Determination of the critical nucleation frequency in undercooled metal melt

摘要

By studying the effect of thermodynamic and kinetic factors on the nucleation frequency of under- cooled metals, the expressions for heterogeneous and homogenous critical nucleation frequencies have been established. The results show that the homogenous critical nucleation frequency per unit volume is directly proportional to the ratio of The cooling rate to the volume of liquid metal. As the value of the equilibrium contact angle function f(θ) of the most Effective catalyst is constant, the heterogeneous critical nucleation frequency per unit area of the catalyst surface is di- Rectly proportional to the ratio of the cooling rate to the sum of the surface area of the most effective catalyst surface (R_c/VS_v