Hostname: page-component-78c5997874-m6dg7 Total loading time: 0 Render date: 2024-11-14T17:24:41.120Z Has data issue: false hasContentIssue false
  • English
  • Français

Effect of cooling rates on solidification and microstructure of rapidly solidified Mg57Zn37Y6 quasicrystal alloy

Published online by Cambridge University Press:  28 September 2015

Min Xu ,
Xinying Teng  and
Jiwei Geng
Min Xu
Affiliation:
School of Materials Science and Engineering, University of Jinan, Jinan 250022, Shandong Province, People's Republic of China
Xinying Teng*
Affiliation:
School of Materials Science and Engineering, University of Jinan, Jinan 250022, Shandong Province, People's Republic of China
Jiwei Geng
Affiliation:
State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
Get access

Abstract

The influence of cooling rates on the solidification and microstructure of rapidly solidified quasicrystal alloys with a nominal compositions of Mg57Zn37Y6 (at.%) prepared by melt spinning method was investigated. The microstructure, phase constitution, phase transition, and phase structure of the alloys were examined by means of scanning electron microscopy, x-ray diffraction, energy dispersive spectrometer, differential scanning calorimetry, and transmission electron microscopy. The results show that rapid solidification refines and homogenizes the microstructure of Mg57Zn37Y6 alloys, compared to the conventionally-cast master alloy. With the increasing cooling rate of rapid solidification, the thickness of the ribbon decreases greatly and a larger amount of I-phase can be formed. α-Mg, MgZn, and icosahedral phases are found in the as-cast alloy, but the MgZn phase is absent from rapidly solidified alloys. The I-phase in both as-cast and rapidly solidified alloys can precipitate directly from the melt during the solidification process. A higher cooling rate can lead to a large degree of supercooling, resulting in a decreased phase transition temperature and a large number of icosahedral short-range orders (ISROs). ISROs can act as templates in liquid and promote the nucleation of I-phase.

Keywords

Mg57Zn37Y6 alloysquasicrystalscooling raterapid solidificationphase transition
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 21 , 13 November 2015 , pp. 3324 - 3330
Copyright
Copyright © Materials Research Society 2015 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Footnotes

