How to extract reliable core-volume fractions from core-shell polycrystalline microstructures using cross sectional TEM micrographs

F.H. Morshead, P.Y. Foeller, C.L. Freeman, H. Zhang, I.M. Reaney, D.C. Sinclair, J.S. Dean
2017 Journal of the European Ceramic Society  
A reliable method of extracting core-volume fraction from TEM micrographs of core-shell polycrystalline microstructures is presented. Three commonly used averaging methods based on a simple spherical model are shown to consistently underestimate the core-volume fraction due to the interpretation of a 3D structure from a 2D slice. The same trend is also revealed using Voronoi tessellated structures to mimic polycrystalline ceramics. In some cases the underestimate is less than half the true
more » ... volume fraction. We show that using a new maximum core-volume fraction methodology can improve the extracted value to a consistent error of less than 5%. This approach uses a value taken from the largest core-volume fraction measured from 10 grains that exhibit a core-shell microstructure. This provides increasing accuracy and improvements in the confidence of the measurement when extracting core-volume fractions of polycrystalline ceramics from 2D TEM micrographs.
doi:10.1016/j.jeurceramsoc.2017.03.006 fatcat:nizlw63jubamflwrdm7m5ohgxe