scholarly journals On the Use of Polycrystal and Individual Orientation Texture Analysis Methods for BCC Materials

1996 ◽  
Vol 25 (2-4) ◽  
pp. 109-120 ◽  
Author(s):  
I. V. Gervasyeva ◽  
B. K. Sokolov ◽  
A. K. Sbitnev
Keyword(s):  
Texture Analysis ◽  
Secondary Recrystallization ◽  
Recrystallization Process ◽  
Etch Pits ◽  
Discrete Method ◽  
Cubic Symmetry ◽  
X Ray ◽  
Harmonic Method ◽  
Pole Figures ◽  
Orientation Density

The reliability of the harmonic method of the ODF calculation from X-ray pole figures was estimated for cubic symmetry materials. For this purpose simulated textures with a preset scattering value of the components were used. Some examples using the Roe method to the study of the secondary recrystallization process in the Fe-3% Si alloy are given. The capabilities of the etch-pits methods as the simplest discrete method used to determine the orientation density are discussed.

scholarly journals 3D immersive visualization of micro-computed tomography and XRD texture datasets

2019 ◽  
Vol 34 (2) ◽  
pp. 97-102
Author(s):  
M. A. Rodriguez ◽  
T. T. Amon ◽  
J. J. M. Griego ◽  
H. Brown-Shaklee ◽  
N. Green
Keyword(s):  
Computed Tomography ◽  
Texture Analysis ◽  
Mechanical Strain ◽  
Three Dimensional ◽  
Multidimensional Analysis ◽  
Micro Computed Tomography ◽  
X Ray ◽  
3D Data ◽  
Pole Figures ◽  
Ct Data

Advancements in computer technology have enabled three-dimensional (3D) reconstruction, data-stitching, and manipulation of 3D data obtained on X-ray imaging systems such as micro-computed tomography (μ-CT). Likewise, intuitive evaluation of these 3D datasets can be enhanced by recent advances in virtual reality (VR) hardware and software. Additionally, the generation, viewing, and manipulation of 3D X-ray diffraction datasets, such as pole figures employed for texture analysis, can also benefit from these advanced visualization techniques. We present newly-developed protocols for porting 3D data (as TIFF-stacks) into a Unity gaming software platform so that data may be toured, manipulated, and evaluated within a more-intuitive VR environment through the use of game-like controls and 3D headsets. We demonstrate this capability by rendering μ-CT data of a polymer dogbone test bar at various stages of in situ mechanical strain. An additional experiment is presented showing 3D XRD data collected on an aluminum test block with vias. These 3D XRD data for texture analysis (χ, ϕ, 2θ dimensions) enables the viewer to visually inspect 3D pole figures and detect the presence or absence of in-plane residual macrostrain. These two examples serve to illustrate the benefits of this new methodology for multidimensional analysis.

Neutron Diffraction Texture Analysis of Grain-Oriented Steel Sheets

2005 ◽  
Vol 105 ◽  
pp. 175-180 ◽  
Author(s):  
Stanislav Vratislav ◽  
Maja Dlouhá ◽  
Ladislav Kalvoda
Keyword(s):  
Neutron Diffraction ◽  
Cold Rolling ◽  
Texture Analysis ◽  
Volume Fraction ◽  
Rolling Direction ◽  
Orthorhombic Symmetry ◽  
Automatic Data ◽  
Cubic Symmetry ◽  
Steel Sheets ◽  
Pole Figures

Our laboratory developed and tested experimental and calculation techniques for quantitative texture analysis based on the ODF combined with the diffraction of thermal neutrons. In our work the texture of the Fe-3%Si sheets was investigated after different stages of their processing, i.e. hot-rolled strips, first cold rolling, first inter-annealing, second cold rolling, second annealing and secondary recrystallisation. The texture experiments were carried out on the KSN-2 diffractometer which is equipped with the TG-1 texture goniometer with automatic data collection for transmission and reflection geometry. TODFND (the cubic symmetry of the crystals and orthorhombic symmetry of the specimen) was used and the ODF values were obtained together with all texture characteristics (pole figures, inverse pole figures, ODF - f (g) values, fibre texture with <110> and <001> axis parallel to rolling direction, parameters of the ideal orientations (HKL)<uvw>, texture index J, volume fraction coefficient f. The comparison of the texture parameters of the six samples with the different technologic history is given and the magnetic anisotropy of all measured samples was determined by means of the quantitative texture analysis (ODF-the matrix Cl nµ) for all samples. Results achieved in our study confirm that the quantitative texture analysis in connection with neutron diffraction can help to improve the technology of the preparation of oriented magnetic steel sheets.

scholarly journals Texture Analysis From Incomplete Pole Figures in Low Symmetry Cases

1987 ◽  
Vol 7 (2) ◽  
pp. 115-129 ◽  
Author(s):  
F. Wagner ◽  
M. Humbert
Keyword(s):  
Computer Program ◽  
Texture Analysis ◽  
Crystal Symmetry ◽  
Harmonic Method ◽  
Pole Figures ◽  
Low Symmetry

From a classification of crystal symmetries involved in texture analysis we define a set of (low) crystal symmetries that can be similarly managed in the same computer program, using the harmonic method. A way of calculating the texture from incomplete pole figures is then proposed. Results are reported for two examples with hexagonal and trigonal crystal symmetry, respectively, and advantages and limitations of such texture analyses are discussed.

