Identification of sub-grains and low angle boundaries beyond the angular resolution of EBSD maps

Abstract

A new method called ALGrId (Anti-Leak GRain IDentification) is proposed for the detection of sub-grains beyond the relative angular resolution of Electron Backscatter Diffraction maps. It does not use any additional information such as Kikuchi Pattern Quality map nor need data filtering. It uses a modified Dijkstra algorithm which seeks the continuous set of boundaries having the highest average disorientation angle.

Unified description of the softening behavior of beta-metastable and alpha+beta titanium alloys during hot deformation

“…Sometimes domains inherited from different parent may have a disorientation angle lower than 3°. To ensure a correct identification of domains, the Anti-Leak Grain Identification (ALGrId) [28] was applied using a disorientation angle threshold of 0.2°. In the second step, each domain and its first neighbors are considered.…”

Microtexture of Ti6Al4V Obtained by Direct Energy Deposition (DED) Process

“…The reconstruction procedure is similar to that described by Germain and coworkers [13] and is performed in three steps. In a first step, crystallographic domains (grains) are identified using an Anti-Leak Grain detection [14] with 0 =3° and 1 =0°. In a second step, neighboring domains related by the Burgers orientation relationship (with a 3° tolerance) to a common parent orientation are sought.…”

Influence of strain conditions on the grain sub-structuration in crept uranium dioxide pellets

“…The result of this calculation gives the density distribution of GNDs over the EBSD mapped region from which the average density of GND's can be evaluated. (3) The sub-grains delimited by low disorientation boundaries were detected by an advanced sub-grain detection procedure [14,24] and the evolution of their average size according to the strain level was quantified. The classical EBSD grain recognition procedure clusters pixels disoriented from their neighbors by less than a threshold angle u 0 .…”

“…In addition, Accurate-ECCI experiments were also performed to image the dislocations induced by creep and their arrangement in very low sub-grain boundaries [22,23]. Moreover, an advanced sub-grain completion procedure was applied to the EBSD data to quantify the sub-grain size evolution [24]. Finally, Geometrically Necessary Dislocations (GNDs) densities were calculated using the ATEX software [14,25].…”