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Growth mechanism of an icosahedral quasicrystal and solute partitioning in a Mg-rich Mg–Zn–Y alloy

Published online by Cambridge University Press:  15 April 2014

Jiwei Geng ,
Xinying Teng ,
Guorong Zhou ,
Degang Zhao  and
Jinfeng Leng
Jiwei Geng
Affiliation:
School of Materials Science and Engineering, University of Jinan, Jinan 250022, People's Republic of China
Xinying Teng*
Affiliation:
School of Materials Science and Engineering, University of Jinan, Jinan 250022, People's Republic of China
Guorong Zhou
Affiliation:
School of Materials Science and Engineering, University of Jinan, Jinan 250022, People's Republic of China
Degang Zhao
Affiliation:
School of Materials Science and Engineering, University of Jinan, Jinan 250022, People's Republic of China
Jinfeng Leng
Affiliation:
School of Materials Science and Engineering, University of Jinan, Jinan 250022, People's Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The growth mechanism of an icosahedral quasicrystal and solute partitioning in a Mg-rich Mg–Zn–Y alloy were investigated. It is found that the preferred growth directions of the icosahedral quasicrystalline phase (I-phase) are along 5-fold axes and the planes perpendicular to the 5-fold axes grow in a facet manner. Due to the local compositional change at the solid/liquid interface, the planar growth is gradually replaced by cellular growth. During the nucleation of the primary I-phase, on a microscale, the distribution of the Y element is changed and concentrated along 5-fold directions in the remaining liquid. If the cooling rate is relatively slow, there will be more Y element in the remaining liquid after the formation of the primary I-phase. It causes that (I-phase + α-Mg) eutectic structures form around the primary I-phase. Almost all the Y element is exhausted after this stage. Especially, under a relatively slow cooling rate, the solute partitioning occurs during the growth process of the primary I-phase, which leads to the microshrinkage cavity and crack defects at the edge of the primary I-phase.

Keywords

Mg–Zn–Y alloymicrostructureicosahedral quasicrystalgrowth mechanismsolute partitioning
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 8 , 28 April 2014 , pp. 942 - 949
Copyright
Copyright © Materials Research Society 2014 

