Utilization of Microalloying with Rare Earth Elements and Hot Extrusion for Remarkable Grain Refinement and Enhancement of Mechanical Properties of as-Cast Magnesium Alloy

Journal of Advanced Materials and Processing

دوره 8، شماره 4، بهمن 2020، صفحه 29-34   

نوع مقاله: Research Paper

نویسندگان

Hooman Abedi؛ Massoud Emamy^* ؛ Hamed Mirzadeh؛ Jafar Rassizadehghani؛ M. Ra'ayatpour

School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, P.O. Box 11155-4563, Tehran, Iran

چکیده

The effects of micro-addition by rare earth (RE) elements (via cerium-based mischmetal) and hot deformation (via extrusion process) on the microstructure and mechanical properties of Mg-0.5Zn-0.5Zr alloy were studied. Optical microscopy, scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), and tensile testing were used for characterization of alloys in the as-cast and wrought conditions. It was found that the addition of 0.5 wt% RE combined with the hot extrusion process could remarkably refine the grain size from 1320 µm for the as-cast Mg-0.5Zn-0.5Zr alloy to the recrystallized grain size of 1.3 µm for the extruded Mg-0.5Zn-0.5Zr-0.5RE alloy. Compared to the as-cast counterparts, the ultimate tensile strength (UTS) and total elongation to failure were significantly enhanced by the extrusion process. Quantitatively, the UTS of ~ 300 MPa with the total elongation of ~ 18% was obtained for the extruded Mg-0.5Zn-0.5Zr-0.5RE alloy, which reveals the favorable effects of the ultra grain refinement on the enhancement of the mechanical properties of magnesium alloys.

کلیدواژه‌ها

Mg alloys؛ Ultrafine grained microstructure؛ Recrystallization؛ Mechanical properties

مراجع

[1] Ö. Ayer,  Effect of die parameters on the grain size, mechanical properties and fracture mechanism of extruded AZ31 magnesium alloys, Materials Science and Engineering A 793 (2020) 139887.

[2] S. Lv, F. Meng, X. Lu, Q. Yang, X. Qiu, Q. Duan, J. Meng, Influence of Nd addition on microstructures and mechanical properties of a hot-extruded Mg− 6.0 Zn− 0.5 Zr (wt.%) alloy, Journal of Alloys and Compounds 806 (2019) 1166-1179.

[3] M.M. Hoseini-Athar, R. Mahmudi, R.P. Babu, P. Hedström, Effect of Zn content on the microstructural stability and grain growth kinetics of fine-grained extruded Mg–Gd–Zn alloys, Journal of Alloys and Compounds 831 (2020) 154766.

[4] I. Dinaharan, S. Zhang, G. Chen, Q. Shi, Development of titanium particulate reinforced AZ31 magnesium matrix composites via friction stir processing, Journal of Alloys and Compounds 820 (2020) 153071.

[5] J. Deng, Y.C. Lin, S.S. Li, J. Chen, Y. Ding, Hot tensile deformation and fracture behaviors of AZ31 magnesium alloy, Materials and Design 49 (2013) 209-219.

[6] M.A. Easton, M. Qian, A. Prasad, D.H. StJohn, Recent advances in grain refinement of light metals and alloys, Current Opinion in Solid State and Materials Science 20 (2016) 13-24.

[7] A.H. Blake, C.H. Cáceres, Solid-solution hardening and softening in Mg–Zn alloys, Materials Science and Engineering A 483 (2008) 161-163.

[8] F. Sayari, R. Mahmudi, R. Roumina, Inducing superplasticity in extruded pure Mg by Zr addition, Materials Science and Engineering A 769 (2020) 138502.

[9] A. Hadadzadeh, M.A. Wells, Analysis of the hot deformation of ZK60 magnesium alloy, Journal of Magnesium and Alloys 5 (2017) 369-387.

[10] K Guan, F Meng, P Qin, Q Yang, D Zhang, B Li, W. Sun, S. Lv, Y. Huang, N. Hort, J. Meng, Effects of samarium content on microstructure and mechanical properties of Mg–0.5Zn–0.5Zr alloy, Journal of Materials Science and Technology 35 (2019) 1368-1377.

[11] M. Yuan, Z. Zheng, Effects of Zn on the microstructures and mechanical properties of Mg–3Sm–0.5 Gd–xZn–0.5 Zr (x= 0, 0.3 and 0.6) alloy, Journal of Alloys and Compounds 590 (2014) 355-361.

[12] S. Wang, W. Zhang, H. Wang, J. Yang, W. Chen, G. Cui, G. Wang, Microstructures evolution, texture characteristics and mechanical properties of Mg-2.5 Nd-0.5 Zn-0.5 Zr alloy during the high strain rate hot-rolling, Materials Science and Engineering A (2020) 140488.

[13] M. Zhang, J. Zhao, M. Chen, Comparative study of the effects of CaO and Ce-La misch metal on the microstructure and properties of AZ91 alloy, Journal of Materials Research and Technology 9 (2020) 5194-5203.

[14] M. Golrang, M. Mobasheri, H. Mirzadeh, M. Emamy, Effect of Zn addition on the microstructure and mechanical properties of Mg-0.5Ca-0.5RE magnesium alloy, Journal of Alloys and Compounds 815 (2020) 152380.

[15] Stanford, Nicole, et al. "Effect of microalloying with rare-earth elements on the texture of extruded magnesium-based alloys." Scripta Materialia 59.7 (2008): 772-775.

[16] Huang, Yuanding, et al. "Role of multi-microalloying by rare earth elements in ductilization of magnesium alloys." Journal of magnesium and alloys 2.1 (2014): 1-7.

[17] Fang, Xiaogang, et al. "Effects of Ce/La misch metal content on microstructure evolution and mechanical properties of Mg-Zn-Y alloy." Materials Science and Engineering: A 699 (2017): 1-9.

[18] P. Cao, M. Qian, D.H. StJohn, Native grain refinement of magnesium alloys." Scripta Materialia 53 (2005) 841-844.

[19] S.M. Fatemi-Varzaneh, A. Zarei-Hanzaki, H. Beladi, Dynamic recrystallization in AZ31 magnesium alloy, Materials Science and Engineering: A 456 (2007) 52-57.

[20] S. You, Y. Huang, K.U. Kainer, N. Hort, Recent research and developments on wrought magnesium alloys, Journal of Magnesium and Alloys 5 (2017) 239-253.

[21] Z. Zeng, N. Stanford, C.H.J. Davies, J.F. Nie, Ni. Birbilis, Magnesium extrusion alloys: a review of developments and prospects, International Materials Reviews 64 (2019) 27-62.

[22] T. Al-Samman, G. Gottstein, Dynamic recrystallization during high temperature deformation of magnesium, Materials Science and Engineering A 490 (2008) 411-420.

[23] G. Dieter, Mechanical Metallurgy, 3^rd ed., McGraw-Hill, NewYork, 1986.

[24] H. Mirzadeh, High strain rate superplasticity via friction stir processing (FSP): A review, Materials Science and Engineering A 819 (2021) 141499.

[25] B.P. Zhang, L. Geng, L.J. Huang, X.X. Zhang, C.C. Dong, Enhanced mechanical properties in fine-grained Mg–1.0 Zn–0.5 Ca alloys prepared by extrusion at different temperatures, Scripta Materialia 63 (2010) 1024-1027.

[26] B. Pourbahari, H. Mirzadeh, M. Emamy, R. Roumina, Enhanced Ductility of a Fine‐Grained Mg–Gd–Al–Zn Magnesium Alloy by Hot Extrusion, Advanced Engineering Materials 20 (2018) 1701171.