Browse > Article

The Effect of Sr Addition and Holding Time on Microstructure of Al-10.5%Si-2%Cu Secondary Die-casting Alloys  

Shin, Sang-Soo (Green Technology Center, Korea Institute of Industrial Technology)
Kim, Myung-Yong (KOMSCO Co., Ltd.)
Yeom, Gil-Yong (ECO-Diecast Korea Co., Ltd.)
Publication Information
Journal of Korea Foundry Society / v.30, no.5, 2010 , pp. 161-166 More about this Journal
Abstract
In this examination, the effect of Sr addition and holding time on microstructure of Al-10.5wt%Si-2wt%Cu secondary die-casting alloy was investigated. Degree of undercooling was improved with increasing the Sr content in this alloy. Up to 0.02wt%Sr addition, acicular and lamellar eutectic structure was observed in the microstructure. Meanwhile, the eutectic Si was modified toward the fine fibrous form by increasing Sr content with more than 0.03wt% and holding time of the melt. The well- modified alloys showed decreased eutectic silicon size from 3.25 ${\mu}m$ to less than 0.8 ${\mu}m$. From these results, the optimal strontium content and holding time were identified on the Al-10.5wt%Si-2wt%Cu secondary die-casting alloy.
Keywords
Eutectic Si; Modification; Die-casting alloys; Strontium; Fine fibrous; Holding time;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Shu-Zu Lu and A. Hellawell, "Growth Mechanisms of Silicon in Al-Si Alloys", Journal of Crystal growth, 73(1985) 316-328.   DOI   ScienceOn
2 宋 基敬, 中江秀雄, "Al-Si共晶合金にぉける共晶Siの微細化機構" 鑄造 工學, 68 No.2 (1996) 148.
3 Yoshishige Tsumura, "On the Theory of Modification of Aluminium-Silicon Alloys", J. Japan Inst. Metals, 21 No.2 (1957) 69.   DOI
4 Tsumura Yoshishige, Sakaibara Akisaku, Toyoda Katsusaburo, Ishkawa Masatake, Adachi Mitsura, "On the mechanism of incubation period of modification effect on Al-Si alloy", J. Jpn. Inst. Light Met., 30 No.5 (1980) 239-245.   DOI   ScienceOn
5 C.B. Kim and R.W. Heine, "Fundamentals of Modification in the Aluminum-Silicon System", Journal of the Institute of Metals, 92 (1964) 367-376.
6 B. J. Ye, C.R. Loper, Jr., D. Y. Lu and C.S. Kang, "An assessment of the role of rare earth in the eutectic modification of cast aluminum-silicon alloys", AFS Trans, 93 (1985) 533- 544.
7 Ned P. Tenekedjiev, M. Hasim Mulazimoglu, Bernard Closset and John E. Gruzleski, "Microstructures and Thermal Analysis of Strontium -treated Aluminium-Silicon Alloys", AFS (1995).
8 D. Argo and J.E Gruzleski "Porosity in Modified aluminum Alloy Castings", AFS Transactions, (1988) 65-74.
9 B. M. Closset, S. Kahn, "Effect of impurities on strontium modification of Al-Si casting alloys", TMS Light Metal (1990), 869
10 R. D. Kassing, J. N. Schweitzer & F. L.Wuetig, "Sodium versus Strontium for the Modification of Hypoeutectic Aluminum-Silicon Alloys", AFS Transactions, (1979) 359-366.
11 A. Kaye, A. Street, Die Casting Metallurgy, Butterworths, London, (1982) 231-235.
12 A. Pacz : US Patent, 1387900 (1921).
13 S. C. Flood and J. D. Hunt, "Modification of Al-Si eutectic alloys with Na", Metal Sci. 15 (1981) 287-294.
14 G. K. Sigworth, "Theoretical and practical aspect of the modification of Al-Si alloys", AFS Transactions 66 (1983) 7-16.
15 C. H. Caceres and J. R. Griffith, "Damage by the Cracking of Si Particles in an Al-7Si-0.4Mg Casting Alloy", Acta mater. 44 (1996) 15.   DOI   ScienceOn
16 E. S. Kim, J. Y. Park, E. K. Jeon and I. M. Park, J. Kor. Foundrymen's Soc, "Current Status and Technology Trend of Domestic Diecasting industry for Automotive Parts", 27 (2007) 13-19.   과학기술학회마을
17 A. Street, "The Die Casting Books, Portcullis Press Ltd", (1977) 3-16, 625-641.