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Crystallization of undercooled liquid spinodals: Part II

Published online by Cambridge University Press:  31 January 2011

K. L. Lee  and
H. W. Kui
K. L. Lee
Affiliation:
Department of Physics, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong
H. W. Kui
Affiliation:
Department of Physics, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong
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Abstract

We demonstrated in “Phase separation in undercooled molten Pd80Si20: Part I” that when a molten Pd80Si20 ingot is undercooled into its undercooling regimen with ΔT ≥ 220 K (ΔT = T1 – T, where T1 is the liquidus and T is the temperature of the undercooled melt), liquid-state phase separation by spinodal decomposition occurs. On crystallization, one of the metastable liquid spinodals becomes Pd3Si, whereas the other one turns into Pd9Si2. In both cases, Pd particles precipitate out. Microstructural analysis indicates the Pd3Si subnetwork forms first. It then acts as a seed for the subsequent crystallization of the remaining undercooled melt, which finally forms the Pd9Si2 dendrites. As crystallization proceeds, latent heat and volume contraction bring about morphological changes.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 9 , September 1999 , pp. 3663 - 3667
Copyright
Copyright © Materials Research Society 1999

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References

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