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Microstructure evolution and mechanical properties of Mg–10Gd–3Y–xZn–0.6Zr alloys

Published online by Cambridge University Press:  08 May 2018

Zhibing Ding ,
Yuhong Zhao ,
Ruopeng Lu ,
Haixiang Pei  and
Hua Hou
Zhibing Ding
Affiliation:
College of Materials Science and Engineering, North University of China, Taiyuan 030051, China
Yuhong Zhao*
Affiliation:
College of Materials Science and Engineering, North University of China, Taiyuan 030051, China
Ruopeng Lu
Affiliation:
College of Materials Science and Engineering, North University of China, Taiyuan 030051, China
Haixiang Pei
Affiliation:
College of Materials Science and Engineering, North University of China, Taiyuan 030051, China
Hua Hou
Affiliation:
College of Materials Science and Engineering, North University of China, Taiyuan 030051, China
*
a)Address all correspondence to this author. e-mail: zhaoyuhong@nuc.edu.cn
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Abstract

The microstructure evolution and mechanical properties of Mg–10Gd–3Y–xZn–0.6Zr (x = 0.5, 1, and 1.5 wt%) alloys in the as-cast, solution-treated, and peak-aged conditions have been investigated systematically. The results indicate that the microstructure of the as-cast alloy with 0.5% Zn consists of α-Mg, (Mg,Zn)3RE and Mg24(RE,Zn)5 phases, while the alloy with 1.0 and 1.5% Zn consists of α-Mg, (Mg,Zn)3RE and some stacking faults. Moreover, 18R-LPSO phases are observed in the as-cast alloy with 1.5% Zn. The formation of LPSO phases involves not only stacking sequence ordered but also chemical composition ordered. After solution treatment, the Mg24(RE,Zn)5, (Mg,Zn)3RE, stacking faults, and 18R-LPSO phases transform into 14H-LPSO phases. The 14H-LPSO phase plays an important role in the improvement of mechanical properties, especially for the ductility. The β′ phase with a bco structure precipitates in the peak-aged alloys results in precipitation hardening, significantly improving the tensile strength, but it leads to poor ductility.

Keywords

microstructureMgphase transformationmechanical properties
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 12 , 28 June 2018 , pp. 1797 - 1805
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Copyright
Copyright © Materials Research Society 2018 

