Effects of Different Sr Additions on As Cast Microstructure and Tensile Properties of AS31 Alloy

Abstract:

Effects of different Sr additions (0.1%-1%Sr, mass fraction) on as-cast microstructure and tensile properties both at ambient temperature and elevated temperature of AS31 magnesium alloy were studied. The experimental results show that the addition of Sr could refine the grain size obviously and modify the eutectic Mg₂Si from Chinese script shape to polyhedral shape or fine fibers shape. The addition of Sr to AS31 alloy improved the tensile strength at ambient temperature, and the ultimate strength at 150°C first decrease and then increase with the Sr addition increase from 0.1% to 1%Sr.

• Periodical: Materials Science Forum (Volume 788)
• Pages: 110-114
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.788.110
• Online since: April 2014
• Authors: Ji Xue Zhou*, Dong Qing Zhao, Jin Wei Wang, Shou Qiu Tang, Wei Hong Li
• Keywords: AS31 Magnesium Alloy, Microstructure, SR, Tensile Properties

References

[1] B. Bronfin, M. Katsir, E. Aghion, Preparation and solidification features of AS21 magnesium alloy, Mater. Sci. Eng. A. 302 (2001) 46-50.

DOI: 10.1016/s0921-5093(00)01352-6

[2] J.M. Kim, K. Shin, K.T. Kim, W.J. Jung, Microstructure and mechanical properties of a thixocast Mg–Cu–Y alloy, Scripta Mater. 49 (2003) 687-691.

DOI: 10.1016/s1359-6462(03)00392-0

[3] S. Barbagallo, P. Cavaliere, E. Cerri, Compressive plastic deformation of an AS21X magnesium alloy produced by high pressure die casting at elevated temperatures, Mater. Sci. Eng. A. 367 (2004) 9-16.

DOI: 10.1016/j.msea.2003.09.101

[4] W. Blum, P. Zhang, B. Watzinger, B.V. Grossmann, H.G. Haldenwanger, Comparative study of creep of the die-cast Mg-alloys AZ91, AS21, AS41, AM60 and AE42, Mater. Sci. Eng. A. 319-321 (2001) 735-740.

DOI: 10.1016/s0921-5093(00)02016-5

[5] Y.C. Pan, X.F. Liu, H. Yang, Microstructural formation in a hypereutectic Mg–Si alloy, Mater. Charact. 55 (2005) 241-247.

DOI: 10.1016/j.matchar.2005.07.009

[6] J. J. Kim, D.H. Kim, K.S. Shin, N.J. Kim. Modification of Mg2Si morphology in squeeze cast Mg-Al-Zn-Si alloys by Ca or P addition, Scripta Mater. 41 (1999) 333-340.

DOI: 10.1016/s1359-6462(99)00172-4

[7] H.Y. Wang, Q.C. Jiang, B.X. MA, Y. Wang, J.G. Wang, J.B. Li, Modification of Mg2Si in Mg-Si alloys with K2TiF6, KBF4 and KBF4 + K2TiF6, J. Alloys Compd. 387 (2005) 105-108

DOI: 10.1016/j.jallcom.2004.06.027

[8] S. Q. Tang, J. X. Zhou, C. W. Tian, Y. S. Yang, Morphology modification of Mg2Si by Sr addition in Mg-4%Si alloy, Trans. Nonferrous Met. Soc. China. 21 (2011) 1932-1936.

DOI: 10.1016/s1003-6326(11)60952-7

[9] J. X. Zhou, Y. S. Yang, S. Q. Tang, C. W. Tian, Effects of Sr addition on as cast microstructure of AS31 alloy, Materials Science Forum. 686 (2011) 125-128.

DOI: 10.4028/www.scientific.net/msf.686.125

[10] M.B. Yang, J. Shen, Modification and refinement mechanism of Mg2Si phase in Sr-containing AZ61-0.7Si magnesium alloy, China Foundry, 6 (2009) 37-42.

[11] A. Srinivasan, U.T. S. Pillai, J. Swaminathan, S.K. Das, B.C. Pai, Observations of microstructure refinement in Mg-Al-Si alloys containing strontium, J. Mater. Sci. 41(2009 6087-6089.

DOI: 10.1007/s10853-006-0643-1