晶界
材料科学
各向异性
晶粒生长
晶界强化
晶界扩散系数
凝聚态物理
化学物理
粒度
冶金
微观结构
光学
物理
作者
Bryan Conry,Joel B. Harley,Michael Tonks,Michael S. Kesler,Amanda R. Krause
标识
DOI:10.1016/j.jeurceramsoc.2022.06.059
摘要
Current grain growth models have evolved to account for the relationship between grain boundary energy/mobility anisotropy and the five degrees of grain boundary character. However, the role of grain boundary networks on overall growth kinetics remains poorly understood. To experimentally investigate this problem, a highly textured Al2O3 was fabricated by colloidal casting in a strong magnetic field to engineer a unique spatial distribution of grain boundary character. Microstructural evolution was quantified and compared to an untextured sample. From this comparison, a prevalence of (0001)/(0001) terminated grain boundaries with anisotropic networks were identified in the textured sample. These boundaries and their networks were found to be driving grain growth at a faster rate than predicted by models. These findings will allow better modelling of grain growth in real systems by experimentally exploring the impact thereon of grain boundary plane anisotropy and relative energy/mobility differences between neighboring boundaries.
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