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Dendritic growth in undercooled Ni–25wt%Pb alloy melts
AbstractUndercooled dendritic growth of bulk Ni–25wt%Pb alloy was investigated. When the alloy was undercooled less than 50K, the solidification microstructures were composed of common dendrites and interdendritic lead phase. When the undercooling was up to 77K, rapidly directional “pseudo-couple” microstructure formed. With the undercooling increasing into the range of 132–240K, uniformly precipitated fine lead particles resulted from primary supersaturated dendrites were observed. When the alloy was undercooled up to 308K, refined granular grains with homogeneously distributed fine lead particles on it formed. By calculating the thermodynamic parameters based on the BCT model, it was found that the formation of “pseudo-couple” microstructure was owing to the directional growth of primary dendrites.
Dendritic growth in undercooled Ni–25wt%Pb alloy melts
AbstractUndercooled dendritic growth of bulk Ni–25wt%Pb alloy was investigated. When the alloy was undercooled less than 50K, the solidification microstructures were composed of common dendrites and interdendritic lead phase. When the undercooling was up to 77K, rapidly directional “pseudo-couple” microstructure formed. With the undercooling increasing into the range of 132–240K, uniformly precipitated fine lead particles resulted from primary supersaturated dendrites were observed. When the alloy was undercooled up to 308K, refined granular grains with homogeneously distributed fine lead particles on it formed. By calculating the thermodynamic parameters based on the BCT model, it was found that the formation of “pseudo-couple” microstructure was owing to the directional growth of primary dendrites.
Dendritic growth in undercooled Ni–25wt%Pb alloy melts
Zheng, Hongxing (author) / Li, Jianguo (author) / Guo, Xuefeng (author)
2005-08-03
4 pages
Article (Journal)
Electronic Resource
English
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