Pole Figure Measurement Plan Influence on Accuracy ODF Coefficients Determined by Modified Harmonic Method

2005 ◽  
Vol 495-497 ◽  
pp. 1693-0 ◽  
Author(s):  
Vladimir Serebryany ◽  
Sergey F. Kurtasov ◽  
T.I. Savyolova
Keyword(s):  
Statistical Method ◽  
Pole Figure ◽  
X Ray ◽  
Measurement Plan ◽  
Harmonic Method ◽  
Pole Figures ◽  
Experimental Errors ◽  
Hexagonal Metals

Influences of an X-ray experimental texture plan and of pole figure primary errors on the accuracy of the ODF coefficients are discussed. A modified harmonic method, which is a statistical method of ridge estimates, has been used for ODF restitution from pole figures. The plan of measurement of the pole figures was analysed on the basis of minimization of the primary experimental errors and the errors of the ODF restitution method. Principles of the optimum texture plan construction for hexagonal metals (magnesium example) and for the URD-6 texture diffractometer are considered.

scholarly journals An Improvement of Vector Method by Allocation of Intensities Based on the Crystallographic Symmetry

1989 ◽  
Vol 10 (2) ◽  
pp. 101-116 ◽  
Author(s):  
R. Shimizu ◽  
K. Ohta ◽  
J. Harase
Keyword(s):  
Texture Analysis ◽  
Crystal Symmetry ◽  
Residual Vector ◽  
Reflection And Transmission ◽  
Vector Method ◽  
X Ray ◽  
Textural Component ◽  
Pole Figures ◽  
Crystallographic Symmetry

An investigation has been carried out utilizing model and experimental pole figures made by X-ray technique in order to examine the use of the vector method as a means of the texture analysis. The main findings are as follows:• From crystal symmetry considerations positions and magnitudes of peaks along the ζ angle can be predicted. There are discrepancies in these intensity peaks and in some cases the peaks are missing altogether.• This problem was solved by the allocation of intensities such that equal intensities are obtained at the crystallographic symmetry positions.• Even a slightly mismatched combination of the reflection and transmission pole figures caused an increase in residual vector (R) resulting in the failure of the analysis for the minor textural component.

Estimation of Input to Plastic Deformation of Non-Crystallographic Intergranular Slip

2012 ◽  
Vol 735 ◽  
pp. 49-54
Author(s):  
Yuriy Perlovich ◽  
Margarita Isaenkova ◽  
Olga Krymskaya ◽  
Vladimir Fesenko
Keyword(s):  
Phase Diagram ◽  
Plastic Deformation ◽  
Texture Analysis ◽  
Quantitative Estimation ◽  
X Ray ◽  
Pole Figures ◽  
Crystallographic Slip ◽  
Deformation Treatment

The method was developed for quantitative estimation of inputs to plastic deformation of crystallographic and non-crystallographic modes of slip by data of X-ray texture measurements. The texture analysis allows to split material into fractions, deformed by predominant operation of crystallographic and non-crystallographic mechanisms, differing in final orientations of grains. Whereas texture maxima in pole figures correspond to grains, deformed by means of crystallographic slip and having predictable final orientations, texture minima are formed by grains, whose deformation does not submit to crystallographic regularities and therefore their orientations are deflected from stable positions or even prove to be arbitrary. These effects are demonstrated as applied to semi-products from Zr-based alloys, subjected to the deformation treatment at temperatures of the (α+β)-region of Zr-Nb phase diagram.

