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Synthesis and Microstructure of Laser Surface Alloyed Al–Sn–Si Layer on Commercial Aluminum Substrate

Published online by Cambridge University Press:  01 June 2005

Abhijit Pramanick ,
Subhradeep Chatterjee ,
Victoria Bhattacharya  and
Kamanio Chattopadhyay
Abhijit Pramanick
Affiliation:
Department of Metallurgy, Indian Institute of Science, Bangalore – 560 012, India
Subhradeep Chatterjee
Affiliation:
Department of Metallurgy, Indian Institute of Science, Bangalore – 560 012, India
Victoria Bhattacharya*
Affiliation:
Department of Metallurgy, Indian Institute of Science, Bangalore – 560 012, India
Kamanio Chattopadhyay
Affiliation:
Department of Metallurgy, Indian Institute of Science, Bangalore – 560 012, India
*
a) Address all correspondence to this author. e-mail: victoria@met.iisc.ernet.in
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Abstract

A new type of bearing alloy containing ultrafine sized tin and silicon dispersions in aluminum was designed using laser surface alloying and laser remelting techniques. The microstructures of these non-equilibrium processed alloys were studied in detail using scanning and transmission electron microscopy. The microstructures revealed three distinct morphologies of tin particles namely elongated particles co-existing with silicon, globular particles, and very fine particles. Our detailed analyses using cellular growth theories showed that the formation of these globular tin particles was due to the pinching off of the tin rich liquid in the inter-cellular space by the growth of aluminum secondary dendrite arms. Evidence of fine recrystallized aluminum grains at the top layer due to constrained solidification was shown. Thermal analyses suggested that melting of the spherical shaped tin particles was controlled by the binary aluminum-tin eutectic reaction, whereas non-spherical tin particles melted via the tin-silicon eutectic reaction.

Keywords

CellularLaserMicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 6 , June 2005 , pp. 1580 - 1589
Copyright
Copyright © Materials Research Society 2005

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References

REFERENCES

1Bhattacharya, V. and Chattopadhyay, K.: Microstructure and wear behavior of aluminium alloys containing embedded nanoscaled lead dispersoids. Acta Mater. 52, 2293 (2004).CrossRefGoogle Scholar
2Kear, B.H., Mayer, J.W., Poate, J.M. and Strutt, P.R.Surface treatments using laser, electron and ion beam processing methods. Metall. Treatises, Metall. Soc. AIME 321, (1981).Google Scholar
3Mordike, B.L.: Lasers in materials processing. Prog. Mater. Sci. 42, 357 (1997).CrossRefGoogle Scholar
4Phanikumar, G., Dutta, P., Galun, R. and Chattopadhyay, K.: Microstructural evolution during remelting of laser urface alloyed hyper-monotectic Al–Bi alloy. Mater. Sci. Eng. A 371, 91 (2004).CrossRefGoogle Scholar
5David, S.A. and Vitek, J.M.: Correlation between solidification parameters and weld microstructures. Int. Mater. Rev. 34, 213 (1989).Google Scholar
6Cliff, G. and Lorimer, G.W.: The quantitative analysis of thin specimens. J. Microsc. 103, 203 (1975).Google Scholar
7Hunt, J.D.Cellular and primary dendrite spacings. Solidification and Casting of Metals, TMS, London 3, (1979).Google Scholar
8Trivedi, R.: Interdendritic spacing II. A comparison of theory and experiment. Metall. Trans. 15A, 977 (1984).CrossRefGoogle Scholar
9Kim, W.T., Zhang, D.L. and Cantor, B.: Microstructure of rapidly solidified aluminium-based immiscible alloys. Mater. Sci. Eng. A 134, 1133 (1991).Google Scholar
10Majumdar, B. and Chattopadhyay, K.: The Rayleigh instability and the origin of rows of droplets in the monotectic microstructure of zinc-bismuth alloys. Metall. Mater. Trans. 27A, 2053 (1996).CrossRefGoogle Scholar
11Nichols, F.A. and Mullins, W.W.: Surface- (interface-) and volume-diffusion contributions to morphological changes driven by capillarity. Trans. Metall. Soc. 233, 1840 (1965).Google Scholar
12Camel, D., Eustathopoulos, N. and Desre, P.: Chemical adsorption and temperature dependence of the solid-liquid interfacial tension of metallic binary alloys. Acta Metall. 28, 239 (1980).Google Scholar
13Trivedi, R. and Somboonsuk, K.: Constrained dendritic growth and spacing. Mater. Sci. Eng. A 65, 65 (1984).Google Scholar
14 Al–Sn phase diagram, in Binary Alloy Phase Diagrams, Vol. 1, edited by Massalski, T.B. (ASM, Metals Park, OH, 1990), p. 216.Google Scholar
15 Al–Si–Sn phase diagram, in Ternary Alloy Phase Diagrams, Vol. 4, edited by Villars, P., Prince, A., and Okamoto, H. (ASM, Metals Park, OH, 1995), p. 4299.Google Scholar
16 Al–Si–Sn phase diagram, in Ternary Alloys, A Comphrehensive Compendium of Evaluated Consitutional Data and Phase Diagram, Vol. 8, edited by Petzow, G. and Effenberg, G. (MSI Weinheim, Basel, Switzerland, 1995), p. 263.Google Scholar
17Yuan, G.C., Li, Z.J., Lou, Y.X. and Zhang, X.M.: Study on crystallization and microstructure for new series of Al–Sn–Si alloys. Mater. Sci. Eng. A 280, 108 (2000).Google Scholar
18 Si–Sn phase diagram, in Binary Alloy Phase Diagrams, Vol. 3, edited by Massalski, T.B. (ASM, Metals Park, OH, 1990), p. 3362.Google Scholar
19Kim, W.T. and Cantor, B.: Solidification of tin droplets embedded in an aluminum matrix. J. Mater. Sci. 26, 2868 (1991).Google Scholar