Orientation inhomogeneities within individual grains in cold-rolled aluminium resolved by electron backscatter diffraction

2008 ◽  
Vol 483-484 ◽  
pp. 668-671 ◽  
Author(s):  
W. Pantleon ◽  
W. He ◽  
T.P. Johansson ◽  
C. Gundlach
Keyword(s):  
Electron Backscatter Diffraction ◽  
Electron Backscatter ◽  
Cold Rolled ◽  
Individual Grains ◽  
Backscatter Diffraction

Characters of Coarse Grains Subdivisions in Rolled Polycrystalline Al

2007 ◽  
Vol 546-549 ◽  
pp. 1033-1036
Author(s):  
Qi Ping Hu ◽  
Yong Zhang ◽  
Yun Lai Deng
Keyword(s):  
High Purity ◽  
Electron Backscatter Diffraction ◽  
Coarse Grains ◽  
Electron Backscatter ◽  
Columnar Grains ◽  
Cold Rolled ◽  
Ebsd Technique ◽  
The Individual ◽  
Individual Grains ◽  
Backscatter Diffraction

Deformation microstructures and micro-orientations of columnar grains with different orientations in a polycrystalline high purity Al cold-rolled up to 65% (thickness reduction) were investigated using electron backscatter diffraction (EBSD) technique. It was found that rotations were Inhomogeneous within the individual grains, the rotation angles of the parts close to the initial boundaries (BPs) were smaller than those remote from the boundaries (IPs), e.g. the deviation angles between the BPs and the IPs were 5-6° in the grains with <001>//RD orientation, leading to the rotation along the α-fiber, while the deviation angles were 5-12° in the grains with <121>//ND orientation rotating toward the β-fiber. These results demonstrated that the microstructures and local rotations of various parts within the rolled individual columnar grains were influenced by their initial orientations and boundaries.

Use of Electron Backscatter Diffraction Technique in Characterization of 6XXX Aluminum Alloy Extrusions

2000 ◽  
Vol 6 (S2) ◽  
pp. 954-955
Author(s):  
Steven R. Claves ◽  
Wojciech Z. Misiolek ◽  
William H. Van Geertruyden ◽  
David B. Williams
Keyword(s):  
Electron Backscatter Diffraction ◽  
Metal Flow ◽  
Extrusion Process ◽  
Cross Sectional ◽  
Electron Backscattering Diffraction ◽  
Electron Backscatter ◽  
Individual Grains ◽  
Backscatter Diffraction ◽  
6Xxx Series

Electron Backscattering Diffraction (EBSD) is an important tool for analyzing the crystal grain orientation of a microstructure and can be used to formulate conclusions about microtexture, texture determined from individual grains. This technique has been used to study a 6xxx series aluminum alloy's response to the deformation of the extrusion process. Extrusion is the process by which a billet of material is forced, under high pressure, through a die. The material undergoes a significant decrease in cross sectional area, and is formed into a shape equivalent to the geometry of the die orifice. Different bearing lands are shown in shown in Figure 1. These surfaces form the part, and are designed to control the metal flow making it uniform through the die, thus yielding good mechanical properties. This research was focused on the resultant microstructure. The shaded regions of Figure 2 show the two surface regions where EBSD measurements were taken.

Angular Precision of Automated Electron Backscatter Diffraction Measurements

2011 ◽  
Vol 702-703 ◽  
pp. 548-553 ◽  
Author(s):  
Stuart I. Wright ◽  
Jay A. Basinger ◽  
Matthew M. Nowell
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Hough Transform ◽  
Angular Resolution ◽  
Electron Backscatter Diffraction ◽  
Electron Backscatter ◽  
Individual Grains ◽  
Backscatter Diffraction ◽  
Work First ◽  
Scanning Electron

