Microstructures and Mechanical Properties of Mg-8Al-1Nd-0.5Zn-xSr Alloys

Abstract:

Article Preview

The influence of trace strontium (Sr) addition on the microstructure and mechanical properties of Mg-8Al-1Nd-0.5Zn was investigated with OM, SEM, and XRD etc. The results show that the lamellar eutectics and divorced β-Mg17Al12 were reduced or refined with trace Sr addition. Among the as-cast Mg-8Al-1Nd-0.5Zn-xSr alloys, the Mg-8Al-1Nd-0.5Zn-0.05Sr alloy exhibited the best mechanical properties in which the tensile strength, the yield strength reached to 244.9 MPa and 111.7 MPa respectively. In addition, with the increase of Sr addition, the ductility was improved and it was observed that the number of cleavage steps and secondary cracks decreased on the fracture surfaces of tensile samples. It was also observed that the fractures occurred in the coarse β-Mg17Al12 phase instead of the Mg/Mg17Al12 interface or Al11Nd3 phase.

Info:

Periodical:

Materials Science Forum (Volumes 747-748)

Edited by:

Yafang Han, Junpin Lin, Chengbo Xiao and Xiaoqin Zeng

Pages:

282-288

DOI:

10.4028/www.scientific.net/MSF.747-748.282

Citation:

B. L. Shi et al., "Microstructures and Mechanical Properties of Mg-8Al-1Nd-0.5Zn-xSr Alloys", Materials Science Forum, Vols. 747-748, pp. 282-288, 2013

Online since:

February 2013

Export:

Price:

$35.00

[1] H. Friedrich, S. Schumann, Research for a new age of magnesium, in the automotive industry, J. Mater. Process. Tech. 117 (2001) 276-281.

[2] Z. Zhang, A. Couture, A. Luo, An investigation of the properties of Mg-Zn-Al alloys, Scr. Mater. 39(1) (1998) 45–53.

[3] I.A. Yakubtsov, B.J. Diak, C.A. Sager, B. Bhattacharya, W.D. Macdonald, M. Niewczas, Effects of heat treatment on microstructure and tensile deformation of Mg AZ80 alloy at room temperature, Mater. Sci. Eng. A 496 (2008) 247-255.

DOI: 10.1016/j.msea.2008.05.019

[4] M.F. Higashihiroshima, Y.Y. Hiroshima, N.S. Hiroshima, S. H Kure, Method of manufacturing a forged magnesium alloy, U.S. Patent 5, 409, 555. (1995).

[5] Y.Z. Lü, Q.D. Wang, W.J. Ding, X.Q. Zeng, Y.P. Zhu, Fracture behavior of AZ91 magnesium alloy, Mater. Lett. 44 (2000) 265-268.

[6] T.P. Zhu, Z.W. Chen, W. Gao, Effect of cooling conditions during casting on fraction of β-Mg17Al12 in Mg–9Al–1Zn cast alloy, J. Alloys. Compd. 501 (2010) 291–296.

DOI: 10.1016/j.jallcom.2010.04.090

[7] L.A. Dobrzanski, T. Tanski, L. Cizek, Z. Brytan, Structure and properties of magnesium cast alloys, J. Mater. Process. Tech. 192-193 (2007) 567-574.

DOI: 10.1016/j.jmatprotec.2007.04.045

[8] D.G. Mccartney , Grain refining of aluminum and its alloys using inoculants, Int. Mater. Rev. 34(5) (1989) 247-260.

[9] J.L. Wang, J. Yang, Y.M. Wu, H.J. Zhang, L.M. Wang, Microstructures and mechanical properties of as-cast Mg–5Al–0. 4Mn–xNd (x = 0, 1, 2 and 4) alloys, Mater. Sci. Eng. A 472 (2008) 332-337.

DOI: 10.1016/j.msea.2007.03.036

[10] Y.L. Song, Y.H. Liu, X.Y. Zhu, S.H. Wang, S.R. Yu, Effect of neodymium on microstructure and mechanical properties of AZ91 magnesium alloy, J. Jilin Univ (Eng and Technol Edition) 36(3) (2006) 289-293.

[11] X.Q. Zeng, Y.X. Wang, W.J. Ding, A.A. Luo, A.K. Sachdev, Effect of Strontium on the Microstructure, Mechanical Properties, and Fracture Behavior of AZ31 Magnesium Alloy, Metall. Mater. Trans. 37 (2006) 1333-1341.

DOI: 10.1007/s11661-006-1085-8

[12] A. Sadeghi, M. Pekguleryuz, Microstructure, mechanical properties and texture evolution of AZ31 alloy containing trace levels of strontium, Mater. Charact. 62 (2011) 742-750.

DOI: 10.1016/j.matchar.2011.05.006

[13] H.L. Zhao, S.K. Guan, F.Y. Zheng, Effects of Sr and B addition on microstructure and mechanical properties of AZ91 magnesium alloy, J. Mater. Res. 22 (2007) 2423-2428.

DOI: 10.1557/jmr.2007.0331

[14] A. Srinivasan, U.T.S. Pillai, J. Swaminathan, S.K. Das, B.C. Pai, Observations of microstructural refinement in Mg–Al–Si alloys containing strontium, J. Mater. Sci. 41 (2006) 6087–6089.

DOI: 10.1007/s10853-006-0643-1

[15] A.K. Dahle, Y.C. Lee, M.D. Nave, P.L. Schaffer, D.H. Stjohn, Development of the As-Cast Microstructure in Magnesium–Aluminium Alloys, J. Light. Met. 1 (2001) 61–72.

DOI: 10.1016/s1471-5317(00)00007-9

[16] A. Srinivasan, S. Ningshen, U.K. Mudali, U.T.S. Pillai, B.C. Pai, Influence of Si and Sb additions on the corrosion behavior of AZ91 magnesium alloy, Intermetallics, 15 (2007) 1511-1517.

DOI: 10.1016/j.intermet.2007.05.012

[17] Y.C. Lee, A.K. Dahle, D.H. Stjohn, The Role of Solute in Grain Refinement of Magnesium, Metall. Mater. Trans. 31 (2000) 2895-2906.

DOI: 10.1007/bf02830349

[18] P. Zhao, Q.D. Wang, C.Q. Zhai, Y.P. Zhu, Effects of strontium and titanium on the microstructure, tensile properties and creep behavior of AM50 alloys, Mater. Sci. Eng. A 444 (2007) 318–326.

DOI: 10.1016/j.msea.2006.08.111

[19] S. Candan, M. Unal, M. Turkmen, E. Koc, Y. Turen, E. Candan, Improvement of mechanical and corrosion properties of magnesium alloy by lead addition, Mater. Sci. Eng. A 501 (2009) 115–118.

DOI: 10.1016/j.msea.2008.09.068

[20] S. Candan, M. Unal, E. Koc, Y. Turken, E. Candan, Effects of titanium addition on mechanical and corrosion behaviours of AZ91 magnesium alloy, J. Alloys. Compd. 509 (2011) 1958–(1963).

DOI: 10.1016/j.jallcom.2010.10.100

[21] H. Cao, M. Wesén, Effect of Microstructure on Mechanical Properties of As-Cast Mg-Al Alloys, Metall. Mater. Trans. 35 (2004) 309-319.

DOI: 10.1007/s11661-004-0132-6

In order to see related information, you need to Login.