Abstract
Mg-6Zn-xCe (x = 0, 0.6, 1.0, 2.0) alloy ingots with diameter of 50 mm were extruded into bars with diameter of 12 mm at 300 °C. The microstructures were analyzed by X-ray diffraction, optical microscopy, scanning electron microscopy and transmission electron microscopy, and mechanical properties were tested at room temperature. The results showed that major intermetallic composition in as-cast Mg-6Zn and Mg-6Zn-0.6Ce alloys was Mg4Zn7 phase, during extrusion Mg4Zn7 phase was dissolved into matrix and then precipitated as MgZn2. In as-cast and as-extruded Mg-6Zn-1Ce and Mg-6Zn-2Ce alloys the major intermetallic composition was T phase. The microstructure of as-extruded alloy was refined due to complete dynamic recrystallization, the average grain size decreased with increasing Ce content, which were 12.1, 11.7, 11.0 and 10.0 mm, respectively. High density MgZn2 precipitated in Mg-6Zn and Mg-6Zn-0.6Ce alloys. The broken T phase particles were distributed linearly along extrusion direction. Mg-6Zn-0.6Ce alloy exhibited a high yield strength of 226.3 MPa that was about 24 MPa higher than Mg-6Zn alloy. However, with increasing Ce contents, the strengths were decreased slightly because the effects of precipitation strengthening of MgZn2 and solid solute strengthening of Zn were weakened though the strengthening effect of T phase was enhanced.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Arruebarrena G, Hurtado I, VÄINÖLÄ J, et al. Development of Investment–Casting Process of Mg–Alloys for Aerospace Applications[J]. Adv. Eng. Mater., 2007, 9(9): 751–756
Buha J. Reduced Temperature(22–100) Ageing of an Mg–Zn Alloy[ J]. Mater. Sci. Eng. A, 2008, 492(1–2): 11–19
Buha J. The Effect of Ba on the Microstructure and Age Hardening of an Mg–Zn Alloy[J]. Mater. Sci. Eng. A, 2008, 491(1–2): 70–79
Kevorkov D, Pekguleryuz M. Experimental Study of the Ce–Mg–Zn Phase Diagram at 350 °C via Diffusion Couple Techniques[J]. J. Alloys and Comp., 2009, 478(1–2): 427–436
Yang W P, Guo X F. A High Strength Mg–6Zn–1Y–1Ce Alloy Prepared by Hot Extrusion[J]. J. Wuhan Univ. of Tech., 2013, 28(2): 389–395
Yang W P, Guo X F. High Strength Magnesium Alloy with α–Mg and W–phase Processed by Hot Extrusion[J]. Tran. Nonferr. Metals Soc. China, 2011, 21(11): 2 358–2 364
Yi D, Wang B, Fang X, et al. Effect of Rare–Earth Elements Y and Ce on the Microstructure and Mechanical Properties of ZK60 Alloy[J]. Mater. Sci. Forum, 2005, 488–489: 103–106
Mishra R K, Gupta A K, Rao P R, et al. Influence of Cerium on the Texture and Ductility of Magnesium Extrusions[J]. Scripta Mater., 2008, 59(5): 562–565
Luo A A, Mishra R K, Sachdev A K. High–Ductility Magnesium–Zinc–Cerium Extrusion Alloys[J]. Scripta Mater., 2011, 64(5): 410–413
Cai J, Ma G C, Liu Z, et al. Influence of Rapid Solidification on the Mechanical Properties of Mg–Zn–Ce–Ag Magnesium Alloy[J]. Mater. Sci. Eng. A, 2007, 456(1–2): 364–367
Chino Y, Sassa K, Mabuchi M. Texture and Stretch Formability of Mg–1.5 mass %Zn–0.2 mass % Ce Alloy Rolled at Different Rolling Temperatures[ J]. Mater. Tran., 2008, 49(12): 2 916–2 918
Zhou T, Xia H, Chen Z H. Effect of Ce on Microstructures and Mechanical Properties of Rapidly Solidified Mg–Zn Alloy[J]. Mater. Sci. Tech., 2011, 27(7): 1 198–1 205
Okamoto H. Comment on Mg–Zn(Magnesium–Zinc)[J]. J. Phase Equilibria, 1994, 15(1): 129–130
Alizadeh R, Mahumudi R, Langdon T. Creep Mechanisms in an Mg–4Zn Alloy in the As–cast and Aged Conditions[J]. Mater. Sci. Eng. A, 2013, 564: 423–430
Gao X, Nie J F. Characterization of Strengthening Precipitate Phases in a Mg–Zn Alloy[J]. Scripta Mater., 2007, 56(8): 645–648
Wei L Y, Dunlop G L, Westengen H. The Intergranular Microstructure of Cast Mg–Zn and Mg–Zn–Rare Earth Alloys[J]. Metall. Mater. Tran. A, 1995, 26(8): 1 947–1 955
Wei L Y, Dunlop G L, Westengen H. Solidification Behaviour and Phase Constituents of Cast Mg–Zn–Misch Metal Alloys[J]. J. Mater. Sci., 1997, 32(12): 3 335–3 340
Yang W P, Guo X F, Lu Z X. Crystal Structure of the Ternary Mg–Zn–Ce Phase in Rapidly Solidified Mg–6Zn–1Y–1Ce Alloy[J]. J. Alloys Comp., 2012, 521: 1–3
Buha J. Grain Refinement and Improved Age Hardening of Mg–Zn Alloy by a Trace Amount of V[J]. Acta Mater., 2008, 56(14): 3 533–3 542
Rosalie J M, Somekawa H, Singh A, et al. Structural Relationships among MgZn2 and Mg4Zn7 Phases and Transition Structures in Mg–Zn–Y Alloys[J]. Philos. Mag., 2010, 90(24): 3 355–3 374
Singh A, Tsai A P. Structural Characteristics of β1' Precipitates in Mg–Zn–Based Alloys[J]. Scripta Mater., 2007, 57(10): 941–944
He S M, Peng L M, Zeng X Q, et al. Comparison of the Microstructure and Mechanical Properties of a ZK60 Alloy with and without 1.3 wt% Gadolinium Addition[J]. Mater. Sci. Eng. A, 2006, 433(1–2): 175–181
Yang W P, Guo X F, Yang K J. Low Temperature Quasi–Superplasticity of ZK60 Alloy Prepared by Reciprocating Extrusion[J]. Tran. Nonferr. Metals Soc. China, 2012, 22(2): 255–261
Chino Y, Huang X, Suzuki K, et al. Influence of Zn Concentration on Stretch Formability at Room Temperature of Mg–Zn–Ce Alloy[J]. Mater. Sci. Eng. A, 2010, 528(2): 566–572
Author information
Authors and Affiliations
Corresponding author
Additional information
Funded by the National Natural Science Foundation of China (No.51571086), China Postdoctoral Science Foundation (No. 2013M541973), The Research Fund for Doctoral Program of Henan Polytechnic University (No. B2015-14)
Rights and permissions
About this article
Cite this article
Yu, H., Yang, W., Cui, H. et al. Microstructures and Tensile Properties of Hot-extruded Mg-6Zn-xCe (x=0, 0.6, 1.0, 2.0) Alloys. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 34, 150–155 (2019). https://doi.org/10.1007/s11595-019-2029-7
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11595-019-2029-7