Abstract
Abstract Direct observation of partial dislocations with weak beam transmission electron microscopy has become a popular method of characterizing superdislocations in intermetallic alloys. This paper focuses attention on the details that are required to perform and quantify weak beam observations. More specifically, it relates the formation of a weak beam image with the displacement field of the dislocation and the diffraction conditions that are used to create it. The isotropic correction of Cockayne, Ray and Whelan, developed for measuring precise values of partial dislocation spacing, has been revisited, and comparisons between calculations employing anisotropic elasticity and image simulations are used to highlight the differences that exist between this method and the shifts predicted by image simulations. Although small for fcc metals, this difference has been found to be much larger for intermetallic alloys. Image simuations have also been employed to stress the fact that experimental observations,...
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