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References

REFERENCES

Zheng, L., Liu, C.M., Wan, Y.C., Yang, P.W., and Shu, X.: Microstructures and mechanical properties of Mg–10Gd–6Y–2Zn–0.6Zr (wt.%) alloy. J. Alloys Compd. 509, 8832 (2011).Google Scholar
Luo, A.A.: Recent magnesium alloy development for elevated temperature applications. J. Mater. Sci. 1, 2 (2013).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).Google Scholar
Prakash, D.G.L., Regener, D., and Vorster, W.J.J.: Effect of position on the tensile properties in high-pressure die cast Mg alloy. J. Alloys Compd. 470, 111 (2009).Google Scholar
Zhu, S.M., Gibson, M.A., Nie, J.F., Easton, M.A., and Abbott, T.B.: Microstructural analysis of the creep resistance of die-cast Mg–4Al–2RE alloy. Scr. Mater. 58, 477 (2008).CrossRefGoogle Scholar
Wang, J., Meng, J., Zhang, D.P., and Tang, D.X.: Effect of Y for enhanced age hardening response and mechanical properties of Mg–Gd–Y–Zr alloys. Mater. Sci. Eng., A 456, 78 (2007).Google Scholar
Jafari Nodooshan, H.R., Liu, W.C., Wu, G.H., Alizadeh, R., Mahmudi, R., and Ding, W.J.: Microstructure characterization and high-temperature shear strength of the Mg–10Gd–3Y–1.2Zn–0.5Zr alloy in the as-cast and aged conditions. J. Alloys Compd. 619, 826 (2015).CrossRefGoogle Scholar
Matsuda, M., Li, S., and Kawamura, Y.: Variation of long-period stacking order structures in rapidly solidified Mg97Zn1Y2 alloy. Mater. Sci. Eng., A 393, 269 (2005).CrossRefGoogle Scholar
Chino, Y., Mabuchi, M., Hagiwara, S., Iwasaki, H., Yamamoto, A., and Tsubakino, H.: Novel equilibrium two phase Mg alloy with the long-period ordered structure. Scr. Mater. 51, 711 (2004).Google Scholar
Nishida, M., Kawamura, Y., and Yamamuro, T.: Formation process of unique microstructure in rapidly solidified Mg97Zn1Y2 alloy. Mater. Sci. Eng., A 375–377, 1217 (2004).Google Scholar
Kawamura, Y., Hayashi, K., Inoue, A., and Masumoto, T.: Rapidly solidified powder metallurgy Mg97Zn1Y2 alloys with excellent tensile yield strength above 600 MPa. Mater. Trans. 42, 1171 (2001).CrossRefGoogle Scholar
Xu, C., Zheng, M.Y., Xu, S.W., Wu, K., Wang, E.D., Kamado, S., Wang, G.J., and Lv, X.Y.: Ultra high-strength Mg–Gd–Y–Zn–Zr alloy sheets processed by large-strain hot rolling and ageing. Mater. Sci. Eng., A 547, 93 (2012).Google Scholar
Zheng, L., Liu, C.M., and Wang, Y.C.: Microstructures and mechanical properties of Mg–10Gd–6Y–2Zn–0.6Zr (wt.%) alloy. J. Alloys Compd. 509, 8832 (2011).Google Scholar
Suzuki, M., Kimura, T., Koike, J., and Maruyama, K.: Effects of zinc on creep strength and deformation substructures in Mg–Y alloy. Mater. Sci. Eng., A 387–389, 706 (2004).CrossRefGoogle Scholar
Suzuki, M., Kimura, T., Koike, J., and Maruyama, K.: Strengthening effect of Zn in heat resistant Mg–Y–Zn solid solution alloys. Scr. Mater. 48, 997 (2003).CrossRefGoogle Scholar
Liu, H., Bai, J., Yan, K., Yan, J.L., Ma, A.B., and Jiang, J.H.: Comparative studies on evolution behaviors of 14H LPSO precipitates in as-cast and as-extruded Mg–Y–Zn alloys during annealing at 773 K. Mater. Des. 93, 9 (2016).Google Scholar
Zhu, Y.M., Morton, A.J., and Nie, J.F.: The 18R and 14H long-period stacking ordered structures in Mg–Y–Zn alloys. Acta Mater. 58, 2936 (2010).CrossRefGoogle Scholar
Huang, S., Wang, J.F., Hou, F., Huang, X.H., and Pan, F.S.: Effect of Gd and Y contents on the microstructural evolution of long period stacking ordered phase and the corresponding mechanical properties in Mg–Gd–Y–Zn–Mn alloys. Mater. Sci. Eng., A 612, 363 (2014).Google Scholar
Li, Y.L., Wu, G.H., Chen, A.T., Nodooshan, H.R.J., Liu, W.C., Wang, Y.X., and Ding, W.J.: Effects of Gd and Zr additions on the microstructures and high-temperature mechanical behavior of Mg–Gd–Y–Zr magnesium alloys in the product form of a large structural casting. J. Mater. Res. 30, 3461 (2015).Google Scholar
Chen, Q., Shu, D.Y., Zhao, Z.D., Zhao, Z.X., Wang, Y.B., and Yuan, B.G.: Microstructure development and tensile mechanical properties of Mg–Zn–RE–Zr magnesium alloy. Mater. Des. 40, 488 (2012).Google Scholar
