Description
Although significant advances have been made in elucidating atomic-scale mechanisms that control properties of polycrystalline materials for a wide range of applications, the need for predictive understanding of material response based on crystal orientation information still exists. In this discussion, a combined approach to understanding strain-driven microstructural evolution processes using in situ transmission electron microscopy (TEM) and precession diffraction is described. Specifically, TEM-based Nanomegas DIGISTAR/ASTAR orientation mapping and precession diffraction techniques in conjunction with in situ TEM heating, strain, and irradiation will be discussed. Case studies of the advantages and drawbacks of TEM-based orientation imaging and precession diffraction during in situ TEM exploration of the stability of irradiated nanocrystalline BCC metals and strain-based twin evolution in FCC metals will be highlighted, and compared to SEM-based EBSD strain measurement techniques. The results presented will help provide a connection of the role of localized strain in developing stable materials for extreme applications.
Recommended Citation
Taheri, M. (2014). Predictive microstructural evolution via localized strain dependence measurements using correlated precession diffraction and In situ TEM. In A. Bajaj, P. Zavattieri, M. Koslowski, & T. Siegmund (Eds.). Proceedings of the Society of Engineering Science 51st Annual Technical Meeting, October 1-3, 2014 , West Lafayette: Purdue University Libraries Scholarly Publishing Services, 2014. https://docs.lib.purdue.edu/ses2014/mss/mmemb/61
Predictive microstructural evolution via localized strain dependence measurements using correlated precession diffraction and In situ TEM
Although significant advances have been made in elucidating atomic-scale mechanisms that control properties of polycrystalline materials for a wide range of applications, the need for predictive understanding of material response based on crystal orientation information still exists. In this discussion, a combined approach to understanding strain-driven microstructural evolution processes using in situ transmission electron microscopy (TEM) and precession diffraction is described. Specifically, TEM-based Nanomegas DIGISTAR/ASTAR orientation mapping and precession diffraction techniques in conjunction with in situ TEM heating, strain, and irradiation will be discussed. Case studies of the advantages and drawbacks of TEM-based orientation imaging and precession diffraction during in situ TEM exploration of the stability of irradiated nanocrystalline BCC metals and strain-based twin evolution in FCC metals will be highlighted, and compared to SEM-based EBSD strain measurement techniques. The results presented will help provide a connection of the role of localized strain in developing stable materials for extreme applications.