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References

REFERENCES

Gröbner, J., Kozlov, A., Fang, X.Y., Geng, J., Nie, J.F., and Schmid-Fetzer, R.: Phase equilibria and transformations in ternary Mg-rich Mg–Y–Zn alloys. Acta Mater. 60, 5948 (2012).CrossRefGoogle Scholar
Farzadfar, S.A., Sanjari, M., Jung, I-H., Essadiqi, E., and Yue, S.: Experimental and calculated phases in two as-cast and annealed Mg–Zn–Y alloys. Mater. Charact. 63, 9 (2012).CrossRefGoogle Scholar
Shechtman, D., Blech, I., Gratias, D., and Cahn, J.W.: Metallic phase with long-range orientational order and no translational symmetry. Phys. Rev. Lett. 53, 1951 (1984).Google Scholar
Luo, Z.P., Zhang, S.Q., Tang, Y.L., and Zhao, D.S.: Quasicrystals in as-cast Mg–Zn–RE alloys. Scripta Metall. Mater. 28, 1513 (1993).Google Scholar
Tsai, A.P., Niikura, A., Inoue, A., and Masumoto, T.: Stoichiometric icosahedral phase in the Zn–Mg–Y system. J. Mater. Res. 12, 1468 (1997).Google Scholar
Tsai, A.P.: Physical properties of quasicrystals (Springer Press, Berlin, Germany, 1999); pp. 35–43.Google Scholar
Hono, K., Mendis, C.L., Sasaki, T.T., and Oh-ishi, K.: Towards the development of heat-treatable high-strength wrought Mg alloys. Scr. Mater. 63, 710 (2010).CrossRefGoogle Scholar
Singh, A., Somekawa, H., and Mukai, T.: High temperature processing of Mg–Zn–Y alloys containing quasicrystal phase for high strength. Mater. Sci. Eng., A 528, 6647 (2011) .Google Scholar
Zhang, J.S., Pei, L.X., Du, H.W., Liang, W., Xu, C.X., and Lu, B.F.: Effect of Mg-based spherical quasicrystals on microstructure and mechanical properties of AZ91 alloys. J. Alloys Compd. 453, 309 (2008).CrossRefGoogle Scholar
Bae, D.H., Kim, S.H., Kim, D.H., and Kim, W.T.: Deformation behavior of Mg–Zn–Y alloys reinforced by icosahedral quasicrystalline particles. Acta Mater. 50, 2343 (2002).Google Scholar
Xu, D.K., Liu, L., Xu, Y.B., and Han, E.H.: The fatigue behavior of I-phase containing as-cast Mg–Zn–Y–Zr alloy. Acta Mater. 56, 985 (2008).Google Scholar
Yuan, G.Y., Kato, H., Amiya, K., and Inoue, A.: Structure and mechanical properties of cast quasicrystal-reinforced Mg–Zn–Al–Y base alloys. J. Mater. Res. 19, 1531 (2004).Google Scholar
Bae, D.H., Lee, M.H., Kim, K.T., Kim, W.T., and Kim, D.H.: Application of quasicrystalline particles as a strengthening phase in Mg–Zn–Y alloys. J. Alloys Compd. 342, 445 (2002).CrossRefGoogle Scholar
Kim, Y.K., Sohn, S.W., Kim, H., Kim, W.T., and Kim, D.H.: Role of icosahedral phase in enhancing the strength of Mg–Sn–Zn–Al alloy. J. Alloys Compd. 549, 46 (2013).Google Scholar
Somekawa, H., Osawa, Y., Singh, A., and Mukai, T.: Rare-earth free wrought-processed magnesium alloy with dispersion of quasicrystal phase. Scr. Mater. 61, 705 (2009).Google Scholar
Singh, A., Watanabe, M., Kato, A., and Tsai, A.P.: Microstructure and strength of quasicrystal containing extruded Mg–Zn–Y alloys for elevated temperature application. Mater. Sci. Eng., A 385, 382 (2004).CrossRefGoogle Scholar
Rosalie, J.M., Somekawa, H., Singh, A., and Mukai, T.: Effect of precipitation on strength and ductility in a Mg–Zn–Y alloy. J. Alloys Compd. 550, 114 (2013).CrossRefGoogle Scholar
Li, C.R., Lu, N.P., Xu, Q., Mei, J., Dong, W.J., Fu, J.L., and Cao, Z.X.: Decahedral and icosahedral twin crystals of silver: Formation and morphology evolution. J. Cryst. Growth 319, 88 (2011).Google Scholar
Niikura, A., Tsai, A.P., Inoue, A., and Masumoto, T.: Stable Zn–Mg–rare–earth face-centered icosahedral alloys with pentagonal dodecahedral solidification morphology. Philos. Mag. Lett. 69, 351 (1994).CrossRefGoogle Scholar
Zhao, D.S., Tang, Y.L., Luo, Z.P., Shen, N.F., Wang, R.H., and Zhang, S.Q.: The face-centered icosahedral quasi-crystalline phase in Mg–Zn–Y–Zr alloys. Mater. Lett. 23, 277 (1995).Google Scholar
Yi, S., Park, E.S., Ok, J.B., Kim, W.T., and Kim, D.H.: (Icosahedral phase + α-Mg) two phase microstructures in the Mg–Zn–Y ternary system. Mater. Sci. Eng., A 300, 312 (2001).Google Scholar
Lngersent, K. and Steinhardt, P.J.: Equilibrium faceting shapes for quasicrystals. Phys. Rev. B 39, 980 (1989).Google Scholar
Dubost, B., Lang, J.M., Tanaka, M., Sainfort, P., and Audier, M.: Large AlCuLi single quasicrystals with triacontahedral solidification morphology. Nature 324, 48 (1986).Google Scholar
Tsai, A.P., Niikura, A., Inoue, A., Masumoto, T., Nishida, Y., Tsuda, K., and Tanaka, M.: Highly ordered structure of icosahedral quasicrystals in Zn–Mg–RE (RE: rare earth element) systems. Philos. Mag. Lett. 70, 169 (1994).Google Scholar
Garg, A. and Levine, D.: Faceting and roughening in quasicrystals. Phys. Rev. Lett. 59, 1683 (1987).Google Scholar
Chattopadhyay, K., Ravishankar, N., and Goswami, R.: Shapes of quasicrystals. Prog. Cryst. Growth Charact. Mater. 34, 237 (1997).Google Scholar
Liu, Y.C., Yang, G.C., Zhou, Y.H., Wang, T., Xu, D.S., and Xu, Q.Y.: Growth mode of decagonal quasicrystal phase in laser resolidified Al72Ni12Co16 alloy. J. Cryst. Growth 207, 292 (1999).Google Scholar
Burton, W.K., Cabrera, N., and Frank, F.C.: The growth of crystals and the equilibrium structure of their surfaces. Philos. Trans. A 243, 299 (1951).Google Scholar
Li, M.R. and Kuo, K.H.: Intermetallic phases and phase reactions in Zn–Mg (<40 at.%)–Y (<20 at.%) region. J. Alloys Compd. 432, 81 (2007).Google Scholar
Ok, J.B., Kim, I.J., Yi, S., Kim, T.W., and Kim, D.H.: Solidification microstructure of as-cast Mg–Zn–Y alloys. Philos. Mag. A 83, 2359 (2003).Google Scholar
Frank, F.C.: Supercooling of liquids. Proc. R. Soc. London Ser. A 215, 43 (1952).Google Scholar
Klein, H., Audier, M., Simonet, V., Hippert, F., and Bellissent, R.: Icosahedral order in a liquid metallic alloy: Molten AlPdMn quasicrystal. Physica B 241–243, 964 (1998).Google Scholar
Holland-Moritz, D., Schroers, J., Herlach, D.M., Grushko, B., and Urban, K.: Undercooling and solidification behaviour of melts of the quasicrystal-forming alloys Al–Cu–Fe and Al–Cu–Co. Acta Mater. 46, 1601 (1998).Google Scholar
Roik, O.S., Galushko, S.M., Samsonnikov, O.V., Kazimirov, V.P., and Sokolskii, V.E.: Structure of liquid Al–Cu–Co alloys near the quasicrystal-forming range. J. Non-Cryst. Solids 357, 1147 (2011).Google Scholar
Geng, J.W., Teng, X.Y., Zhou, G.R., and Zhao, D.G.: Microstructure transformations in the heat-treated Mg–Zn–Y alloy. J. Alloys Compd. 577, 498 (2013).Google Scholar
Tsai, A.P., Inoue, A., and Masumoto, T.: Phason strains on growth, stability and structure of icosahedral phases. Prog. Cryst. Growth Charact. Mater. 34, 221 (1997).Google Scholar
Ohhashi, S., Abe, E., Tanaka, M., and Tsai, M.: Phase formation and structures of quasicrystals and approximants in the Zn–Mg–(Ti, Zr, Hf) system. Acta Mater. 57, 4727 (2009).Google Scholar