Contributing Editor: Yang-T. Cheng

References

REFERENCES

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).Google 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. Scr. 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
Wollgarten, M., Beyss, M., and Urban, K.: Direct evidence for plastic deformation of quasicrystals by means of a dislocation mechanism. Phys. Rev. Lett. 71, 549 (1993).Google Scholar
Takeuchi, S., Iwanaga, H., and Shibuya, T.: Hardness of quasicrystals. Jpn. J. Appl. Phys. 30, 561 (1991).Google Scholar
Dubois, J.M., Kang, S.S., and von Stebut, J.: Quasicrystalline low-friction coatings. J. Mater. Sci. Lett. 10, 537 (1991).Google Scholar
Yoshida, T., Itoh, K., Tamura, R., and Takeuchi, S.: Plastic deformation and hardness in Mg-Zn-(Y, Ho) icosahedral quasicrystals. Mater. Sci. Eng., A 786, 294 (2000).Google Scholar
Yang, W., Liu, F., Wang, H.F., Lu, B.P., and Yang, G.C.: Non-equilibrium transformation kinetics and primary grain size distribution in the rapid solidification of Fe–B hypereutectic alloy. J. Alloys Compd. 509(6), 2903 (2011).Google Scholar
Lavernia, E.J. and Srivatsan, T.S.: The rapid solidification processing of materials: Science, principles, technology, advances, and applications. J. Mater. Sci. 45(2), 287 (2010).CrossRefGoogle Scholar
Gogebakan, M., Uzun, O., Karaaslan, T., and Keskin, M.: Rapidly solidified Al-6.5 wt.% Ni alloy. J. Mater. Process. Technol. 142(1), 87 (2003).Google Scholar
Guo, X.F. and Shechtman, D.: Extruded high-strength solid materials based on magnesium with zinc, yttrium, and cerium additives. Glass Phys. Chem. 31(1), 44 (2005).Google Scholar
Lee, S.W., Wang, H.Y., Chen, Y.L., Yeh, J.W., and Yang, C.F.: An Mg–Al–Zn alloy with very high specific strength and superior high-strain-rate superplasticity processed by reciprocating extrusion. Adv. Eng. Mater. 6(12), 948 (2004).Google Scholar
Wan, D.Q., Yang, G.C., Lin, L., and Feng, Z.G.: Equilibrium and non-equilibrium microstructures of Mg–Zn–Y quasicrystal alloy. Mater. Lett. 62, 1711 (2008).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
Zhang, Z.M., Xu, C.J., and Guo, X.F.: Microstructure of Mg-6.4Zn-1.1Y alloy fabrication by rapid solidification and reciprocating extrusion. Acta Metall. Sin. (Engl. Lett.) 21, 30 (2008).Google Scholar
Liu, Z.G., Chai, L.H., and Chen, Y.Y.: Effect of cooling rate and Y element on the microstructure of rapidly solidified TiAl alloys. J. Alloys Compd. 504, 491 (2010).Google Scholar
Geng, J.W., Teng, X.Y., Zhou, G.R., and Zhao, Z.W.: Solidification and microstructure of as-cast Mg65Zn32Y3 quasicrystal alloy. Phys. B 420, 64 (2013).Google 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
Taha, M.A.: Geometry of melt-spun ribbons. Mater. Sci. Eng., A 134, 1162 (1991).Google Scholar
Cantor, B., Kim, W.T., Bewlay, B.P., and Gillen, A.G.: Microstructure-cooling rate correlations in melt-spun alloys. J. Mater. Sci. 26(5), 1266 (1991).Google Scholar
Gillen, A.G. and Cantor, B.: Photocalorimetric cooling rate measurements on a Ni-5wt.% Al alloy rapidly solidified by melt spinning. Acta Metall. 33(10), 1813 (1985).Google Scholar
Liu, G., Zhang, Z.Z., Chen, Q., Zhang, H., Yin, C.H., and Zhang, S.M.: Microstructures and properties of rapidly solidified Mg–Zn–Y–Zr alloy ribbons. Mater. Eng. 9, 38 (2009). [In Chinese].Google Scholar
Geng, J.W., Teng, X.Y., Zhou, G.R., Zhao, D.G., and Leng, J.F.: Growth mechanism of an icosahedral quasicrystal and solute partitioning in a Mg-rich Mg–Zn–Y alloy. J. Mater. Res. 29, 942 (2014).Google Scholar
Shi, F., Guo, X.F., and Zhang, Z.M.: Study on the quasicrytal phase in Mg74Zn25Y1 alloy. Chin. J. Mech. Eng. 39(8), 138 (2003).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
Ranganathan, S. and Inoue, A.: An application of Pettifor structure maps for the identification of pseudo-binary quasicrystalline intermetallics. Acta Mater. 54, 3647 (2006).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
Klein, H., Audier, M., Simonet, V., Hippert, F., and Bellissent, R.: Icosahedral order in a liquid metallic alloy: Molten AlPdMn quasicrystal. Phys. B 964, 241 (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(5), 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.: Temperature dependence of the electrical resistivity of Mg–Zn–Y quasicrystal alloy. Mater. Lett. 132, 334 (2014).Google Scholar
Ye, S.L., Li, X.Y., Bian, X.F., Wang, W.M., and Yin, L.J.: Remelting treatment and heredity phenomenon in the formation of Fe78Si9B13 amorphous alloy. J. Alloys Compd. 562, 143 (2013).Google Scholar
Dmitrienko, V.E., Astaf’ev, S.B., and Kléman, M.: Growth, melting, and clustering of icosahedral quasicrystals: Monte Carlo simulations. Mater. Sci. Eng., A 294–296, 413 (2000).Google Scholar
Egami, T.: Icosahedral order in liquids. J. Non-Cryst. Solids 353, 3666 (2007).Google Scholar