Influences of Al, Ce on the Microstructure and Mechanical Properties of As-Cast Mg-6Zn Alloy

Abstract:

The effects of minor Al and Ce on the microstructures, room-temperature and high-temperature mechanical properties of as-cast Mg-6Zn magnesium alloys were investigated. With the Al addition into Mg-6Zn alloy, the coarse eutectic Mg₅₁Zn₂₀ phases were refined and distributed discontinuously. After adding 0.5wt.% Ce into Mg-6Zn-1Al alloy, a new needle-like Al₂CeZn₂ phase was observed. Meanwhile, the volume fraction of Mg₅₁Zn₂₀ phase decreased and the semi-continuous Mg₅₁Zn₂₀ phase became discontinuous globular morphology. It has been observed that the addition of Ce element coarsens the grains, and 1wt.% Al addition enhanced the yield strength and ultimate strength from 86.35MPa, 229MPa to 90.7MPa, 238MPa, respectively. Moreover, the Ce addition can significantly increase the high-temperature mechanical properties of cast Mg-6Zn-1Al alloy.

• Periodical: Materials Science Forum (Volumes 747-748)
• Pages: 470-477
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.747-748.470
• Online since: February 2013
• Authors: Rui Dong Liu, Xu Guang Dong, Fu Jun Wei, Yuan Sheng Yang
• Keywords: Ce, High-Temperature Mechanical Properties, Magnesium Alloy, Mg-6Zn Alloy

References

[1] Frank Czerwinski, Magnesium Alloys- Design, Processing and Properties. India : E-Publishing, (2011).

[2] T. Zhou, H. Xia, Z. H. Chen, Effect of Ce on microstructures and mechanical properties of rapidly solidified Mg-Zn alloy, Mater. Sci. Tech. 27( 2011) 1198-1205.

DOI: 10.1179/026708310x12683158443242

[3] S.S. Park, G.T. Bae, D.H. Kang et al, Microstructure and tensile properties of twin-roll cast Mg-Zn-Mn-Al alloys, Scripta Mater. (57) 2007 793-796.

DOI: 10.1016/j.scriptamat.2007.07.013

[4] H.Y. Qi, G.X. Huang, R.D. Liu et al, Thermodynamic optimization of La-Zn and La-Mg-Zn systems, Journal of Alloys and Compounds 497(2010) 336-343.

DOI: 10.1016/j.jallcom.2010.03.062

[5] Ju Youn Lee, Hyun Kyu Lim, Do Hyung Kim et al, Effects of wolume fraction of qusicrystal on the mechanical properties of quasicrystal-reinforced Mg-Zn-Y alloys, Mater. Sci. Eng. A 448-451(2007) 987-990.

DOI: 10.1016/j.msea.2006.03.141

[6] D. F Zhang, F.G. Qi Fu, W. Lan et al, Effects of Ce addition on microstructure and mechanical properties of Mg-6Zn-1Mn alloy, Transactions of Nonferrous Metals Society of China 21(2011) 703-710.

DOI: 10.1016/s1003-6326(11)60769-3

[7] W.L. Xiao, S.S. Jia, J. Wang, Effects of cerium on the microstructure and mechanical properties of Mg-20Zn-8Al alloy, Mater. Sci. Eng. A. 474( 2008) 317-322.

DOI: 10.1016/j.msea.2007.04.008

[8] W.L. Xiao, Effects of rare earth on the structure and properties of Mg-6Zn-5Al-4Gd-1RE(RE=Ce or Y) alloys, J. Mater. Res. 23(2008) 1-12.

DOI: 10.1557/jmr.2008.0343

[9] Q.T. Hao, G.Y. Yang, W.Q. Jie, Effects of Sr+Ti+B addition on the microstructures and mechanical properties of ZA53 sand-casting magnesium alloy, Foundary. 55( 2006) 230-234.

[10] H.M. Liu, Y.G. Chen, Y.B. Tang, D.M. Huang, G. Niu, The microstructure and mechanical properties of permanent-mould cast Mg-5wt%Sn-(0-2. 6)wt% Di alloys, Mater. Sci. Eng. A. 437(2006): 348-355.

DOI: 10.1016/j.msea.2006.07.149

[11] J.M. Xiao, Energetics of Alloys, Shanghai Science and Technology Press, 1985, p.256.

[12] Y.C. Lee, A.K. Dahle, D.H. StJohn, The role of solute in grain refinement of magnesium, Metall. Meter. Trans. A. 31(2000): 2095-2906.

DOI: 10.1007/bf02830349

[13] H.Z. Zou, X.Q. Zeng, C.Q. Zhai, W.J. Ding, The effects of yttrium element on microstructure and mechanical properties of Mg-5wt. %Zn-2wt. %Al alloy, Mater. Sci. Eng. A. (402)2005: 142-148.

DOI: 10.1016/j.msea.2005.04.011