Z.H. Wang, Effect of Zn/Er weight ratio on phase formation and mechanical properties of as-cast Mg-Zn-Er alloys, Mater. Des., 35(2012), p. 259.
D.H. Bae, S.H. Kim, D.H. Kim, and W.T. Kim, Deformation behavior of Mg-Zn-Y alloys reinforced by icosahedral quasicrystalline particles, Acta Mater., 50(2002), No. 9, p. 2343.
J.Y. Lee, H.K. Lim, D.H. Kim, W.T. Kim, and D.H. Kim, Effect of volume fraction of quasicrystal on the mechanical properties of quasicrystal-reinforced Mg-Zn-Y alloys, Mater. Sci. Eng. A, 449–451(2007), p. 987.
A. Singh, H. Somekawa, and T. Mukai, High temperature processing of Mg-Zn-Y alloys containing quasicrystal phase for high strength, Mater. Sci. Eng. A, 528(2011), No. 21, p. 6647.
A. Singh, Y. Osawa, H. Somekawa, and T. Mukai, Ultra-fine grain size and isotropic very high strength by direct extrusion of chill-cast Mg-Zn-Y alloys containing quasicrystal phase, Scripta Mater., 64(2011), No. 7, p. 661.
S.Q. Luo, A.T. Tang, F.S. Pan, K. Song, and W.Q. Wang, Effect of mole ratio of Y to Zn on phase constituent of Mg-Zn-Zr-Y alloys, Trans. Nonferrous Met. Soc. China, 21(2011), No. 4, p. 795.
M.X. Xia, S. Mitra, B. Dhindaw, G.J. Liu, and Z.Y. Fan, Melt conditioned, high-pressure die casting of Mg-Zn-Y alloy, Metall. Mater. Trans. B, 41(2010), No. 1, p. 209.
E. Mora, G. Garcés, E. Oñorbe, P. Pérez, and P. Adeva, High-strength Mg-Zn-Y alloys produced by powder metallurgy, Scripta Mater., 60(2009), No. 9, p. 776.
B. Chen, C. Lu, D.L. Lin, and X.Q. Zeng, Characterization of microstructure in high strength Mg96Y3Zn1 alloy processed by extrusion and equal channel angular pressing, J. Rare Earths, 29(2011), No. 9, p. 902.
J.S. Zhang, H.W. Du, W. Liang, C.X. Xu, and B.F. Lu, Effect of Mn on the formation of Mg-based spherical icosahedral quasicrystal phase, J. Alloys Compd., 427(2007), No. 1–2, p. 244.
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Zhang, L., Liu, Z. & Mao, Pl. Effect of annealing on the microstructure and mechanical properties of Mg-2.5Zn-0.5Y alloy. Int J Miner Metall Mater 21, 779–784 (2014). https://doi.org/10.1007/s12613-014-0971-0
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DOI: https://doi.org/10.1007/s12613-014-0971-0