Heterogeneous nucleation of pb particles embedded in a Zn matrix |
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| Authors: | R Goswami K Chattopadhyay W T Kim B Cantor |
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| Affiliation: | (1) Centre for Advanced Study, Department of Metallurgy, Indian Institute of Science, 560 012 Bangalore, India;(2) Department of Physics, Chongju University, Chongju-shi, South Korea;(3) Oxford Centre for Advanced Materials and Composites, Department of Materials, University of Oxford, OX1 3PH Oxford, UK |
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| Abstract: | Zinc-10 and 20 wt pct Pb alloys have been rapidly solidified by melt spinning to obtain a very fine scale dispersion of nanometer-sized
Pb particles embedded in Zn matrix. The microstructure and crystallography of the Pb particles have been studied using transmission
electron microscopy (TEM). Each embedded Pb particle is a single crystal, with a truncated hexagonal biprism shape with the
6/mmm Zn matrix point group symmetry surrounded by and
facets. The Pb particles solidify with a well-defined orientation relationship with the Zn matrix of
![$$\left( {0001} \right)_{Zn} ||(111)_{Pb{\text{ }}} and{\text{ }}\left {{\text{11}}\overline {\text{2}} {\text{0}}} \right]_{Zn|} ||\left {1\overline 1 0} \right]_{Pb} $$](/content/mp12278676n37w07/11661_2007_Article_BF02663430_TeX2GIFIE2.gif)
. The melting and solidification behavior of the Pb particle have been studied using differential scanning calorimetry (DSC).
The Pb particles solidify with an undercooling of approximately 30 K, by heterogeneous nucleation on the {0001} facets of
the surrounding Zn matrix, with an apparent contact angle of 23 deg. |
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