In this study, the effects of Sm on the microstructure and corrosion resistance of hot-extruded AZ61 magnesium alloys were investigated by optical microscopy, scanning electron microscopy, and transmission electron microscopy. The results showed that uniformly dispersed Al2Sm particles with size of ∼2 µm were discovered in the hot-extruded AZ61 magnesium alloy sample modified with 1.0 wt% Sm, which promoted dynamic recrystallization grain growth during the hot-extruded process, gradually increasing the grain of the alloy as Sm content increased. The morphology of the corroded surface and the corrosion rate of the hot-extruded AZ61 magnesium alloy both were significantly improved after Sm addition. The alloy sample modified with 2.0 wt% Sm after immersion in 3.5 wt% NaCl solution for 12 h showed minimum corrosion rate value, 3.1 mg/cm2 day, which is only 3.7% of the corrosion rate of unmodified alloy (82 mg/cm2 day).
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M.L. Olguín-González, D. Hernández-Silva, M.A. García-Berna, and V.M. Sauce-Range: Hot deformation behavior of hot-rolled AZ31 and AZ61 magnesium alloys. Mater. Sci. Eng., A 82, 597 (2014).
L.R. Krishna, G. Poshal, A. Jyothirmayi, and G. Sundararajan: Relative hardness and corrosion behavior of micro arc oxidation coatings deposited on binary and ternary magnesium alloys. Mater. Des. 77, 6–14 (2015).
A. Atrens, G.L. Song, M. Liu, Z. Shi, F. Cao, and M.S. Dargusch: Review of recent developments in the field of magnesium corrosion. Adv. Eng. Mater. 17, 400 (2015).
A. Atrens, G.L. Song, F. Cao, Z. Shi, and P.K. Bowen: Advances in Mg corrosion and research suggestions. J. Magnesium Alloys 1, 177 (2013).
S.M. Jo, K.C. Park, H.B. Kim, H. Kimura, S.K. Park, and Y.H. Park: Investigation on the microstructure and mechanical properties of Mg-Al-Yb alloys. Mater. Trans. 52, 1088 (2011).
S. Ohhashi, K. Suzuki, A. Kato, and A.P. Tsai: Phase formation and stability of quasicrystal/α-Mg interfaces in the Mg-Cd-Yb system. Acta Mater. 68, 116 (2014).
Q.A. Li, X.F. Li, Q. Zhang, and J. Chen: Effect of rare-earth element Sm on the corrosion behavior of Mg-6Al-1.2Y-0.9Nd alloy. Rare Met. 6, 557 (2010).
W.X. Huang and H. Yan: Preparation and theoretic study of semi-solid Al2Y/AZ91 magnesium matrix composites slurry by ultrasonic vibration source. J. Rare Earths 32, 573 (2014).
J.L. Zhang, Y.L. Liu, J. Zhou, Z.Y. Feng, and S.B. Wang: Kinetic study on the corrosion behavior of AM60 magnesium alloy with different Nd contents. J. Alloys Compd. 629, 290 (2015).
S. Sankaranarayanan, B. Carsten, M.N. Baoshu, L.E.W. Wai, S.G. Chwee, H. Norbert, and G. Manoj: Effect of erbium modification on the microstructure, mechanical and corrosion characteristics of binary Mg-Al alloys. J. Alloys Compd. 648, 759 (2015).
X.M. Cui, P.C. Bai, X.H. Hou, W. Liu, and L.Y. Wang: Effect of erbium addition on microstructure and corrosion resistance of AZ91 magnesium alloy. Chin. Rare Earths 36, 110 (2015).
R.L. Jia, M. Zhang, L.N. Zhang, W. Zhang, and F. Guo: Correlative change of corrosion behavior with the microstructure of AZ91 Mg alloy modified with Y additions. J. Alloys Compd. 634, 263 (2015).
W.H. Jin, G.S. Guo, H.Q. Feng, W.H. Wang, X.M. Zhang, and P.K. Chu: Improvement of corrosion resistance and biocompatibility of rare-earth WE43 magnesium alloy by neodymium self-ion implantation. Corros. Sci. 94, 142 (2015).
A.M. Zhang, H. Hao, X.T. Liu, and X.G. Zhang: Effects of precipitates on grain size and mechanical properties of AZ31-x%Nd magnesium alloy. J. Rare Earths 32, 451 (2014).
W.J. Liu, F.H. Cao, L.R. Chang, Z. Zhang, and J.Q. Zhang: Effect of rare earth element Ce and La on corrosion behavior of AM60 magnesium alloy. Corros. Sci. 51, 1334 (2009).
C.C. Jain and C.H. Koo: Creep and corrosion properties of the extruded magnesium alloy containing rare earth. Mater. Trans. 48, 265 (2007).
D.G. Wu, S.H. Yan, Z.Q. Wang, Z.Q. Zhang, R.Y. Miao, X.W. Zhang, and D.H. Chen: Effect of samarium on microstructure and corrosion resistance of aged as-cast AZ92 magnesium alloy. J. Rare Earths 32, 663 (2014).
Z.H. Huang, W.J. Qi, J. Xu, and C. Cai: Microstructures and mechanical properties of Mg-Al-Sm series heat-resistant magnesium alloys. Trans. Nonferrous Met. Soc. China 25, 22 (2015).