Electron backscatter diffraction (EBSD) has become the preferred technique for characterizing the crystallographic orientation of individual grains in polycrystalline microstructures due to its ability to rapidly measure orientations at specific points in the microstructure at resolutions of approximately 20-50nm depending on the capabilities of the scanning electron microscope (SEM) and on the material being characterized. Various authors have studied the angular resolution of the orientations measured using automated EBSD. These studies have stated values ranging from approximately 0.1° to 2° [1-6]. Various factors influence the angular resolution achievable. The two primary factors are the accuracy of the detection of the bands in the EBSD patterns and the accuracy of the pattern center (PC) calibration. The band detection is commonly done using the Hough transform. The effect of varying the Hough transform parameters in order to optimize speed has been explored in a previous work [6]. The present work builds upon the earlier work but with the focus towards achieving the best angular resolution possible regardless of speed. This work first details the methodology used to characterize the angular precision then reports on various approaches to optimizing parameters to improve precision.

Application of FIB-EBSD Tomography for Understanding Annealing Phenomena in a Cold Rolled Particle-Containing Nickel Alloy

2007 ◽  
Vol 558-559 ◽  
pp. 413-418 ◽  
Author(s):  
Wan Qiang Xu ◽  
Michael Ferry ◽  
Julie M. Cairney ◽  
John F. Humphreys
Keyword(s):  
Nickel Alloy ◽  
Focused Ion Beam ◽  
Electron Backscatter Diffraction ◽  
Ion Beam ◽  
Serial Sectioning ◽  
Dual Beam ◽  
Electron Backscatter ◽  
Cold Rolled ◽  
Twin Formation ◽  
Backscatter Diffraction

A typical dual-beam platform combines a focused ion beam (FIB) microscope with a field emission gun scanning electron microscope (FEGSEM). Using FIB-FEGSEM, it is possible to sequentially mill away > ~ 50 nm sections of a material by FIB and characterize, at high resolution, the crystallographic features of each new surface by electron backscatter diffraction (EBSD). The successive images can be combined to generate 3D crystallographic maps of the microstructure. A useful technique is described for FIB milling that allows the reliable reconstruction of 3D microstructures using EBSD. This serial sectioning technique was used to investigate the recrystallization behaviour of a particle-containing nickel alloy, which revealed a number of features of the recrystallizing grains that are not clearly evident in 2D EBSD micrographs such as clear evidence of particle stimulated nucleation (PSN) and twin formation and growth during PSN.

Influence of Crystallography on Nucleation of Ferrite Precipitates at Austenite Grain Boundary Corners in a Co-15Fe Alloy

2011 ◽  
Vol 172-174 ◽  
pp. 378-383
Author(s):  
Guo Hong Zhang ◽  
Tomoaki Takeuchi ◽  
Masato Enomoto ◽  
Yoshitaka Adachi
Keyword(s):  
Grain Boundary ◽  
Electron Backscatter Diffraction ◽  
Major Influence ◽  
Austenite Grain ◽  
Electron Backscatter ◽  
The Matrix ◽  
Triple Points ◽  
Individual Grains ◽  
Austenite Grain Boundary ◽  
Backscatter Diffraction

The nucleation of bcc ferrite precipitates at austenite grain corners in a Co-15Fe alloy was studied by serial sectioning coupled with electron backscatter diffraction (EBSD) analysis. Grain corners were identified by recombination of triple points and triangular annihilation, whereas quite a few precipitates were surrounded by more than four matrix grains when twins were counted as individual grains. More than 40% of corners composed all of high angle grain boundaries were vacant at an undercooling of ~60°C from the g/(a+g) phase boundary. All the precipitates had K-S or N-W orientation relationship with at least one grain and a larger proportion of them had the OR with two and three grains. For half of vacant corners a hypothetical precipitate could have the OR with more than one grain. It is likely that not only the misorientations among the matrix grains, but also the orientations of the grain boundary planes have a major influence on nucleation potency even at grain corners.

scholarly journals Effects of Widening during Rolling on the Subsequent Recrystallization Kinetics of Copper

2013 ◽  
Vol 753 ◽  
pp. 285-288
Author(s):  
Feng Xiang Lin ◽  
Torben Leffers ◽  
Wolfgang Pantleon ◽  
Dorte Juul Jensen
Keyword(s):  
Recrystallization Texture ◽  
Electron Backscatter Diffraction ◽  
Cube Texture ◽  
Recrystallization Process ◽  
Recrystallization Kinetics ◽  
Two Samples ◽  
Electron Backscatter ◽  
Cold Rolled ◽  
Backscatter Diffraction ◽  
Kinetics Of

