Abstract
Aging heat treatments of an extruded Mg-9Gd-3Y-1.5Zn-0.5Zr (wt.%) alloy at 200, 225, and 250 °C for various times were studied. The results show that dynamic recrystallization (DRX) occurred during the extrusion process and the alloy exhibited a significant aging hardening response at temperatures ranging from 200 to 225 °C. The precipitation sequence of the alloy at 225 °C was supersaturated solid solution (SSSS) → β″ (D019, Mg3RE) → β′ (bco, Mg15RE3), where the β′ phase was the primary precipitated phase. A large amount of discontinuous lamellar-shaped 14H-structure long period stacking ordered (LPSO) phase was also observed in the α-Mg matrix before and after aging treatments. Owing to the combined strengthening effect of fine DRXed grains, β′ nanoparticles, and widespread LPSO phases, the ultimate tensile strength and tensile yield strength of the peak-aged extruded alloy reached 409 and 303 MPa, respectively. The elongation in this circumstance was ~7.1%, which was slightly lower than that of the alloy before aging treatment.
Similar content being viewed by others
References
Y. Kawamura, K. Hayashi, A. Inoue, and T. Masumoto, Rapidly Solidified Powder Metallurgy Mg97Zn1Y2 Alloys with Excellent Tensile Yield Strength above 600 MPa, Mater. Trans., 2001, 42(7), p 1172–1176
Q. Wang, J. Chen, Z. Zhao, and S.M. He, Microstructure and Super High Strength of Cast Mg-8.5Gd-2.3Y-1.8Ag-0.4Zr Alloy, Mater. Sci. Eng. A, 2010, 528, p 323–328
Y.K. Kim, S.W. Sohn, D.H. Kim, W.T. Kim, and D.H. Kim, Role of Icosahedral Phase in Enhancing the Strength of Mg-Sn-Zn-Al Alloy, J. Alloys Compd., 2013, 549, p 46–50
L.L. Rohklin and N.I. Nikitina, Magnesium-Gadolinium and Magnesium Gadolinium-Yttrium Alloys, Z. Metallkd., 1994, 85, p 819–823
X. Li, W. Qi, K. Zheng, and N. Zhou, Enhanced Strength and Ductility of Mg-Gd-Y-Zr Alloys by Secondary Extrusion, J. Magnes. Alloys, 2013, 1, p 54–63
C. Xu, M.Y. Zheng, K. Wu, E.D. Wang, G.H. Fan, S.W. Xu, S. Kamado, X.D. Liu, and G.J. Wang, Effect of Aging Treatment on the Precipitation Behavior of Mg-Gd-Y-Zn-Zr Alloy, J. Alloys Compd., 2013, 550, p 50–56
D. Griffiths, Explaining Texture Weakening and Improved Formability in Magnesium Rare Earth Alloys, Mater. Sci. Technol., 2015, 31(1), p 10–24
M. Yamasaki, T. Anan, S. Yoshimoto, and Y. Kawamura, Mechanical Properties of Warm-Extruded Mg–Zn–Gd Alloy with Coherent 14H Long Periodic Stacking Ordered Structure Precipitate, Scripta Mater., 2005, 53, p 799–803
Z. Yang, J.P. Li, Y.C. Guo, T. Liu, F. **a, Z.W. Zeng, and M.X. Liang, Precipitation Process and Effect on Mechanical Properties of Mg-9Gd-3Y-0.6Zn-0.5Zr Alloy, Mater. Sci. Eng. A, 2007, 454–455, p 274–280
S. Yoshimoto, M. Yamasaki, and Y. Kawamura, Microstructure and Mechanical Properties of Extruded Mg-Zn-Y Alloys with 14H Long Period Ordered Structure, Mater. Trans., 2006, 47, p 959–965
W.Y. Wang, S.L. Shang, Y. Wang, K.A. Darling, L.J. Kecskes, S.N. Mathaudhu, X.D. Hui, and Z.K. Liu, Electronic Structures of Long Periodic Stacking Order Structures in Mg: A First-Principles Study, J. Alloys Compd., 2014, 586, p 656–662
