Table of Contents
What do pole figures show?
A pole figure is a two-dimensional graphical representation of orientation, showing the orientation of a selected plane normal (a pole) with respect to the sample reference frame. The pole is a vector in three-dimensional space.
How do you read a pole figure?
What is pole figure and Inverse pole figure?
An Inverse Pole Figure is a stereographic projection, similar to a Pole Figure. However, the principal difference is that the orientations are plotted relative to crystal axes (and not the sample axes as is the case in a Pole Figure).
What is pole in stereographic projection?
The pole is a line running through the center of the projection sphere and perpendicular to the plane (fig. 2-9). The pole forms a 90 angle with the strike line and a 90 angle with the dip line. Thus, the pole will always be found in the opposite quadrant of the stereonet from the dip of the plane.
What is IPF map?
Orientation Maps The IPF maps uses the colour from the IPF colour key, in this case the colour assigned is based on the measured orientation and the selected viewing direction. This map is good at representing preferred orientation (or texture), seen as similar or single colours in the map.
How do you read EBSD pole figures?
What is orientation distribution function?
The orientation distribution function (ODF), sometimes also called orientation density function, is a function on the orientation space that associates to each orientation g the volume percentage of crystals in a polycrystaline specimen that are in this specific orientation.
How do you plot a pole on a Stereonet?
What is texture in materials science?
In materials science, texture is the distribution of crystallographic orientations of a polycrystalline sample (it is also part of the geological fabric). … If the crystallographic orientations are not random, but have some preferred orientation, then the sample has a weak, moderate or strong texture.
What is EBSD analysis?
Electron Backscatter Diffraction (EBSD) – analysis is a very powerful tool for microstructural characterisation. Electron Backscatter Diffraction (EBSD) is a scanning electron microscope (SEM) based technique that gives crystallographic information about the microstructure of a sample.
What is a pole of a plane?
Any plane can be represented by means of a line which is perpendicular to the plane. This projects a dot on the stereogram called the pole of the plane. It’s useful in rotation or measuring the angle between two planes. Rotate the net until the point joins the equator. …
What is pole in Stereonet?
On a Pole Plot, points are plotted on a stereonet which correspond to the orientation of either (1) linear features or (2) poles representing planes: If the data is linear in nature (e.g., stress trajectories), then the corresponding point on the stereonet represents this orientation directly.
What is pole in structural geology?
The stereographic projection is a methodology used in structural geology and engineering to analyze orientation of lines and planes with respect to each other. The pole to the plane (dip pole) is at 90-degrees to the plane. …
What is the meaning of stereographic?
: of, relating to, or being a delineation of the form of a solid body (such as the earth) on a plane stereographic projection.
What are the colors for pulmonary fibrosis?
The fingers, toes, and lips of pulmonary fibrosis patients can often turn blue, which is why this was the color to represent the disease. People are encouraged to take a selfie and post it on social media using the hashtag #BlueUp4PF. Wearing a blue wig or dying your hair blue is a popular choice.
What is kernel average misorientation?
The Kernel Average Misorientation (KAM), which is easily obtained from EBSD data, is the average misorientation angle of a given point with all its neighbors. … The major drawback of estimating GND density from EBSD data is that the 3D information is calculated from a 2D measurements.
What does IPF stand for?
The most common type of PF is IPF, which stands for idiopathic pulmonary fibrosis. This means this type of PF has no known cause. Approximately 50,000 new cases of IPF are diagnosed each year. Most IPF patients first start noticing symptoms between the ages of 50 and 70 years old.
What is mud in EBSD?
In EBSD the statistical description of the intensity of a fabric is known as the multiple of uniform density (MUD) and is quantified using the maximum intensity of the contoured pole figures. A MUD of 1 indicates randomly oriented grains; a MUD significantly >1 is indicative of a fabric.
Why the specimen stage is tilted to 70 in an EBSD scan?
The EBSD sample is usually tilted at approximately 70 relative to normal incidence of the electron beam to optimise both the contrast in the diffraction pattern and the fraction of electrons scattered from the sample. For smaller tilt angles the contrast in the diffraction pattern decreases (Figure 8).
What is image quality map?
Image quality (IQ) maps constructed from electron backscatter diffraction data provide useful visualizations of microstructure. The contrast in these maps arises from a variety of sources, including phase, strain, topography, and grain boundaries.
How do you find the rake of a line on a stereonet?
What are Stereonets used for?
Stereonets are a graphical tool representing the hemisphere of a globe, used for presentation, analysis and interpretation of three-dimensional directional data such as planes and lines.
How is rake measured in geology?
In structural geology, rake (or pitch) is formally defined as the angle between a line [or a feature] and the strike line of the plane in which it is found, measured on the plane. The three-dimensional orientation of a line can be described with just a plunge and trend.
What is texture microstructure?
The orientation of crystallites in a polycrystalline material is called (crystallographic) texture. Thin films, drawn wires or rolled plates often possess a strongly preferred crystallite orientation (i.e. a texture in the narrower sense) leading to a deep impact on the material properties.
What is texture in XRD?
Texture measurements are used to determine the orientation distribution of crystalline grains in a polycrystalline sample. A material is considered textured if the grains are aligned in a preferred orientation along certain lattice planes.
What is crystal orientation?
Crystal orientation is defined by the plane (Miller) indices of the lattice plane of a crystal. In observation of an electron microscope image using a TEM, the particular crystal orientation (usually, orientation expressed by the low-order indices) is aligned to the direction of the incident electron beam.