Recrystallization kinetics in copper cold-rolled to 90% reduction with and without significant widening was investigated by electron backscatter diffraction. It was found that the recrystallization process was slightly retarded and the development of cube recrystallization texture was largely inhibited in the widening sample. Cube grains were observed to have a growth advantage by a factor of 2 in the non-widening sample, while this growth advantage was not observed in the widening sample. The recrystallization kinetics and the development of cube texture in the two samples are discussed.

Determination of Dislocation Density in Lath Martensite by Means of Electron Backscatter Diffraction

2017 ◽  
Vol 885 ◽  
pp. 275-279 ◽  
Author(s):  
Péter János Szabó ◽  
András Csóré
Keyword(s):  
Dislocation Density ◽  
Martensitic Steel ◽  
Electron Backscatter Diffraction ◽  
Lath Martensite ◽  
Electron Backscatter ◽  
Density Values ◽  
Cold Rolled ◽  
Backscatter Diffraction ◽  
Scanning Electron

As a novel procedure for determining dislocation density, a software was improved with which data obtained by Scanning Electron Microscope (SEM) measurements can be collected and the value of superficial dislocation density can be calculated. Applying this method we investigated cold rolled lath martensitic steel samples. Besides dislocation density values, microstructure mapped by Electron Backscatter Diffraction (EBSD) will be discussed.

Grain Boundary Self-Diffusion in Nickel

2007 ◽  
Vol 263 ◽  
pp. 207-212 ◽  
Author(s):  
Vĕra Rothová ◽  
Jiří Buršík ◽  
Milan Svoboda ◽  
Jiří Čermák
Keyword(s):  
Grain Boundary ◽  
Grain Orientation ◽  
Electron Backscatter Diffraction ◽  
Coincidence Site Lattice ◽  
Self Diffusion ◽  
Electron Backscatter ◽  
Cold Rolled ◽  
Backscatter Diffraction ◽  
Arrhenius Temperature ◽  
Diffusion Profiles

Grain boundary self-diffusion in both the cast and the cold-rolled Puratronic 4N5 nickel was studied in the temperature range from 600 °C to 1000 °C. The experiments were carried out with the samples pre-annealed at 1100 °C in comparison to the samples pre-annealed at intended individual diffusion temperatures. The relative grain orientation was analyzed on the same samples by means of electron backscatter diffraction (EBSD) and grain boundaries (GBs) were characterized in terms of the coincidence site lattice (CSL) model. Considering the non-linear Arrhenius temperature dependencies obtained for most specimens by using conventional method of profile evaluation in the B-type kinetics and the appearance of two high-diffusivity paths in diffusion profiles measured, a more suitable BB-type and AB-type diffusion models were applied for data evaluation.

Anisotropic Mechanical Properties of Pure Magnesium Analyzed by In Situ Nanoindentation

2015 ◽  
Vol 662 ◽  
pp. 11-14
Author(s):  
Jiří Bočan ◽  
Jan Maňák ◽  
Aleš Jäger
Keyword(s):  
Elastic Modulus ◽  
Crystallographic Orientation ◽  
Electron Backscatter Diffraction ◽  
Nanomechanical Properties ◽  
Anisotropic Mechanical Properties ◽  
Electron Backscatter ◽  
Individual Grains ◽  
Backscatter Diffraction ◽  
Scanning Electron

In this work, correlation between nanomechanical properties and crystallographic orientation of grains in 99.9 % magnesium is presented. Crystallographic orientation of individual grains was obtained by scanning electron microscope (SEM) equipped with electron backscatter diffraction (EBSD) detector. Hardness and elastic modulus of grains with known orientation were subsequently determined by in situ nanoindentation in SEM. We show that hardness decreases with increasing angle between the direction of indentation and thec-axis of grains, while elastic modulus varies non-monotonically.

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