Effects of RE on Iron-Phase Morphology in As-Cast Al-7Si-0.3Mg Alloy Containing 1.2%Fe

Abstract:

In this work, the effects of the addition amount of rear earth on iron phase morphology of Al-7Si-0.3Mg alloy with 1.2%Fe were studied by Optical microscopy (OM), X-ray diffraction (XRD) and electron probe (EPMA). The results showed that: (1) the defined amount of RE addition can significantly inhibit the needle-like iron phase in Al-Si alloy. RE can make the needle-like β-Fe thick thinning, and some even blow or bending. When the addition of RE is 0.36%～0.48%, the modification effect to needle-like β-Fe phase are best. In high iron Al-Si alloys modified by RE, a small amount of bone-like Fe-rich compounds caused by Re were found. (2) after adding excess of RE (RE%>0.48%), a deterioration phenomenon emerged with the formation of large amount of needle-like and plate-like (AlSiRE) intermetallic compounds.

• Periodical: Advanced Materials Research (Volume 421)
• Pages: 114-117
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.421.114
• Online since: December 2011
• Authors: Hong Yan Wen, Xiao Ming Fan, Bin Ma, Guo Shan Deng
• Keywords: Al-Si Alloy, As-Cast, Iron Phase, Re

References

[1] S. Murali, K.S. Raman, K.S.S. Murthy. The formation β-FeSiAl5 and Be-Fe phases in Al-7Si-0.3Mg alloy containing Be[J]. Materials Science and Engineering,1995,A190(1-2): 165-172

DOI: 10.1016/0921-5093(94)09602-s

[2] X. F. Liu, X. F. Bian, Y. X. Liu,et al.The heredity of iron compound morphologies in Al alloys and spheroidizing mechanism[J].ACTA METALLURGICA SINICA,1997,33(10):1062-1068

[3] X. Z. Lin, F. Yin, B. D. Sun. Influence of Fe on the Properties of Al-Si Alloy and Methods of Neutralizing the Effect of Fe[J].Foundry Technology,1999,20(5):29-32

[4] X. B. Wu, Y. Gao, H. H. Zhang,et al. Study on elimination of iron phase in eutectic Al-Si cast alloy[J].Shanghai Metals,2008,30(5):24-30

[5] S. Murali, K.S. Raman, K.S.S. Murthy.Effect of magnesium iron(impurity)and solidification on the toughness of Al-7Si-0.3Mg casting alloy[J].Material Science and Engineering,1992, (A151): 213-215

DOI: 10.1016/0921-5093(92)90175-z

[6] X.M. Fan, J.F. Liu, M.Q. Liu.Effects of Strontium on Microstructure and Mechanical Properties of Al-12Si-1.2Fe Alloy[J]. Special Casting & Nonferrous Alloys, 2007, 27(11):891-893

[7] D. L. Cao, Z. N. Shi, S. H. Yang. Effects of Rare Earth on Aluminium and its Alloys[J]. Chinese Rare Earths,2006,27(5):88-91

[8] L. J. Yao, G. C. Yang, M. Zhu. Effect of Cerium-rich Mischmetal on Microstructures of As-cast A356 Alloy[J]. Foundry Technology, 2009,30(2):185-188.

[9] D. Fang, X.M. Fan.Effects of Ce on As-cast microstructure of A356 Alloy with High Fe content[J].Special Casting & Nonferrous Alloys, 2011, 31(1):87-90