Abstract
The good specific strength and specific modulus of magnesium alloys had drawn the attention of the automotive manufacturers for use in fuel efficient vehicles. Among the cast magnesium alloys, AZ91 (Mg–9Al–1Zn) is the most sought alloy because of its good casting properties. However, this alloy loses its strength and creep resistance properties above 120 °C due to softening of the β phase (Mg17Al12). Hence, this alloy cannot be used for making heavier engine components (power train), which require the thermal stability up to about 250 °C. The paper discusses the approach of modifying the AZ91 alloy by minor alloying additions to improve the high temperature withstanding capability without significantly affecting its casting properties. Additions of Ca to AZ91 alloy to the levels of about 0.4 wt% increased the ambient and high temperature strength of the base alloy. Additions of other minor alloying elements such as Sb, Pb, rare earths etc. can also increase the high temperature capability of the AZ91 by further modifying the β phase structure. The paper overviews the work carried out by the authors on the role of different alloying additions on the microstructure and mechanical properties of AZ91 magnesium alloys.
Similar content being viewed by others
References
Hu H, Yu A, Li N, and Allison J E, Mater Manuf Process, 18 (2003) 687.
Boby A, Pillai U T S, and Pai B C, Indian Foundry J 57 (2011), 29.
Han Q, Kad B K, and Viswanathan S, Philos Mag 84 (2004), 3843.
Luo A A, Mater Sci Forum Trans Tech Switz 419–422 (2003), 57.
Kulekci M K, Int J Adv Manuf Technol 39 (2008), 851.
Srinivasan A, Pillai U T S, and Pai B C, Mater Sci Eng A 527 (2010), 6543.
Srinivasan A, Pillai U T S, and Pai B C, Metall Mater Trans 36A (2005) 2235e43.
Pekguleryuz M O, and Baril E, J Mater Trans JIM 42 (2001), 1258.
Pettersen K, Lohne O, and Ryum N J, Metall Trans 21A (1999), 221.
Choi B H, You B S, Park W W, and Park I K M, Mater Sci Forum 475 (2005), 2477.
Feng X, Xuegang M, and Yangshan S, J Mater Sci 41 (2006), 4725.
Zhao Z, Chen Q, Wang Y, and Shu D, Mater Sci Eng A 515 (2009), 152.
Vinotha D, Raghukandan K, Pillai U T S, and Pai B C, Trans Indian Inst Met 62 (2009), 521.
Suresh M, Srinivasan A, Pillai U T S, and Pai B C, Mater Sci Eng A 528 (2011), 8573.
Ding H, and Liu X, Mater Lett 63 (2009), 635.
Werrwen D, Yangshan S, Xuegang M, Feng X, and Dengyun W, Trans Nonferr Met Soc China 13(6) (2003), 1274.
Balasubramani N, Suresh M, Srinivasan A, Pillai U T S, and Pai B C, Mater Sci 42 (2007), 8374.
Khomamizadeh F, Nami B, and Khoshkhooei S, Metall Mater Trans A 36a (2005), 3489.
Pekguleryuz M O, and Avedesian M M, in Proceedings of Magnesium Alloys and Their Applications, DGM, Oberursel (1992), p 213.
Yu F, Guohua W, Hongtao G, Guanqun L, and Chunquan Z, J Mater Sci 41 (2006), 5409e16.
Shengfa L, Liugen K, Hui H, and Zhongfan W, J Wuhan Univ Technol Mater Sci Ed 21(4) (2006), 45.
Li S-S, Tang B, and Zeng D-B, J Alloys Compd 437 (2007), 317.
Yuan G, Sun Y, and Ding W, Mater Sci Eng A 308 (2001) 38e44.
Srinivasan A, Influence of Si, Sb and Sr Additions on the Microstructure, Mechanical Properties and Corrosion Behavior of AZ91 Magnesium Alloy, PhD Thesis, Cochin University of Science and Technology (2008).
Srinivasan A, Pillai U T S, Swaminathan J, Das S K, and Pai B C, J Mater Sci 41 (2006), 6087Z.
Wang S-R, Guo P-Q, Yang L-Y, and Wang Y, JMEPEG 18 (2009), 137, ASM International, doi:10.1007/s11665-008-9255.
Socjusz-Podosek M, and Litynska L, Mater Chem Phys 80 (2003), 472.
Wang J, Wang L, An J, and Liu Y, J Mater Eng Perform 17 (2008), 725.
Srinivasan A, Pillai U T S, and Pai B C, Mater Sci Eng A 452–453 (2007), 87.
Acknowledgments
The author’s wishes to acknowledge the support given by the Director, NIIST-CSIR, help of Mr. Arun Bobby during the preparation of the manuscript, members of LMAC group for their help and support of CSIR-HRDG for the ES grant.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Pai, B.C., Pillai, U.T.S., Manikandan, P. et al. Modification of AZ91 Mg Alloys for High Temperature Applications. Trans Indian Inst Met 65, 601–606 (2012). https://doi.org/10.1007/s12666-012-0166-1
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12666-012-0166-1