X. Liu, Q.C. Le, Z.Q. Zhang, L. Bao, Z.X. Fan, and J.Z. Cui, Effects of Casting Process on Microstructures and Flow Stress Behavior of Mg-9Gd-3Y-1.5Zn-0.8Zr, J. Magnes. Alloys, 2014, 2, p 342–348
C. Xu, M.Y. Zheng, K. Wu, E.D. Wang, G.H. Fan, S.W. Xu, S. Kamado, X.D. Liu, G.J. Wang, and X.Y. Lv, Effect of Cooling Rate on the Microstructure Evolution and Mechanical Properties of Homogenized Mg-Gd-Y-Zn-Zr Alloy, Mater. Sci. Eng. A, 2013, 559, p 364–370
M. Yamasaki, K. Hagihara, S. Inoue, J.P. Hadorn, and Y. Kawamura, Crystallographic Classification of Kink Bands in an Extruded Mg-Zn-Y Alloy Using Intragranular Misorientation Axis Analysis, Acta Mater., 2013, 61, p 2065–2076
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 Alloy, Acta Mater., 2007, 55, p 4137–4150
J.F. Nie, Y.M. Zhu, and A.J. Morton, On the Structure, Transformation and Deformation of Long-Period Stacking Ordered Phase in Mg-Y-Zn Alloys, Met. Mater. Trans. A, 2014, 45A, p 3338–3348
F.M. Lu, A.B. Ma, J.H. Jiang, D.H. Yang, and Q. Zhou, Review on Long-Period Stacking-Ordered Structures in Mg-Zn-RE Alloys, Rare Met., 2012, 31(3), p 303–310
T. Honma, T. Ohkubo, and K. Hono, Chemistry of Nanoscale Precipitates in Mg-2.1Gd-0.6Y-0.2Zr (at.%) Alloy Investigated by the Atom Probe Technique, Mater. Sci. Eng. A, 2005, 395, p 301–306
Z.Q. Wang, B. Zhang, D.J. Li, R. Fritsch, X.Q. Zeng, H.J. Roven, and W.J. Ding, Effect of Heat Treatment on Microstructures and Mechanical Properties of High Vacuum Die Casting Mg-8Gd-3Y-0.4Zr Magnesium Alloy, Trans. Nonferr. Met. Soc. China, 2014, 24, p 3762–3768
J.H. Li, J. Barrirero, G. Sha, H. Aboulfadl, F. Muchlich, and P. Schumacher, Precipitation Hardening of an Mg-5Zn-2Gd-0.4Zr (wt.%) Alloy, Acta Mater., 2016, 108, p 207–218
J.F. Nie, Precipitation and Hardening in Magnesium alloys, Met. Mater. Trans. A, 2012, 43A, p 3891–3939
C. Xu, M.Y. Zheng, K. Wu, E.D. Wang, G.H. Fan, S.W. Xu, S. Kamado, X.D. Liu, G.J. Wang, and X.Y. Lv, Influence of Rolling Temperature on the Microstructure and Mechanical Properties of Mg-Gd-Y-Zn-Zr Alloy Sheets, Mater. Sci. Eng. A, 2013, 559, p 615–622
C. Antion, P. Donnadieu, F. Perrard, A. Deschamps, C. Tassin, and A. Pisch, Hardening Precipitation in a Mg-4Y-3RE Alloy, Acta Mater., 2003, 51, p 5335–5348
Acknowledgments
This work is supported by the Program for New Century Excellent Talents in University (NCET-12-0849) and the Fundamental Research Funds for the Central Universities (2014ZZD03) and Youth Science Fund Project of National Natural Science Fund of China (51401070).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Xue, Z., Ren, Y., Luo, W. et al. Effect of Aging Treatment on the Precipitation Behavior and Mechanical Properties of Mg-9Gd-3Y-1.5Zn-0.5Zr Alloy. J. of Materi Eng and Perform 26, 5963–5972 (2017). https://doi.org/10.1007/s11665-017-2755-y
Received:
Revised:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11665-017-2755-y