Abstract
A comparison of microstructure, mechanical properties and fracture behavior of Mg–9Gd–3Y–x Zn–0.5Zr ( x = 0, 0.2, 0.5, 1.0, and 1.5) (wt%) alloys under different thermal treatment conditions was investigated in this study. The results showed that the as-cast alloys were comprised of Mg matrix, eutectic compounds and cuboid-shaped phases. The eutectics were Mg24(Gd, Y)5 in the alloys of Zn content ≤0.2 wt%, while (Mg, Zn)3RE in the other three alloys. Fine lamellar long period stacking ordered structure formed inside of matrix of the as-cast Zn-containing alloys and its quantity increases with raising Zn content. Mg12(Gd, Y)Zn was observed at grain boundary of Mg matrix after solution treatment in the alloys of Zn content ≥0.5 wt%. Peak-aged Mg–9Gd–3Y–0.5Zn–0.5Zr alloy exhibited a desirable combination of strength and elongation with 244 MPa in yield strength, 371 MPa in ultimate tensile strength and 3.8% in EL. Meanwhile, the fracture behavior of the studied alloys was also investigated.
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B.L. Mordike and T. Ebert: Magnesium: Properties-applications-potential. Mater. Sci. Eng., A 302, 37–45 (2001).
D.J. Li, X.Q. Zeng, J. Dong, and C.Q. Zhai: Influence of heat treatment on microstructure and mechanical properties of Mg–10Gd–3Y–1.2Zn–0.4Zr alloy. Trans. Nonferrous Met. Soc. China 18, 117–121 (2008).
I. Nakatsugawa, S. Kamado, Y. Kojima, R. Ninomiya, and K. Kubota: Corrosion of magnesium alloys containing rare earth elements. Corros. Rev. 16, 139–158 (1998).
A.I. Anthony, S. Kamado, and Y. Kojima: Aging characteristics and high temperature tensile properties of Mg–Gd–Y–Zr alloys. Mater. Trans. 42, 1206–1211 (2001).
S.M. He, X.Q. Zeng, L.M. Peng, X. Gao, J.F. Nie, and W.J. Ding: Precipitation in a Mg–10Gd–3Y–0.4Zr (wt%) alloy during isothermal ageing at 250 °C. J. Alloys Compd. 421, 309–313 (2006).
S.M. He, X.Q. Zeng, L.M. Peng, X. Gao, J.F. Nie, and W.J. Ding: Microstructure and strengthening mechanism of high strength Mg–10Gd–2Y–0.5Zr alloy. J. Alloys Compd. 427, 316–323 (2007).
I.A. Anyanwu, S. Kamado, and Y. Kojima: Platform science and technology for advanced magnesium alloys. Creep properties of Mg–Gd–Y–Zr alloys. Mater. Trans. 42, 1212–1218 (2001).
J. Wang, J. Meng, D. Zhang, and D. Tang: Effect of Y for enhanced age hardening response and mechanical properties of Mg–Gd–Y–Zr alloys. Mater. Sci. Eng., A 456, 78–84 (2007).
M. Sun, G. Wu, W. Wang, and W. Ding: Effect of Zr on the microstructure, mechanical properties and corrosion resistance of Mg–10Gd–3Y magnesium alloy. Mater. Sci. Eng., A 523, 145–151 (2009).
H.R. Jafari Nodooshan, G. Wu, W. Liu, G. Wei, Y. Li, and S. Zhang: Effect of Gd content on high temperature mechanical properties of Mg–Gd–Y–Zr alloy. Mater. Sci. Eng., A 651, 840–847 (2016).
T. Kawabata, K. Matsuda, S. Kamado, Y. Kojima, and S. Ikeno: HRTEM observation of the precipitates in Mg–Gd–Y–Zr alloy. Mater. Sci. Forum 419–422, 303–306 (2003).
H. Zhang, J. Fan, L. Zhang, G. Wu, W. Liu, W. Cui, and S. Feng: Effect of heat treatment on microstructure, mechanical properties and fracture behaviors of sand-cast Mg–4Y–3Nd–1Gd–0.2Zn–0.5Zr alloy. Mater. Sci. Eng., A 677, 411–420 (2016).
Z. Luo, S. Zhang, Y. Tang, and D. Zhao: Microstructures of Mg–Zn–Zr-RE alloys with high RE and low Zn contents. J. Alloys Compd. 209, 275–278 (1994).
T. Honma, T. Ohkubo, S. Kamado, and K. Hono: Effect of Zn additions on the age-hardening of Mg–2.0Gd–1.2Y–0.2Zr alloys. Acta Mater. 55, 4137–4150 (2007).
Y. Kawamura, K. Hayashi, A. Inoue, and T. Masumoto: Rapidly solidified powder metallurgy magnesium alloys with novel mechanical properties. Mater. Sci. Forum 13, 529–534 (2002).
S. Zhang, W. Liu, X. Gu, C. Lu, G. Yuan, and W. Ding: Effect of solid solution and aging treatments on the microstructures evolution and mechanical properties of Mg–14Gd–3Y–1.8Zn–0.5Zr alloy. J. Alloys Compd. 557, 91–97 (2013).
D. Li, X. Zeng, J. Dong, C. Zhai, and W. Ding: Microstructure evolution of Mg–10Gd–3Y–1.2Zn–0.4Zr alloy during heat-treatment at 773 K. J. Alloys Compd. 468, 164–169 (2009).
S. Zhang, G.Y. Yuan, C. Lu, and W.J. Ding: The relationship between (Mg,Zn)3RE phase and 14H-LPSO phase in Mg–Gd–Y–Zn–Zr alloys solidified at different cooling rates. J. Alloys Compd. 509, 3515–3521 (2011).
