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Morphology and thermal characteristics of nano-sized Pb–Sn inclusions in Al

Published online by Cambridge University Press:  31 January 2011

P. Bhattacharya ,
V. Bhattacharya  and
K. Chattopadhyay
P. Bhattacharya
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, and Department of Metallurgy, Indian Institute of Science, Bangalore-560012, India
V. Bhattacharya
Affiliation:
Department of Metallurgy, Indian Institute of Science, Bangalore-560012, India
K. Chattopadhyay
Affiliation:
Department of Metallurgy, Indian Institute of Science, Bangalore-560012, India
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Abstract

Nanoembedded aluminum alloys with bimetallic dispersoids of Sn and Pb of compositions Sn82–Pb18, Sn64–Pb36, and Sn54–Pb46 were synthesized by rapid solidification. The two phases, face-centered-cubic Pb and tetragonal Sn solid-solution, coexist in all the particles. The crystallographic relation between the two phases and the matrix depends upon the solidification pathways adopted by the particles. For Al–(Sn82–Pb18), we report a new orientation relation given by [011]Al//[010]Sn and (o11)A1//(101)Sn. Pb exhibits a cube-on-cube orientation with Al in few particles, while in others no orientation relationship could be observed. In contrast, Pb in Sn64–Pb36 and Sn54–Pb46 particles always exhibits cube-on-cube orientation with the matrix. Sn does not show any orientation relationship with Al or Pb in these cases. Differential scanning calorimetry studies revealed melting at eutectic temperature for all compositions, although solidification pathways are different. Attempts were made to correlate these with the melting and heterogeneous nucleation characteristics.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 11 , November 2002 , pp. 2875 - 2883
Copyright
Copyright © Materials Research Society 2002

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References

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