Cheng, P., Zhao, Y.H., Lu, R.P., Hou, H., Bu, Z.Q., and Yan, F.: Effect of Ti addition on the microstructure and mechanical properties of cast Mg–Gd–Y–Zn alloys. Mater. Sci. Eng., A 708, 482 (2017).CrossRefGoogle Scholar
Yamasaki, M., Nishijima, M., Sasaki, M., Hiraga, K., and Kawamura, Y.: Formation of 14H long period stacking ordered structure and profuse stacking faults in Mg–Zn–Gd alloys during isothermal aging at high temperature. Acta Mater. 55, 6798 (2007).Google Scholar
Xu, C., Zheng, M.Y., Wu, K., Wang, E.D., Fan, G.H., Xu, S.W., Kamado, S., Liu, X.D., Wang, G.J., and Lv, X.Y.: Effect of cooling rate on the microstructure evolution and mechanical properties of homogenized Mg–Gd–Y–Zn–Zr alloy. Mater. Sci. Eng., A 559, 364 (2013).Google Scholar
Li, M., Zhang, K., Du, Z.W., Li, X.G., Li, Y.J., Ma, M.L., Shi, G.L., Yuan, J.W., Li, T., and Liu, J.B.: The effect of homogenization on microstructures and mechanical properties of Mg–7Gd–3Y–1Nd–xZn–0.5Zr (x = 0.5, 1, and 2 wt%) alloys. Mater. Charact. 109, 66 (2015).Google Scholar
Honma, T., Ohkubo, T., Kamado, S., and Hono, K.: Effect of Zn additions on the agehardening of Mg–2.0Gd–1.2Y–0.2Zr alloys. Acta Mater. 55, 4137 (2007).Google Scholar
Abe, E., Kawamura, Y., Hayashi, K., and Inoue, A.: Long-period ordered structure in a high-strength nanocrystalline Mg–1 at.% Zn–2 at.% Y alloy studied by atomic-resolution-contrast STEM. Acta Mater. 50, 3845 (2002).CrossRefGoogle Scholar
Wu, Y.J., Lin, D.L., Zeng, X.Q., Peng, L.M., and Ding, W.J.: Formation of a lamellar 14H-type long period stacking ordered structure in an as-cast Mg–Gd–Zn–Zr alloy. J. Mater. Sci. 44, 1607 (2009).Google Scholar
Wu, Y.J., Zeng, X.Q., Lin, D.L., Peng, L.M., and Ding, W.J.: The microstructure evolution with lamellar 14H-type LPSO structure in an Mg96.5Gd2.5Zn1 alloy during solid solution heat treatment at 773 K. J. Alloys Compd. 477, 193 (2009).CrossRefGoogle Scholar
Zhang, X.L., Wang, Z.H., Du, W.B., Liu, K., and Li, S.B.: Microstructures and mechanical properties of Mg–13Gd–5Er–1Zn–0.3Zr alloy. Mater. Des. 58, 277 (2014).CrossRefGoogle Scholar
Wang, J.F., Song, P.F., Huang, S., and Pan, F.S.: High-strength and good-ductility Mg–RE–Zn–Mn magnesium alloy with long-period stacking ordered phase. Mater. Lett. 93, 415 (2013).CrossRefGoogle Scholar
Saal, J.E. and Wolverton, C.: Thermodynamic stability of Mg–Y–Zn long-period stacking ordered structures. Scr. Mater. 67, 798 (2012).Google Scholar
Iikubo, S., Matsuda, K., and Ohtani, H.: Phase stability of long-period stacking structures in Mg–Y–Zn: A first-principles study. Phys. Rev. B 86, 054105 (2012).CrossRefGoogle Scholar
Zhu, Y.M., Morton, A.J., and Nie, J.F.: Growth and transformation mechanisms of 18R and 14H in Mg–Y–Zn alloys. Acta Mater. 60, 6562 (2012).Google Scholar
Wang, J., Song, P., Gao, S., Huang, X., Shi, Z., and Pan, F.: Effects of Zn on the microstructure, mechanical properties, and damping capacity of Mg–Zn–Y–Zr alloys. Mater. Sci. Eng., A 528, 5914 (2011).CrossRefGoogle Scholar
Xu, D.K., Liu, L., Xu, Y.B., and Han, E.H.: Effect of microstructure and texture on the mechanical properties of the as-extruded Mg–Zn–Y–Zr alloys. Mater. Sci. Eng., A 443, 248 (2007).Google Scholar
Xu, D.K., Tang, W.N., Liu, L., Xu, Y.B., and Han, E.H.: Effect of W-phase on the mechanical properties of as-cast Mg–Zn–Y–Zr alloys. J. Alloys Compd. 461, 248 (2008).CrossRefGoogle Scholar
Shao, X.H., Yang, Z.Q., and Ma, X.L.: Strengthening and toughening mechanisms in Mg–Zn–Y alloy with a long period stacking ordered structure. Acta Mater. 58, 4760 (2010).Google Scholar
Han, X.Z., Xu, W.C., and Shan, D.B.: Effect of precipitates on microstructures and properties of forged Mg–10Gd–2Y–0.5Zn–0.3Zr alloy during ageing process. J. Alloys Compd. 509, 8625 (2011).Google Scholar
Sundararaman, M., Mukhopadhyay, P., and Banerjee, S.: Deformation behaviour of γ″ strengthened inconel 718. Acta Mater. 36, 847 (1988).Google Scholar