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Microstructural Perturbations in Directionally Solidified Al-In, Al-Bi and Zn-Bi Monotectic Alloys

Published online by Cambridge University Press:  15 February 2011

B. Toloui ,
A. J. Macleod  and
D. D. Double
B. Toloui
Affiliation:
Department of Metallurgy and Science of Materials, University of Oxford, England.
A. J. Macleod
Affiliation:
Department of Metallurgy and Science of Materials, University of Oxford, England.
D. D. Double
Affiliation:
Department of Metallurgy and Science of Materials, University of Oxford, England.
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Abstract

Studies have been made of the microstructures developed in directionally solidified monotectic Al-In, Al-Bi and Zn-Bi alloys, as a function of growth velocity and temperature gradient. With increasing growth velocity and decreasing gradient the microstructures show transitions from regular rod-like arrangements of the lower melting point phase, through arrays of aligned droplets to coarse irregular droplet dispersions. Intermediate stages show rods with longitudinal shape perturbations of a classic Rayleigh-type instability. The changes are discussed in terms of oscillatory instabilities at the solid-liquid interface (enhanced by increasing growth velocity and decreasing temperature gradient) coupled with ripening effects in the solid + liquid region behind the interface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 12: Symposium L – In Situ Composites IV , 1981 , 253
Copyright
Copyright © Materials Research Society 1982

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References

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