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Atomic-scale observation of β′ and LPSO phase in Mg–Y–Ni alloy by HAADF-STEM

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Abstract

This paper reports on an atomic-scale investigation into the β′ precipitates and the long-period stacking ordered phase (LPSO) in Mg–5Y–2.5Ni–0.5Zr (at.%) alloy, using Cs-corrected high angle annular dark field-scanning transmission electron microscopy (HAADF-STEM). The results displayed that the 18R-type and 14H-type LPSO phases coexisted in the as-cast and the solid solution states, and the 18R-type and 14H-type LPSO structures were thermal stable. After aging treatment, the aging peak hardness reached 138 HV at 225 °C for 48 h. The significant increase in hardness was attributed to the formation of the metastable β′ phase. The lattice parameters of a and b axes for β′ phases are a = 0.65 nm, b = 2.20 nm, and c = 0.52 nm by HAADF-STEM. The interaction between the LPSO phase and the β′ can be found. The atomic-scale interactions between the LPSO and β′ phases are divided into two parts: under-aging and peak-aging conditions between the building blocks.

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References

  1. Z. Leng, J. Zhang, T. Yin, L. Zhang, S. Liu, M. Zhang, and R. Wu: Microstructure and mechanical properties of Mg–9RY–4Cu alloy with long period stacking ordered phase. Mater. Sci. Eng., A 580, 196 (2013).

    Article  CAS  Google Scholar 

  2. T. Itoi, T. Inazawa, M. Yamasaki, Y. Kawamura, and M. Hirohashi: Microstructure and mechanical properties of Mg–Zn–Y alloy sheet prepared by hot-rolling. Mater. Sci. Eng., A 560, 216 (2013).

    Article  CAS  Google Scholar 

  3. J.K. Kim, S. Sandlöbes, and D. Raabe: On the room temperature deformation mechanisms of a Mg–Y–Zn alloy with long-period-stacking-ordered structures. Acta Mater. 82, 414 (2015).

    Article  CAS  Google Scholar 

  4. 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 (2010).

    Article  CAS  Google Scholar 

  5. K. Hagihara, A. Kinoshita, Y. Sugino, M. Yamasaki, Y. Kawamura, H.Y. Yasuda, and Y. Umakoshi: Effect of long-period stacking ordered phase on mechanical properties of Mg97Zn1Y2 extruded alloy. Acta Mater. 58, 6282 (2010).

    Article  CAS  Google Scholar 

  6. J.E. Saal and C. Wolverton: Thermodynamic stability of Mg-based ternary long-period stacking ordered structures. Acta Mater. 68, 325 (2014).

    Article  CAS  Google Scholar 

  7. D. Egusa and E. Abe: The structure of long period stacking/order Mg–Zn–RE phases with extended non-stoichiometry ranges. Acta Mater. 60, 166 (2012).

    Article  CAS  Google Scholar 

  8. D. Qin, J. Wang, Y. Chen, R. Lu, and F. Pan: Effect of long period stacking ordered structure on the damping capacities of Mg–Ni–Y alloys. Mater. Sci. Eng., A 624, 9 (2015).

    Article  CAS  Google Scholar 

  9. S. Wu, J. Zhang, Z. Zhang, C. Xu, K. Nie, and X. Niu: A high strength and good ductility Mg–Y–NI–TI alloy with long period stacking ordered structure processed by hot rolling and aging treatment. Mater. Sci. Eng., A 648, 134 (2015).

    Article  CAS  Google Scholar 

  10. S.M. Zhu, R. Lapovok, J.F. Nie, Y. Estrin, and S.N. Mathaudhu: Microstructure and mechanical properties of LPSO phase dominant Mg85.8Y7.1Zn7.1 and Mg85.8Y7.1Ni7.1 alloys. Mater. Sci. Eng., A 692, 35 (2017).

    Article  CAS  Google Scholar 

  11. T. Itoi, K. Takahashi, H. Moriyama, and M. Hirohashi: A high-strength Mg–Ni–Y alloy sheet with a long-period ordered phase prepared by hot-rolling. Scr. Mater. 59, 1155 (2008).

    Article  CAS  Google Scholar 

  12. J.F. Nie and B.C. Muddle: Characterisation of strengthening precipitate phases in a Mg–Y–Nd alloy. Acta Mater. 48, 1691 (2000).

    Article  CAS  Google Scholar 

  13. S. Liang, D. Guan, X. Tan, L. Chen, and Y. Tang: Effect of isothermal aging on the microstructure and properties of as-cast Mg–Gd–Y–Zr alloy. Mater. Sci. Eng., A 528, 1589 (2011).

    Article  Google Scholar 

  14. P.J. Apps, H. Karimzadeh, J.F. King, and G.W. Lorimer: Precipitation reactions in magnesium-rare earth alloys containing yttrium, gadolinium or dysprosium. Scr. Mater. 48, 1023 (2003).

    Article  CAS  Google Scholar 

  15. K. Liu, L.L. Rokhlin, F.M. Elkin, D. Tang, and J. Meng: Effect of ageing treatment on the microstructures and mechanical properties of the extruded Mg–7Y–4Gd–1.5Zn–0.4Zr alloy. Mater. Sci. Eng., A 527, 828 (2010).

