Computer Simulation of Final‐Stage Sintering: I, Model Kinetics, and Microstructure
Computer Simulation of Final‐Stage Sintering: I, Model Kinetics, and Microstructure
复制标题
DOI：
10.1111/j.1151-2916.1990.tb06686.x
复制
发表时间：
1990-10
影响因子：
3.9
通讯作者：
G. N. Hassold;I. Chen;D. Srolovitz
中科院分区：
文献类型：
--
作者：
G. N. Hassold;I. Chen;D. Srolovitz
建立了模拟烧结后期的Monte Carlo模型。该模型结合了现实的微观结构特征（晶粒和孔隙），可变的表面扩散率，晶界扩散率，晶界流动性。一个周期性阵列的孔隙的初步研究表明，模拟过程准确地再现理论预测的烧结动力学下的一组限制的假设。对更真实的烧结后期微观结构的研究表明，在模拟中观察到的演变在很宽的扩散率、初始孔隙率和初始孔径范围内与真实的烧结材料的微观结构非常相似。孔隙收缩、晶粒生长、孔隙脱离和再附着都已被观察到。孔隙率随烧结时间单调下降，并与初始孔隙率和扩散率沿沿着成比例。在缓慢的表面扩散或快速的晶界扩散条件下，与平衡孔形状的偏差产生比预期的烧结速率慢。
A Monte Carlo model for simulating final-stage sintering has been developed. This model incorporates realistic microstructural features (grains and pores), variable surface difusivity, grain-boundary diffusivity, and grain-boundary mobility. A preliminary study of a periodic array of pores has shown that the simulation procedure accurately reproduces theoretically predicted sintering kinetics under the restricted set of assumptions. Studies on more realistic final-stage sintering microstructure show that the evolution observed in the simulation closely resembles microstructures of real sintered materials over a wide range of diffusivity, initial porosity, and initial pore sizes. Pore shrinkage, grain growth, pore breakaway, and reattachment have all been observed. The porosity decreases monotonically with sintering time and scales with the initial porosity and diffusivity along the grain boundary. Deviations from equilibrium pore shapes under slow surface diffusion or fast grain-boundary diffusion conditions yield slower than expected sintering rates.