Topic
Electron backscatter diffraction
About: Electron backscatter diffraction is a research topic. Over the lifetime, 15184 publications have been published within this topic receiving 317847 citations. The topic is also known as: EBSD.
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TL;DR: In this article, backscattered diffraction reveals the dependence of deformation twinning on grain orientation and distinct grain rotations during compression of high manganese steels, which leads to the evolution of a special microstructure and restricts the kinetics of twinning in comparison with tension deformation.
101 citations
TL;DR: In this article, the authors surveyed the features of transmission electron backscatter diffraction (EBSD) observation with a standard EBSD detector and showed that a specimen tilt angle of around 30°-40° in the opposite direction of the usual 70° and a smaller working distance in the range 4 mm-5 mm are recommended when using a s-EBSD detector.
Abstract: Features of transmission electron backscatter diffraction (EBSD) observation with a standard EBSD (s-EBSD) detector are surveyed in this study. Heavily deformed Al and 8Cr tempered martensite transmission electron microscope (TEM) specimens were used for this study. It is shown that a specimen tilt angle of ~30°–40° in the opposite direction of the usual 70° and a smaller working distance in the range 4 mm–5 mm are recommended when using a s-EBSD detector. Specimen thickness and accelerating voltage (Acc.V) have a strong affect on the quality of transmission EBSD patterns and orientation maps. Higher Acc.Vs are generally recommended to get good quality orientation maps. In case of very thin specimens, lowering the Acc.Vs will give better results. In the observation of a thin film of an 8Cr tempered martensite steel specimen, it is confirmed that t-EBSD can provide images and detailed quantitative orientation data comparable with that obtained by TEM. It is also shown that small precipitates of Cr23C6 with sizes around 30 nm could be detected and their orientations measured.
101 citations
TL;DR: In this paper, a constitutive equation was formulated for describing interdependency between deformation temperature, strain rate, flow stress and strain, and the estimated apparent activation energy (Q) ∼350 kJmol-1 for the hot deformation was approximately similar to the activation energy for diffusion of the slowest diffusing element Ni in this alloy.
101 citations
TL;DR: In this article, the effect of the local crystallographic properties on microscopic and macroscopic cracking resistance was studied in a large number of materials, including intergranular, brittle transgranular and fatigue cracking.
Abstract: Electron backscatter diffraction (EBSD) is now a well developed technique that allows for determination of 'microtexture', i.e. texture at the scale of the grain size. The effect of the local crystallographic properties on microscopic and macroscopic cracking resistance was studied in a large number of materials. Electron backscatter diffraction and EBSD related techniques provide a lot of data concerning intergranular, brittle transgranular, and fatigue cracking. In particular, they help with understanding the role of the grain boundary structure, the grain orientation and the misorientation between grains respectively. Electron backscatter diffraction characterisation of interfaces has already led to improvements of material performance in practical industrial applications, a typical example being given by grain boundary engineering. Information about the local crystallography together with a high spatial resolution encourages the application of the technique to cracking modes of other material...
101 citations
15 Feb 2007-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the evolution of the microstructure of two aluminum samples, cold rolled or annealed, is observed from the parent metal to the nugget using electron back-scattered diffraction (EBSD).
Abstract: The combination of deformation and heat in the nugget of friction stir welding (FSW) tends to transform by dynamic recrystallization the large grains of the base metal into a microstructure where the grains are completely equiaxed and strongly disorientated. To follow the different stages of dynamic recrystallization in the nugget, the evolution of the microstructure of two aluminum samples, cold rolled or annealed, is observed from the parent metal to the nugget using electron back-scattered diffraction (EBSD). The dynamic recrystallization mechanisms in each region of the weld strongly depend on the initial microstructural state of the aluminum sheet, in particular on the deformation energy stored. So, a static recrystallization prior to a continuous dynamic recrystallization was evidenced for the initially cold rolled Al alloy, while a geometric dynamic recrystallization occurred for the initially annealed microstructure. Fractions of low angle boundaries, crystallographic texture and grain size were compared in both weld nuggets.
100 citations