Diffusion-controlled grain growth in two-phase solids
Diffusion-controlled grain growth in two-phase solids
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DOI：
10.1016/s1359-6454(97)00022-0
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发表时间：
1997-08-01
期刊：
影响因子：
9.4
通讯作者：
Chen, LQ
中科院分区：
文献类型：
--
作者：
Fan, DN;Chen, LQ
采用基于扩散界面场模型的二维计算机模拟方法，研究了体积守恒两相固体中的微观结构演化和晶粒生长动力学。在该模型中，两相微观结构由代表各相中颗粒结晶取向的非保守场变量和区分两相之间成分差异的保守成分场变量来描述。这些场变量的时间和空间演化，通过数值解的时间相关的金兹伯格-朗道（TDGL）方程。系统地研究了晶界能与界面能比值对显微组织特征的影响。结果表明，在体积守恒的两相固体中，晶粒生长受长程扩散控制，并遵循幂增长律R-m - R-o（m）= kt，m = 3。讨论了体积分数和初始组织的影响。(C)1997《冶金学报》
Microstructural evolution and the kinetics of grain growth in volume-conserved two-phase solids were investigated using two-dimensional (2-D) computer simulations based on a diffuse-interface field model. In this model, a two-phase microstructure is described by non-conserved field variables which represent crystallographic orientations of grains in each phase and by a conserved composition field variable which distinguishes the compositional difference between the two phases. The temporal and spatial evolution of these field variables were obtained through a numerical solution to the time-dependent Ginzburg-Landau (TDGL) equations. The effect of the ratios of grain boundary energies to interfacial energy on the microstructure features was systematically studied. It was found that grain growth in a volume-conserved two-phase solid is controlled by long-range diffusion and follows the power growth law, R-m - R-o(m) = kt With m = 3 in the scaling regime for all cases studied, including the microstructures containing only quadrijunctions. The effects of volume fractions and initial microstructures are discussed. (C) 1997 Acta Metallurgica Inc.