Engineering grain boundary anisotropy to elucidate grain growth behavior in alumina. Issue 13 (October 2022)

• Record Type: Journal Article
• Authors: Conry, Bryan; Harley, Joel B.; Tonks, Michael R.; Kesler, Michael S.; Krause, Amanda R.
• Is Part Of: Journal of the European Ceramic Society. Volume 42:Issue 13(2022)
• Page Start: 5864
• Page End: 5873
• Publication Date: 2022-10
• Subjects: Grain growth -- Thermomagnetic processing -- Texture -- Grain boundary network; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2022.06.059
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: 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 Al2 O3 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.