A Homogeneous Solidification Criterion for Undercooled Ni-20at%Pb Hypermonotectic Melts

Hui Xie; Gen Cang Yang; Lei Jia; Zhen Lin Lu

doi:10.4028/www.scientific.net/MSF.695.340

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A Homogeneous Solidification Criterion for Undercooled Ni-20at%Pb Hypermonotectic Melts

Abstract:

The kinetic process of liquid-liquid phase separation in the undercooled Ni-20at%Pb hypermonotectic alloy melts was analyzed theoretically. The results showed that liquid-liquid separation could not be inhibited due to smaller nucleation barrier and bigger nucleation rate of Pb-rich droplets. In the course of liquid-liquid phase separation, the volume fraction of Pb-rich droplets was thought as a function of time or temperature. At a certain cooling rate, the volume fraction was mainly controlled by the undercooling of Ni-Pb hypermonotectic melts. Based on the above results, a homogeneous solidification criterion for the undercooled Ni-20at%Pb hypermonotectic alloy melts was developed. Such a criterion predicted that the homogeneous microstructure could be obtained at the undercooling 263K, and the experimental results accorded with the predicting ones on the whole.

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Materials Science Forum (Volume 695)

Pages:

340-343

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.695.340

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Online since:

July 2011

Authors:

Hui Xie, Gen Cang Yang, Lei Jia, Zhen Lin Lu

Keywords:

High Undercooling, Homogeneous Solidification, Liquid-Liquid Phase Separation, Ni-Pb Hypermonotectic Alloy

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