MAS webinar: “TKD 101: An Introduction to Transmission Kikuchi Diffraction”

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Please join us for another MAS webinar! Chad Parish, Research and Development Staff Member in the Radiation Effects and Microstructural Analysis Group, Oak Ridge National Laboratory and long-time MAS member will talk about about the basics of Transmission Kikuchi Diffraction, analytical strategies and error sources and show a few examples of practical materials problem solving using TKD.

The live webinar will consist of a 50-minute presentation, followed by a Q&A. The webinar is free but requires a registration.

When: November 20, 2020 at 1 p.m. EDT.

Registration: https://umn.zoom.us/webinar/register/WN__vfPG3FBQAOzcYuIVfso2g

Webinar description: 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 work is supported by US Department of Energy, Office of Science, Fusion Energy Sciences, under contract number DE-AC05-00OR22725.

Keywords: SEM, TKD, EBSD

Webinar Speaker: Dr. Chad Parish is a Research and Development Staff Member in the Radiation Effects and Microstructural Analysis Group, Materials Science and Technology Division, Oak Ridge National Laboratory. His research involves electron microscopy to solve problems in materials for nuclear energy systems. Chad has been an MAS member since 2004 and the Secretary of MAS since 2018.