对一类相变体积分数计算公式的修正  

Modification on the volume fraction formulae of a sort of phase transformations

作　　者：王曙光[1] 叶国扬[1] 宁杰远[1] 楼小挺[1] 刘平江[1] 

机构地区：[1]北京大学地球与空间科学学院地球物理学系,北京100871

出　　处：《地球物理学报》2007年第6期1794-1801,共8页Chinese Journal of Geophysics

基　　金：国家自然科学基金项目(40774034;40521002);地震科学联合基金项目(105125)资助

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.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.

关 键 词：相变动力学 俯冲带 流变性 地幔间断面 深源地震 

分 类 号：P574[天文地球—矿物学]