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Modification of near-eutectic Al–Si alloys with rare earth element samarium

Published online by Cambridge University Press:  09 June 2014

Hongxu Qiu ,
Hong Yan  and
Zhi Hu
Hongxu Qiu
Affiliation:
Department of Materials Processing Engineering, School of Mechanical Electrical Engineering, Nanchang University, Nanchang 330031, China; and Key Laboratory of Light Alloy Preparation & Processing, Nanchang, Nanchang 330031, China
Hong Yan*
Affiliation:
Department of Materials Processing Engineering, School of Mechanical Electrical Engineering, Nanchang University, Nanchang 330031, China; and Key Laboratory of Light Alloy Preparation & Processing, Nanchang, Nanchang 330031, China
Zhi Hu
Affiliation:
Department of Materials Processing Engineering, School of Mechanical Electrical Engineering, Nanchang University, Nanchang 330031, China; and Jiangxi Key Laboratory for Advanced Copper and Tungsten Materials, Jiangxi Academy of Sciences, Nanchang 330031, China
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

The modification of near-eutectic Al–Si alloy with samarium additions (0–0.9 wt.% content) has been studied. The thermal analysis results indicated that the addition of Sm in Al–12Si alloy caused a depression of eutectic temperature (∆T E). And it was found that Sm was capable of breaking down the primary α-A1 phases, giving rise to an increment in the number of dendrites. Simultaneous primary Si refinement and eutectic modification were achieved by Sm addition. When 0.6 wt.% Sm was added to the alloy, the silicon in Al–12Si alloy was best refined and showed a fully modified, fine fibrous eutectic structure; the primary α-Al phase appears as a slightly dual dendritic-cellular nature and a pine-tree structure. Moreover, the mechanical properties were investigated by the tensile test. A good combination of ultimate tensile strength (217 MPa) and elongation (1.3%) was obtained when the addition of Sm was up to 0.6 wt.%.

Keywords

SmAl–12Si alloymicrostructuremechanical propertiestransmission electron microscopy (TEM)
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 11 , 14 June 2014 , pp. 1270 - 1277
Copyright
Copyright © Materials Research Society 2014 

