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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: [email protected]
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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

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