Use of generalised pole figures in the X-ray study of textured metal materials

2007 ◽  
Vol 2007 (suppl_26) ◽  
pp. 327-332
Author(s):  
Yu. Perlovich ◽  
M. Isaenkova ◽  
V. Fesenko
Keyword(s):  
X Ray ◽  
Pole Figures ◽  
Metal Materials

scholarly journals Spatially Resolved Forming Mechanisms Detection in Single Point Incremental Forming Using Synchrotron Based Texture Analysis

2021 ◽  
Author(s):  
Mateus Dobecki ◽  
Alexander Poeche ◽  
Walter Reimers
Keyword(s):  
Texture Analysis ◽  
Incremental Forming ◽  
Single Point ◽  
High Energy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Forming Mechanism ◽  
Spatially Resolved ◽  
Step Down ◽  
Stress States

AbstractDespite the ongoing success of understanding the deformation states in sheets manufactured by single-point incremental forming (SPIF), the unawareness of the spatially resolved influence of the forming mechanisms on the residual stress states of incrementally formed sheet metal parts impedes their application-optimized use. In this study, a well-founded experimental proof of the occurring forming mechanisms shear, bending and stretching is presented using spatially resolved, high-energy synchrotron x-ray diffraction-based texture analysis in transmission mode. The measuring method allows even near-surface areas to be examined without any impairment of microstructural influences due to tribological reactions. The depth-resolved texture evolution for different sets of forming parameters offers insights into the forming mechanisms acting in SPIF. Therefore, the forming mechanisms are triggered explicitly by adjusting the vertical step-down increment Δz for groove, plate and truncated cone geometries. The texture analysis reveals that the process parameters and the specimen geometries used lead to characteristic changes in the crystallites’ orientation distribution in the formed parts due to plastic deformation. These forming-induced reorientations of the crystallites could be assigned to the forming mechanisms by means of defined reference states. It was found that for groove, plate and truncated cone geometries, a decreasing magnitude of step-down increments leads to a more pronounced shear deformation, which causes an increasing work hardening especially at the tool contact area of the formed parts. Larger step-down increments, on the other hand, induce a greater bending deformation. The plastic deformation by bending leads to a complex stress field that involves alternating residual tensile stresses on the tool and residual compressive stresses on the tool-averted side incrementally formed sheets. The present study demonstrates the potential of high-energy synchrotron x-ray diffraction for the spatially resolved forming mechanism research in SPIF. Controlling the residual stress states by optimizing the process parameters necessitates knowledge of the fundamental forming mechanism action.

scholarly journals The Texture of a Slate From Nantlle, Caernarvon, North Wales

Texture ◽  
1972 ◽  
Vol 1 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Gerhard Oertel ◽  
Prem P. Phakey
Keyword(s):  
Ultrathin Section ◽  
Orthorhombic Symmetry ◽  
X Ray ◽  
Plane Normal ◽  
North Wales ◽  
Pole Figures ◽  
Sheet Silicate ◽  
Diffraction Patterns ◽  
Local Dissolution ◽  
Mechanical Rotation

A specimen of Cambrian slate from the slate belt in North Wales has been thinned by the ion bombardment technique to produce an ultrathin section with the specimen plane normal to the cleavage plane. This specimen has been investigated with the electron microscope by electron transmission. Selected area diffraction patterns allow identification of individual sheet silicate grains. The pole figures of the basal planes of two sheet silicate minerals, muscovite and chlorite, have been measured with an X-ray pole-figure goniometer and both show an elongated maximum normal to the slaty cleavage, with orthorhombic symmetry. While the preferred orientation could be the result of mechanical rotation of rigid flakes in a deforming matrix, the texture (the overall pattern due to the shapes and sizes of grains and their angular relations to each other) can only be explained if considerable recrystallization is assumed. It is tentatively proposed that local dissolution at points of stress-concentration with simultaneous redeposition of the dissolved material in less stressed regions may have allowed closely packed grains to act as if they were mechanically rotating rigid flakes, yet to accommodate their shapes enough to prevent interlocking.

In Situ Synchrotron X-Ray Diffraction Study of a Deformed Cu-Fe-P Alloy during Heating

2016 ◽  
Vol 850 ◽  
pp. 191-196 ◽  
Author(s):  
Wei Wang ◽  
Cun Lei Zou ◽  
Ren Geng Li ◽  
Wen Wen ◽  
Hui Jun Kang ◽  
...  
Keyword(s):  
Room Temperature ◽  
Lattice Distortion ◽  
Copper Matrix ◽  
Heating Process ◽  
Recrystallization Process ◽  
Full Width ◽  
X Ray Diffraction ◽  
Dramatic Decrease ◽  
X Ray

In situ synchrotron X-ray diffraction was used to study a deformed Cu-0.88 Fe-0.24 P alloy during heating process. The measurements were performed at room temperature and also at high temperatures up to 893 K in order to determine the recovery, ageing and recrystallization process. With the increase of temperature, the angles of copper matrix peaks moved left and the FWHM (full width at half maximum) decreased slightly. Fe3P precipitates were first detected at 533 K, reached the maximum at 673 K, and re-dissolved into matrix at 853 K. A dramatic decrease in FWHM was observed accompanied by the precipitation of Fe3P phases, indicating the reduction of lattice distortion of copper matrix.

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