Over the last two to three decades, electron backscatter diffraction (EBSD) emerged as one of the most powerful and exciting methods in electron microscopy to quantify the crystallographic microstructures of materials. Over the last decade or so, transmission Kikuchi diffraction (TKD) has emerged as a vital and important complement to EBSD. In TKD, a thin specimen (as might be used for transmission electron microscopy) is mounted into the scanning electron microscope (SEM) and held very near (<10 mm) the objective lens. Electron Kikuchi diffraction patterns are then acquired using the EBSD hardware, but in transmission mode and from the electron exit surface of the foil, as opposed to reflection mode from the entrance surface as in EBSD. This provides improved spatial resolution, often 10 nm or finer, compared to several hundred nm or coarser in conventional EBSD. This opens unprecedented capabilities for materials analysis.
This seminar will (1) briefly discuss the basics of TKD and put them into their historical perspective compared to EBSD; (2) discuss how to acquire TKD data, with emphasis on artifacts, errors, and things to watch out for; and (3) show a few examples of practical materials problem solving using TKD.
This webinar will be presented by Dr. Chad Parish, a Research and Development Staff Member in the Radiation Effects and Microstructural Analysis Group, Materials Science and Technology Division, Oak Ridge National Laboratory.