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Effects of Sr and B addition on microstructure and mechanical properties of AZ91 magnesium alloy

Published online by Cambridge University Press:  31 January 2011

H.L. Zhao ,
S.K. Guan  and
F.Y. Zheng
H.L. Zhao*
Affiliation:
College of Materials Science & Engineering, Zhengzhou University, Zhengzhou 450002, People’s Republic of China
S.K. Guan
Affiliation:
College of Materials Science & Engineering, Zhengzhou University, Zhengzhou 450002, People’s Republic of China
F.Y. Zheng
Affiliation:
College of Materials Science & Engineering, Zhengzhou University, Zhengzhou 450002, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: zhlwkr@zzu.edu.cn
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Abstract

The effects of Sr and B addition on the microstructure and mechanical properties of AZ91 alloy were studied. The results of this work show that a small amount of Sr addition to AZ91 refined the grain size. The highest tensile strength was obtained from the alloy with the optimal composition of 0.5% Sr and 0.09% B added, in which the average grain size was 42 μm. The tensile strength and elongation of the AZ91–0.5%Sr–0.09%B alloy were 151 MPa and 1.62%, respectively. Some needle-shaped Al4Sr particles distributed mainly at grain boundaries have been observed in the alloys with Sr and B additions. The fluidity is improved significantly, and the solidification range decreased by adding Sr and B. The liquidus of AZ91 alloy decreased markedly with the addition of Sr and B, but the solidus hardly changed. Therefore, the solidification range can be decreased, which will improve the die-casting properties.

Keywords

MgSrMicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 9 , September 2007 , pp. 2423 - 2428
Copyright
Copyright © Materials Research Society 2007

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References

REFERENCES

1Hirai, K., Somekawa, H., Takigawa, Y.Higashi, K.: Effects of Ca and Sr addition on mechanical properties of a cast AZ91 magnesium alloy at room and elevated temperature. Mater. Sci. Eng., A 403, 276 2005CrossRefGoogle Scholar
2Spassov, T., Rangelova, V.Neykov, N.: Nanocrystallization and hydrogen storage in rapidly solidified Mg–Ni–RE alloys. J. Alloys Compd. 334, 219 2001CrossRefGoogle Scholar
3Lu, Y., Wang, Q., Zeng, X., Ding, W., Zhai, C.Zhu, Y.: Effects of rare earths on the microstructure, properties and fracture behavior of Mg–Al alloys. Mater. Sci. Eng., A 278, 66 2000CrossRefGoogle Scholar
4Bursik, J.Svoboda, M.: A HREM and analytical STEM study of precipitates in an AZ91 magnesium alloy. Mikrochim. Acta 139, 39 2002Google Scholar
5Yan, C., Ye, L.Mai, Y-W.: Effect of constraint on tensile behavior of an AZ91 magnesium alloy. Mater. Lett. 58, 3219 2004CrossRefGoogle Scholar
6Pekguleryuz, M.O.Baril, E.: Magnesium Technology TMS Warrendale, PA 2001 119125Google Scholar
7Wang, H-y., Liu, S-f.Xu, P.: The effect of Sr addition on magnesium and its alloys. Foundry 54, 1121 2005Google Scholar
8Jingyang, C., Shaokang, G., Guangxin, S.Chunxiang, Z.: Effects of B on microstructure and properties of Mg–7Al–0.4Zn–0.2Mn alloy. Special Casting Nonferrous Alloys 8, 454 2005Google Scholar
9Liqin, G., Jianguo, L.Peng, Z.: Effect of Al3Ti3B master alloy on microstructure and mechanical properties of AZ91D magnesium alloy. Chin. J. Nonferrous Metals 12, 2003 2004Google Scholar
10Lu, L., Dahle, A.K., Taylor, J.A.John, D.H. St.: Theoretical and practical considerations of grain refinement of Mg–Al alloys(A). Mater. Sci. Forum 488–489, 299 2005CrossRefGoogle Scholar
11Liu, Z., Zhang, K.Zeng, X.Q.: The Theory Foundation of Magnesium-Based Lightweight Alloys and Their Applications Machine Industry Press Beijing, China 2002 25–26Google Scholar
12Yuan, G.Y., Liu, Z.L.Wang, Q.D.: Microstructure refinement of Mg–Al–Zn–Si alloys. J. Mater. Lett. 53–58, 56 2002Google Scholar