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| Rapid solidification behavior and microstructure of highly undercooled Cu--Pb monotectic alloy melts |
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| 1.西北工业大学; 2.太原科技大学 |
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Cite this article:
;. Rapid solidification behavior and microstructure of highly undercooled Cu--Pb monotectic alloy melts. Chin J Mater Res, 2004, 18(4): 357-364.
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Abstract The solidification behavior and structural evolution of Cu--Pb monotetic alloy
(Cu--25\%Pb, Cu--37.4\%Pb and Cu--40\%Pb, mass fraction) were investigated by means
of combination of melted glass denucleation and cyclical superheating, and the
relationships between undercooled microstructures and wear rate were studied.
The results show that during the solidification of undercooled Cu--25\%Pb
hypomonotectic melt, $\alpha$(Cu) nucleates first, whole solidification
course follows
the mode of the undercooled single--phase alloy melts, and the structures undergo
the evolvement processes in which fine dendrites change into a kind of
quasi--spherical grain with undercooling increasing. During the solidification
of undercooled Cu--37.4\%Pb monotectic and Cu--40\%Pb hypermonotectic melt,
$L_{2}$ liquid phase nucleates ahead of $\alpha$(Cu),
and the monotectic microstructures and the hypermonotectic microstructures
within undercooling range can be obtained, respectively. The wear rate of
Cu--37.4\%Pb monotectic alloy reduces gradually with the increase of undercooling.
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Received: 31 August 2004
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