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References

REFERENCES

Mondolfo, L.F.: Aluminium Alloys: Structures and Properties; Butter-Worth: England, 1979; pp. 756–775.Google Scholar
ASM Hand Book, Friction, Wear and Lubrication; ASM International: Ohio: Metal Park, 1989; pp. 785–791.Google Scholar
Liao, H.C., Sun, Y., and Sun, G.X.: Correlation between mechanical properties and amount of dendritic α-Al phase in as-cast near-eutectic Al–11.6%Si alloys modified with strontium. Mater. Sci. Eng., A 335, 62 (2002).Google Scholar
Suárez-Peña, B. and Asensio-Lozano, J.: Microstructure and mechanical property developments in Al-12Si gravity die castings after Ti and/or Sr additions. Mater. Charact. 57, 218 (2006).CrossRefGoogle Scholar
Asensio-Lozano, J. and Suárez-Peña, B.: Effect of the addition of refiners and/or modifiers on the microstructure of die cast Al–12Si alloys. Scripta Mater. 54, 943 (2006).Google Scholar
Chang, J., Moon, I., and Choi, C.: Refinement of cast microstructure of hypereutectic Al-Si alloys through the addition of rare earth metals. J. Mater. Sci. 33, 5015 (1998).Google Scholar
Wu, S.S., Tu, X.L., and Fukuda, Y.: Modification mechanism of hypereutectic Al–Si alloy with P–Na addition. Trans. Nonferrous Met. Soc. China 13, 1285 (2003).Google Scholar
Elsebaie, O., Samuel, A.M., and Samuel, F.H.: Effects of Sr-modification, iron-based intermetallics and aging treatment on the impact toughness of 356 Al-Si-Mg alloy. J. Mater. Sci. 46, 3027 (2011).Google Scholar
Wu, Y.Y., Liu, , and Bian, X.F.: Effect of boron on the microstructure of near-eutectic Al-Si alloys. Mater. Charact. 58, 205 (2007).Google Scholar
Nogita, K., McDonald, S.D., and Dahle, A.K.: Eutectic modification of Al-Si alloys with rare earth metals. Mater. Trans. 45, 323 (2004).Google Scholar
Tsai, Y.C., Chou, C.Y., Lee, S.L., Lin, C.K., Lin, J.C., and Lim, S.W.: Effect of trace La addition on the microstructures and mechanical properties of A356 (Al-7Si-0.35Mg) aluminum alloys. J. Alloys Compd. 487, 157 (2009).Google Scholar
Huang, X. and Yan, H.: Effect of trace La addition on the microstructure and mechanical property of as-cast ADC12 Al-Alloy. J. Wuhan Univ. Technol., Mater. Sci. Ed. 28, 202 (2013).CrossRefGoogle Scholar
Mousavi, G.S., Emamy, M., and Rassizadehghani, J.: The effect of mischmetal and heat treatment on the microstructure and tensile properties of A357 Al-Si casting alloy. Mater. Sci. Eng., A. 556, 573 (2012).Google Scholar
Zhang, H.H., Duan, H.L., Shao, G.J., Xu, L.P., Yin, J.L., and Yan, B.: Modification mechanism of cerium on the Al-18Si alloy. Rare Met. 25, 11 (2006).Google Scholar
Xing, P.F., Gao, B., Zhuang, Y.X., Liu, K.H., and Tu, G.F.: Effect of erbium on properties and microstructure of Al-Si eutectic alloy. J. Rare Earth. 28, 927 (2010).Google Scholar
Na, H., Bian, X.F., Yin, K.B., and Yao, X.J.: Modification effect of Er on hypoeutectic Al-8Si alloy. J. Rare Earth. 23, 474 (2005).Google Scholar
Xu, C.L., Jiang, Q.C., Yang, Y.F., Wang, H.Y., and Wang, J.G.: Effect of Nd on primary silicon and eutectic silicon in hypereutectic Al–Si alloy. J. Alloys Compd. 422, L1 (2006).Google Scholar
Prukkanon, W., Srisukhumbowornchai, N., and Limmaneevichitr, C.: Influence of Sc modification on the fluidity of an A356 aluminum alloy. J. Alloys Compd. 477, 454 (2009).Google Scholar
Li, B., Wang, H.W., Jie, J.C., and Wei, Z.J.: Effects of yttrium and heat treatment on the microstructure and tensile properties of Al-7.5Si-0.5Mg alloy. Mater. Des. 32, 1617 (2011).Google Scholar
Chen, Z.W., Ma, C.Y., and Chen, P.: Modifying agent selection for Al-7Si alloy by Miedema model. Int. J. Min. Metall. Mater. 19, 131 (2012).Google Scholar
Peng, J.H., Li, W.F., Huang, F.L., and Du, J.: Effect of rare earth Pr on microstructure and mechanical properties of Al2O3-SiO2(sf)/Al-Si composites. Trans. Nonferrous Met. Soc. China 19, 1081 (2009).Google Scholar
Dahle, A.K., Nogita, K., McDonald, S.D., Dinnis, C., and Lu, L.: Eutectic modification and microstructure development in Al-Si Alloys. Mater. Sci. Eng., A 413, 243 (2005).Google Scholar
Aparicio, R., Barrera, G., Trapaga, G., Ramirez-Argaez, M., and Gonzalez-Rivera, C.: Solidification kinetics of a near eutectic Al-Si alloy, unmodified and modified with Sr. Met. Mater. Int. 19, 707 (2013).Google Scholar
Nogita, K., Yasuda, H., Yoshida, K., Uesugi, K., Takeuchi, A., Suzuki, Y., and Dahle, A.K.: Determination of strontium segregation in modified hypoeutectic Al–Si alloy by micro x-ray fluorescence analysis. Scripta Mater. 55, 787 (2006).Google Scholar
Lu, S.Z. and Hellawell, A.: The mechanism of silicon modification in aluminum-silicon alloys: Impurity induced twinning. Metall. Trans. A 18, 1721 (1987).Google Scholar
Chang, J.: Crystal morphology of eutectic Si in rare earth modified Al-7wt%Si alloy. J. Mater. Sci. 20, 1305 (2001).Google Scholar
Kobayashi, T.: Strength and fracture of aluminum alloys. Mater. Sci. Eng., A 280, 8 (2000).Google Scholar
Son, H.T., Lee, J.S., Kim, D.G., Yoshimi, K., and Maruyama, K.: Effects of samarium (Sm) additions on the microstructure and mechanical properties of as-cast and hot-extruded Mg-5 wt%Al-3 wt%Ca-based alloys. J. Alloys Compd. 473, 446 (2009).Google Scholar