    Article  Google Scholar 

  16. M. Nishijima, K. Hiraga, M. Yamasaki, and Y. Kawamura: Characterization of beta prime phase precipitates in an Mg–5 at.% Gd alloy aged in a peak hardness condition, studied by high-angle annular detector dark-field scanning transmission electron microscopy. Mater. Trans. 47, 2109 (2006).

    Article  CAS  Google Scholar 

  17. M. Nishijima, K. Yubuta, and K. Hiraga: Characterization of beta prime precipitate phase in Mg–2 at.% Y alloy aged to peak hardness condition by high-angle annular detector dark-field scanning transmission electron microscopy (HAADF-STEM). Mater. Trans. 48, 84 (2007).

    Article  CAS  Google Scholar 

  18. Q-Q. Jin, C-F. Fang, and S-B. Mi: Formation of long-period stacking ordered structures in Mg88M5Y7 (M = Ti, Ni and Pb) casting alloys. J. Alloys Compd. 568, 21 (2013).

    Article  CAS  Google Scholar 

  19. M. Jiang, S. Zhang, Y. Bi, H. Li, Y. Ren, and G. Qin: Phase equilibria of the long-period stacking ordered phase in the Mg–Ni–Y system. Intermetallics 57, 127 (2015).

    Article  CAS  Google Scholar 

  20. S-B. Mi and Q-Q. Jin: New polytypes of long-period stacking ordered structures in Mg–Co–Y alloys. Scr. Mater. 68, 635 (2013).

    Article  CAS  Google Scholar 

  21. J.F. Nie, Y.M. Zhu, and A.J. Morton: On the structure, transformation and deformation of long-period stacking ordered phases in Mg–Y–Zn alloys. Metall. Mater. Trans. A 45, 3338 (2014).

    Article  CAS  Google Scholar 

  22. Y.M. Zhu, A.J. Morton, and J.F. Nie: The 18R and 14H long-period stacking ordered structures in Mg–Y–Zn alloys. Acta Mater. 58, 2936 (2010).

    Article  CAS  Google Scholar 

  23. J.K. Kim, W.S. Ko, S. Sandlöbes, M. Heidelmann, B. Grabowski, and D. Raabe: The role of metastable LPSO building block clusters in phase transformations of an Mg–Y–Zn alloy. Acta Mater. 112, 171 (2016).

    Article  CAS  Google Scholar 

  24. Y.J. Wu, C. Xu, F.Y. Zheng, L.M. Peng, Y. Zhang, and W.J. Ding: Formation and characterization of microstructure of as-cast Mg–6Gd–4Y–xZn–0.5Zr (x = 0.3, 0.5, and 0.7 wt%) alloys. Mater. Charact. 79, 93 (2013).

    Article  CAS  Google Scholar 

  25. H. Liu, F. Xue, J. Bai, and J. Zhou: Microstructure and mechanical properties of a Mg94Y4Ni2 alloy with long period stacking ordered structure. J. Mater. Eng. Perform. 22, 3500 (2013).

    Article  CAS  Google Scholar 

  26. H. Liu, F. Xue, J. Bai, J. Zhou, and X. Liu: Effect of substitution of 1 at.% Ni for Zn on the microstructure and mechanical properties of Mg94Y4Zn2 alloy. Mater. Sci. Eng., A 585, 387 (2013).

    Article  CAS  Google Scholar 

  27. Z. Xue, Y. Ren, W. Luo, R. Zheng, and C. Xu: Effect of aging treatment on the precipitation behavior and mechanical properties of Mg–9Gd–3Y–1.5Zn–0.5Zr alloy. J. Mater. Eng. Perform. 26, 5963 (2017).

    Article  CAS  Google Scholar 

  28. Y.X. Li, G.Z. Zhu, D. Qiu, D.D. Yin, Y.H. Rong, and M.X. Zhang: The intrinsic effect of long period stacking ordered phases on mechanical properties in Mg–RE based alloys. J. Alloys Compd. 660, 252 (2016).

    Article  CAS  Google Scholar 

  29. J. Zheng and B. Chen: Interactions between long-period stacking ordered phase and β′ precipitate in Mg–Gd–Y–Zn–Zr alloy: Atomic-scale insights from HAADF-STEM. Mater. Lett. 176, 223 (2016).

    Article  CAS  Google Scholar 

  30. 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 (2012).

    Article  CAS  Google Scholar 

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Acknowledgments

This work is supported by National Key Research and Development Plan (Grant No. 2016YFB0701201).

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Authors and Affiliations

  1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China

    Liping Yu & Xia Chen

  2. Frontier Research Center for Materials Structure, Shanghai Jiao Tong University, Shanghai, 200240, China

    Shaohan Wang & Bin Chen

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  1. Liping Yu
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  2. Xia Chen
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  3. Shaohan Wang
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  4. Bin Chen
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Correspondence to Xia Chen or Bin Chen.

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Yu, L., Chen, X., Wang, S. et al. Atomic-scale observation of β′ and LPSO phase in Mg–Y–Ni alloy by HAADF-STEM. Journal of Materials Research 34, 3545–3553 (2019). https://doi.org/10.1557/jmr.2019.147

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  • DOI: https://doi.org/10.1557/jmr.2019.147

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