In situ Transmission Electron Microscopy Investigation of Dislocation Interactions
This chapter provides a broad overview of dislocation interactions investigated via in situ transmission electron microscopy (TEM) deformation experiments. The discussion of these interactions is divided according to the interaction of interest, with the first section exploring the mechanics and energetics governing dislocation nucleation, propagation, and multiplication. The following two sections investigate dislocation interactions with isolated defects and defect fields, including interactions involving irradiation-induced defects, solute atoms, and second-phase particles. The final section discusses dislocation–grain boundary interactions with a focus on understanding how the local grain boundary structure and surrounding microstructure dictate the dislocation transfer process. Two unique advantages of TEM imaging for dislocation interactions will be highlighted throughout this chapter: the ability to capture dislocation interactions at sufficient spatial and temporal resolution to resolve complex interactions, and the ability to resolve salient features of the dislocation interactions using diffraction contrast imaging. This second advantage is used to characterize structural and geometrical factors influencing dislocation interactions, including the dislocation Burgers vector, line direction, and slip plane, crystallographic orientation, and boundary habitat planes.
KeywordsTransmission electron microscopy In situ deformation Dislocations Plasticity Strengthening mechanisms
For the preparation of this manuscript, the authors acknowledge financial support from Georgia Tech. (JK), Los Alamos National Security, LLC, operator of the Los Alamos National Laboratory under Contract No. DE-AC52-06NA25396 with the US Department of Energy (BPE), and US Department of Energy under award No. DE-FG02–08 ER46525 (IMR). Experimental work from the Robertson group was supported by US Department of Energy, Office of Basic Energy Sciences, Division of Materials Science, under award No. DE-FG02–08 ER46525 (radiation damage work by Cui) and US Department of Energy Office of Basic Energy Sciences, Division of Materials Science, under award No. DEFG-02-07ER46443 (slip transfer studies by Kacher and, partially, the study by Eftink on deformation across interfaces).
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