Nucleation kinetics of a solid phase in supercooled melts or liquids under heat-insulating conditions (The Initial Stage) |
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Authors: | Slezov V V Ostapchuk P N |
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Institution: | 1.National Science Center “Kharkov Institute of Physics and Technology,”, ul. Akademicheskaya 1, Kharkov, 61108, Ukraine ;2.Institute of Electrophysics and Radiation Technologies, National Academy of Sciences of Ukraine, ul. Chernyshevskogo 28, Kharkov, 61002, Ukraine ; |
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Abstract: | The initial stage of decomposition of a supercooled melt or a viscous liquid under heat-insulating conditions has been considered
in terms of the method of virtual media. The heat removal from the interface is taken as the controlling process in the vicinity
of a growing nucleus. In addition to the quasi-steady-state equations (which already became standard) for the nucleation rate
and the distribution function of subcritical particles of a new phase, an estimating equation has been derived for the time
required to reach steady-state values of these characteristics. Numerical evaluations have been performed for nickel. It has
been demonstrated that the chosen model of the controlling process is valid only under the condition of weak heat removal.
Attention has been drawn to the difference between the “diffusion” and “thermal” processes of nucleation. |
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