| Abstract Scope |
Grain boundary networks in polycrystalline systems are important for understanding a number of critically important materials phenomena including grain growth, fatigue life, and corrosion behavior. While this importance has long been understood, the characterization of these interfaces has been a challenge because the properties are a strong function of the crystallographic orientation of the grains on either side of the interface, but also the local interface normal. Not only does this require a three-dimensional analysis of the grain shapes and crystal orientations, but also introduces a large parameter space that requires tens-of-thousands interfaces to be analyzed. In this presentation we will show how the development of automated serial-sectioning with electron backscattered diffraction (EBSD) has enable exactly this type of analysis, presenting the properties of equilibrium grain networks in a BCC titanium alloy an FCC stainless steel, and contrast this with additively manufactured 316 stainless steel. We will show how equilibrium structures are dominated by grain boundary thermodynamics, while in the additively manufactured system, while much more chaotic, the development of the non-equilibrium interface distribution can be understood by the growth kinetics of sub-grain features. |