EXTENDED ABSTRACT: Metals after irradiation and quenching usually contain high density of dislocation loops, which could significantly affect solute segregation, heterogeneous precipitation and hardening behaviors. Due to the projection and overlapping effects, it is hard to fully reveal geometrical and crystallographic characteristics of dislocations by utilizing the conventional transmission electron microscopy (TEM). We developed a method of tomographic crystallography of dislocations (TCDs) [1], which enables threedimensional (3D), highthroughput and integrated c h a r a c t e r i z a t i o n o f dislocations based on only one experiment. In this talk, we will show an application case of this technique to the characterization of dislocation loops in a quenched aluminum alloy, with particular focus on the loop geometry and configurations, dislocation reactions and the orientation deviation behaviors. Furthermore, by using the TCD method and correlative in-situ TEM heating technique, we reveal the variations of loop shapes and orientations at elevated temperatures, which deepens our understanding of the relationship between 3D characteristics of dislocation loops and their migration mechanisms at elevated temperatures.

Keywords：Aluminum alloys; Dislocation loops; Transmission electron microscopy; Tomographic crystallography; High throughput characterization