Y. Gao, Q. Wang, J. Gu, Y. Zhao, Y. Tong, and D. Yin: Comparison of microstructure in Mg–10Y–5Gd–0.5Zr and Mg–10Y–5Gd–2Zn–0.5Zr alloys by conventional casting. J. Alloys Compd. 477, 374–378 (2009).
K. Liu, J. Zhang, G. Su, D. Tang, L.L. Rokhlin, F.M. Elkin, and J. Meng: Influence of Zn content on the microstructure and mechanical properties of extruded Mg–5Y–4Gd–0.4Zr alloy. J. Alloys Compd. 481, 811–818 (2009).
Y.M. Zhu, A.J. Morton, and J.F. Nie: Growth and transformation mechanisms of 18R and 14H in Mg–Y–Zn alloys. Acta Mater. 60, 6562–6572 (2012).
Y. Chino, M. Mabuchi, S. Hagiwara, H. Iwasaki, A. Yamamoto, and H. Tsubakino: Novel equilibrium two phase Mg alloy with the long-period ordered structure. Scr. Mater. 51, 711–714 (2004).
M. Suzuki, T. Kimura, J. Koike, and K. Maruyama: Strengthening effect of Zn in heat resistant Mg–Y–Zn solid solution alloys. Scr. Mater. 48, 997–1002 (2003).
K. Yamada, Y. Okubo, M. Shiono, H. Watanabe, S. Kamado, and Y. Kojima: Alloy development of high toughness Mg–Gd–Y–Zn–Zr alloys. Mater. Trans. 47, 1066–1070 (2006).
S. Huang, J. Wang, F. Hou, X. Huang, and F. Pan: 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, 363–370 (2014).
J.Y. Lee, D.H. Kim, H.K. Lim, and D.H. Kim: Effects of Zn/Y ratio on microstructure and mechanical properties of Mg–Zn–Y alloys. Mater. Lett. 59, 3801–3805 (2005).
Y. Liu, G. Yuan, S. Zhang, X. Zhang, C. Lu, and W. Ding: Effects of Zn/Gd ratio and content of Zn, Gd on phase constitutions of Mg alloys. Mater. Trans. 49, 941–944 (2008).
Z. Su, C. Liu, and Y. Wan: Microstructures and mechanical properties of high performance Mg–4Y–2.4Nd–0.2Zn–0.4Zr alloy. Mater. Des. 45, 466–472 (2013).
Y.H. Kang, D. Wu, R.S. Chen, and E.H. Han: Microstructures and mechanical properties of the age hardened Mg–4.2Y–2.5Nd–1Gd–0.6Zr (WE43) microalloyed with Zn. J. Magnesium Alloys 2, 109–115 (2014).
X.B. Liu, R.S. Chen, and E.H. Han: Effects of ageing treatment on microstructures and properties of Mg–Gd–Y–Zr alloys with and without Zn additions. J. Alloys Compd. 465, 232–238 (2008).
X.H. Shao, Z.Q. Yang, and X.L. Ma: Strengthening and toughening mechanisms in Mg–Zn–Y alloy with a long period stacking ordered structure. Acta Mater. 58, 4760–4771 (2010).
W.J. Ding, Y.J. Wu, L.M. Peng, X.Q. Zeng, G.Y. Yuan, and D.L. Lin: Formation of 14H-type long period stacking ordered structure in the as-cast and solid solution treated Mg–Gd–Zn–Zr alloys. J. Mater. Res. 24, 1842–1854 (2011).
X. Gao, B.C. Muddle, and J.F. Nie: Transmission electron microscopy of Zr–Zn precipitate rods in magnesium alloys containing Zr and Zn. Philos. Mag. Lett. 89, 33–43 (2009).
G. Sha, H.M. Zhu, J.W. Liu, C.P. Luo, Z.W. Liu, and S.P. Ringer: Hydrogen-induced decomposition of Zr-rich cores in an Mg–6Zn–0.6Zr–0.5Cu alloy. Acta Mater. 60, 5615–5625 (2012).
Y.J. Wu, L.M. Peng, X.Q. Zeng, D.L. Lin, and W.J. Ding: Formation of a novel X Phase in Mg–Gd–Zn–Zr alloy. Mater. Sci. Forum 654–656, 623–626 (2010).
A. Datta, U.V. Waghmare, and U. Ramamurty: Structure and stacking faults in layered Mg–Zn–Y alloys: A first-principles study. Acta Mater. 56, 2531–2539 (2008).
M. Suzuki, T. Kimura, J. Koike, and K. Maruyama: Effects of zinc on creep strength and deformation substructures in Mg–Y alloy. Mater. Sci. Eng., A 387–389, 706–709 (2004).
L. Gao, R.s. Chen, and E.h. Han: Fracture behavior of high strength Mg–Gd–Y–Zr magnesium alloy. Trans. Nonferrous Met. Soc. China 20, 1217–1221 (2010).
ACKNOWLEDGMENTS
This work is supported by National Key Research and Development Program of China (No. 2016YFB0701205), National Natural Science Foundation of China (No. 51771115), Science Innovation Foundation of Shanghai Academy of Spaceflight Technology (Nos. SAST2015047 and SAST2016048), and Research Program of Joint Research Center of Advanced Spaceflight Technologies (Nos. USCAST2015-25 and USCAST2016-18).
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Cui, W., Xiao, L., Liu, W. et al. Effect of Zn addition on microstructure and mechanical properties of Mg–9Gd–3Y–0.5Zr alloy. Journal of Materials Research 33, 733–744 (2018). https://doi.org/10.1557/jmr.2017.458
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DOI: https://doi.org/10.1557/jmr.2017.458