Electron backscatter diffraction

Electron backscatter diffraction (EBSD) is a scanning electron microscopy (SEM) technique used to study the crystallographic structure of materials. EBSD is carried out in a scanning electron microscope equipped with an EBSD detector comprising at least a phosphorescent screen, a compact lens and a low-light camera. In this configuration, the SEM incident beam hits the tilted sample. As backscattered electrons leave the sample, they interact with the crystal's periodic atomic lattice planes and diffract according to Bragg's law at various scattering angles before reaching the phosphor screen forming Kikuchi patterns (EBSPs). EBSD spatial resolution depends on many factors, including the nature of the material under study and the sample preparation. Thus, EBSPs can be indexed to provide information about the material's grain structure, grain orientation, and phase at the micro-scale. EBSD is applied for impurities and defect studies, plastic deformation, and statistical analysis for av

About this result

This page is automatically generated and may contain information that is not correct, complete, up-to-date, or relevant to your search query. The same applies to every other page on this website. Please make sure to verify the information with EPFL's official sources.

Related publications (58)

Related publications

Related people (8)

Related people

Related units (5)

Related units

Related concepts (5)

Related concepts

Related courses (13)

Related courses

Related lectures (25)

Related lectures

MSE-352: Introduction to microscopy + Laboratory work

Ce cours d'introduction à la microscopie a pour but de donner un apperçu des différentes techniques d'analyse de la microstructure et de la composition des matériaux, en particulier celles liées aux microscopies électronique et optique. Le cours comprend des cours ainsi que des démonstrations.

PHYS-405: Experimental methods in physics

The course's objectivs are: Learning several advenced methods in experimental physics, and critical reading of experimental papers.

PHYS-309: Solid state physics I

This lecture gives an introduction to Solid State Physics, namely to their crystal and electronic structure, their magnetic properties, as well as to their thermal and electric conductance. The level is that of the book by Ashcroft & Mermin. The lecture is for Physics Students in their 3rd year

Hot deformation of a Fe-Mn-Al-C steel susceptible of κ-carbide precipitation

Roland Logé, Oscar Zambrano Zambrano

The mechanical properties of Fe-Mn-Al-C steel are significantly enhanced after κ-carbide precipitation via aging; however, most aging treatments are energy demanding because they require relatively high temperatures and extended holding times. This research determined that the precipitation of these carbides can also occur within a few seconds of thermomechanical treatments (TMTs). This behaviour has not been reported post-TMTs for this steel group. Hot compression tests were performed on Fe-21Mn-11Al-1.5C-2Si wt% specimens at test temperatures ranging from 900 °C to 1150 °C and strain rates varying from 0.01 s−1 to 1 s−1. The effects of strain rate and test temperature on dynamic recrystallization behaviour were evaluated. The microstructures were characterized by scanning electron microscope and electron backscatter diffraction. Hardness tests were performed before and after applying processes studied i.e., TMT and aging treatment to determine the change in hardness induced. Particularly, nanoindentation tests were also used to collect indirect evidence about the deformation mechanisms. The load-displacement curves P-h and (P/h)-h showed the occurrence of several popins and slope changes related to the nucleation of dislocations and strain-induced phase transformations. The occurrence of these phenomena is discussed.

Elsevier Science Sa2017

Microstructural Evolution Study of Fe-Mn-Al-C Steels Through Variable Thermomechanical Treatments

Roland Logé, Oscar Zambrano Zambrano

The microstructural evolution of the two austenitic alloys Fe-20Mn-3Al-0.7C wt pct and Fe-20Mn-6Al-0.7C wt pct when different thermal and thermomechanical treatments are performed has been studied. To this end, a generic industrial die of 100 ton capacity and a Gleeble 3800 simulator were selected to perform the thermomechanical treatments. A solubilization treatment was carried out at 1100 degrees C for 4 days for the two alloys in as cast state. In addition, the specimens deformed with the industrial die underwent a solubilization treatment at 1100 degrees C for 4 hours. Microstructural characterizations were performed by X-ray diffraction, transmission Mossbauer spectrometry, and electron backscatter diffraction. The results showed both the formation of different austenites rich and poor in solute atoms, as well as different microstructures, as a function of the treatments performed, which affected the resulting dynamically recrystallized microstructures. Notably, it was observed that it is possible to explain and relate the evolution of the microstructure to the hyperfine parameters resulting from fitting the Mossbauer spectra. In particular, the relationship between the degree of dynamic recrystallization and the evolution of an ordered austenitic structure is discussed.

SPRINGER2021

Orientation selection in dendritic evolution

Michel Rappaz

Computational and experimental demonstration of dendritic crystal growth direction and the morphologic diversity of the resulting dendritic structures are discussed. The primary dendrite growth directions can vary continuously between different crystallographic directions as a function of the composition-dependent anisotropy parameters. The dendritic microstructure of chemically etched and electropolished longitudinal sections of solidified alloys was analyzed using scanning electron microscopy and electron back-scattered diffraction (EBSD) orientation measurements. The experimental results shows the change of dendritic growth direction of compositions as a function of anisotropy in the phase-field simulation. The similarities between the computational and the experimental results strongly supports the hypothesis that the change of anisotropy parameters with the composition is the underlying mechanism of the damage of growth direction observed experimentally.

2008

Texture (chemistry)

In physical chemistry and materials science, texture is the distribution of crystallographic orientations of a polycrystalline sample (it is also part of the geological fabric). A sample in which the

Crystallography

Crystallography is the experimental science of determining the arrangement of atoms in crystalline solids. Crystallography is a fundamental subject in the fields of materials science and solid-sta

Electron diffraction

Electron diffraction refers to changes in the direction of electron beams due to interactions with atoms. Close to the atoms the changes are described as Fresnel diffraction; far away they are calle