Formation of Cu-rich Sphere Phase in Cu-80wt%Pb Hypermonotectic Alloys and the Effect of High Magnetic Field
Lin Zhang;;Xiaowei Zuo;Jicheng He
Cite this article:
Lin Zhang; Xiaowei Zuo; Jicheng He. Formation of Cu-rich Sphere Phase in Cu-80wt%Pb Hypermonotectic Alloys and the Effect of High Magnetic Field. Acta Metall Sin, 2008, 44(2): 165-171 .
Abstract The solidification process of Cu-80wt%Pb hypermonotectic alloys was investigated in four different experiment conditions. The formation process and structure of Cu-rich sphere phase has been analyzed, and the influence of high magnetic field and cooling rate have been considered. The results show that the morphology of spherical Cu-rich phases mainly has three kinds of microstructure, that is the larger “net-shell type” and the smaller “egg-type” or “eye-type”. The cooling rate of the samples has great effect on both macrostructure and microstructure. As the cooling rate become slow, the Cu-rich phase changed from the fine sphere to the larger floating sphere and the finally coarse dendrite, and the thickness of Cu-shell and reticulum of Cu-Pb in Cu-rich sphere phase became coarser; The 12T high magnetic fields have a remarkably effect of restraining the gravity segregation of Cu-Pb alloy by preventing from the floating of larger Cu-rich droplets and sedimentation of Pb-matrix, so that a macrostructure and microstructure of Cu-Pb monotectic alloy similar to one under relative fast cooling rate is formed. And the 12T high magnetic field maybe has the effect to inhibit the transition of Cu solute both outside and inside of Cu-rich sphere phase, which inhibit the Cu-rich shell from becoming thicker, and the Cu-Pb “net-like” phase from coarsening.
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