Hostname: page-component-848d4c4894-xfwgj Total loading time: 0 Render date: 2024-07-01T15:13:46.688Z Has data issue: false hasContentIssue false
  • English
  • Français

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: hyan@ncu.edu.cn
Get access

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 (∆TE). 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 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

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