中文摘要：

考虑了相变过程中生成相晶核的真实形状，对1956年Cahn给出的颗粒边界成核情况下成核长大型相变的相变体积分数计算公式进行了修正；当初始实验数据是成核率、长大率时，两种相变体积分数计算公式的计算结果差别很大．当初始实验数据是相变体积分数随时间变化的实验点时，两种相变体积分数计算公式所给出的计算结果的差别主要由拟合误差所致．无论从哪种实验数据开始计算，两种不同的计算模型给出的生成相的颗粒大小都存在很大区别，这将影响对俯冲带流变结构的认识．

英文摘要：

Considering the real shape of nuclei in phae transformation processes, we modified Cahn＇ s volume fraction formulae of the phase transformation with grain boundary nucleation and interface-controlled growth. When the input experimental data are nucleation and growth rates of phase transformations, there are great differences between the results calculated by the traditional formulae and those calculated by the modified formulae. If the input experimental data are in-situ observations of volume fraction in the phase transformation processes, the differences between them will be minor and mainly due to the fitting-errors. In any case, the differences of the grain sizes given by two models are huge, which will greatly influence the rheological structures in subduction zones.