M. Sun, X.Y. Hu, L.M. Peng, P.H. Fu, and Y.H. Peng: Effects of Sm on the grain refinement, microstructures and mechanical properties of AZ31 magnesium alloy. Mater. Sci. Eng., A 620, 89 (2014).
C.L. Wang, J.C. Dai, W.C. Liu, L. Zhang, and G.H. Wu: Effect of Al additions on grain refinement and mechanical properties of Mg-Sm alloys. J. Alloys Compd. 620, 172 (2015).
S.H. Hou and R.E. Napolitano: Modeling of thermodynamic properties and phase equilibria for the Al-Sm binary system. Metall. Mater. Trans. A 39, 502 (2008).
C.P. Wang, H.L. Zhang, S.L. Wang, Z. Lin, X.J. Liu, A.T. Tang, and F.S. Pan: Thermodynamic assessments of the Mn-Sm and Mn-Ho systems. J. Alloys Compd. 481, 291 (2009).
J. Kim and I.H. Jung: Critical systematic evaluation and thermodynamic optimization of the Mn-RE system: RE = La, Ce, Pr, Nd and Sm. J. Alloys Compd. 525, 191 (2012).
H.T. Son, J.S. Lee, D.G. Kim, K. Yoshimi, and K. Maruyama: Microstructure and dynamic ultra-micro hardness of the as-cast and extruded Mg-Al-Ca-Sm alloys. Adv. Mater. Res. 24–25, 153 (2007).
A. Saccone, G. Cacciamani, D. Maccio, G. Borzone, and R. Ferro: Contribution to the study of the alloys and intermetallic compounds of aluminium with the rare-earth metals. Intermetallics 6, 201 (1998).
H.T. Son, J.S. Lee, and D.G. Kim: Effects of samarium (Sm) additions on the microstructure and mechanical properties of as-cast and hot-extruded Mg-5 wt%Al-3 wt%Ca-based alloys. J. Alloys Compd. 473, 446 (2009).
J.L. Wang, L.D. Wang, Y.M. Wu, and L.M. Wang: Effects of samarium on microstructures and tensile properties of Mg-5Al-0.3Mn alloy. Mater. Sci. Eng., A 528, 4115 (2011).
H.Y. Wu, J.C. Yang, J.H. Liao, and F.J. Zhu: Dynamic behavior of extruded AZ61 Mg alloy during hot compression. Mater. Sci. Eng., A 535, 68 (2012).
T. Zhang, G.Z. Meng, Y.W. Shao, Z.Y. Cui, and F.H. Wang: Corrosion of hot extrusion AZ91 magnesium alloy. Part II: Effect of rare earth element neodymium (Nd) on the corrosion behavior of extruded alloy. Corros. Sci. 53, 2934 (2011).
S.J. Zhu, Z.D. Liu, R.X. Qu, L.G. Wang, Q.K. Li, and S.K. Guan: Effect of rare earth and Mn elements on the corrosion behavior of extruded AZ61 system in 3.5 wt% NaCl solution and salt spray test. J. Magnesium Alloys 1, 249 (2013).
K.J. Li, Q.A. Li, X.T. Jing, J. Chen, X.Y. Zhang, and Q. Zhang: Effects of Sm addition on microstructure and mechanical properties of Mg-6Al-0.6Zn alloy. Scr. Mater. 60, 1101 (2009).
L. Blaz, T. Sakai, and J.J. Jonas: Effect of initial grain size on dynamic recrystallization of copper. Met. Sci. 17, 609 (1983).
F.Y. Cao, Z.M. Shi, G.L. Song, M. Liu, and A. Atrens: Corrosion behaviour in salt spray and in 3.5% NaCl solution saturated with Mg(OH)2 of as-cast and solution heat-treated binary Mg-X alloys: X = Mn, Sn, Ca, Zn, Al, Zr, Si, Sr. Corros. Sci. 76, 60 (2013).
J.X. Niu, Q.R. Chen, N.X. Xu, and Z.L. Wei: Effect of combinative addition of strontium and rare earth elements on corrosion resistance of AZ91D magnesium alloy. Trans. Nonferrous Met. Soc. China 18, 1058 (2008).
J. Yang, D.Q. Yi, and S.H. Deng: Effect of trace Nd on microstructure and corrosion resistance of AZ91 magnesium alloy. J. Mater. Sci. Eng. 26. 251 (2008).
W.J. Liu, F.H. Cao, A.N. Chen, L.R. Chang, J.Q. Zhang, and C.N. Cao: Corrosion behaviour of AM60 magnesium alloys containing Ce or La under thin electrolyte layers. Part 1: Microstructural characterization and electrochemical behavior. Corros. Sci. 52, 627 (2010).
The authors would like to acknowledge the financial support by the National Natural Science Foundation of China (51405216, 51165032), the Natural Science Foundation of Jiangxi Province (20151BAB216018), Ministry of Education Tied up with the Special Research Fund for the Doctoral Program for Higher School (20133601110001), Training Program Foundation for Young Scientist of Jiangxi (20153BCB23023).
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Hu, Z., Li, X., Hua, Q. et al. Effects of Sm on microstructure and corrosion resistance of hot-extruded AZ61 magnesium alloys. Journal of Materials Research 30, 3671–3681 (2015). https://doi.org/10.1557/jmr.2015.345