Calculating dislocation density from EBSD data involves a number of steps. Here is a general outline of the process:
1. Collect EBSD data: EBSD (Electron Backscatter Diffraction) data can be collected using an SEM (Scanning Electron Microscope) equipped with a special detector. This data provides information about the crystallographic orientation of the grains in the material, as well as information about the boundaries between the grains.
2. Determine grain size: Using the EBSD data, the average grain size can be determined using standard image analysis techniques.
3. Measure misorientation angles: Using the EBSD data, the misorientation angle between adjacent grains can be measured.
4. Use dislocation density equation: The dislocation density can be calculated using the following equation:
ρ = 1/(2b) * (ΣΔθ/l)
where ρ is the dislocation density, b is the Burgers vector (a characteristic vector that describes the size and direction of a dislocation), ΣΔθ is the sum of the misorientation angles between adjacent grains, and l is the average grain size.
5. Calculate dislocation density: Using the values obtained in steps 2, 3, and 4, the dislocation density can be calculated.
I hope that's helpful Hamza Osman Abdelhadi
Thank you M. Janane Allah for that helpful answer.
Can you send me the references, please?
I have another question:
How can I measure misorientation angles from EBSD data?
If you have videos, send me, please
Thank you very much.
With great pleasure Hamza Osman Abdelhadi , I am delighted to be able to assist you. Allow me to present you with some references that could prove useful in your research or project. These references have been carefully selected to provide relevant and in-depth information on the subject that interests you. Feel free to consult and utilize them to aid you in your endeavor.
Birosca, S. (2018). Crystallographic Orientation Relationship with Geometrically Necessary Dislocation Accumulation During High-Temperature Deformation in RR1000 Nickel-Based Superalloy. Metallurgical and Materials Transactions A.
Steiner, M., Mccabe, R., Garlea, E., & Agnew, S. (2017). Monte Carlo modeling of recrystallization processes in α-uranium. Journal of Nuclear Materials.
Weaver, J., Livescu, V., & Mara, N. (2019). A comparison of adiabatic shear bands in wrought and additively manufactured 316L stainless steel using nanoindentation and electron backscatter diffraction. Journal of Materials Science.
Zheng, J., Pruncu, C., Zhang, K., Zheng, K., & Jiang, J. (2021). Quantifying geometrically necessary dislocation density during hot deformation in AA6082 Al alloy. Materials Science and Engineering A-structural Materials Properties Microstructure and Processing.
Field, D., Merriman, C., & Mastorakos, I. (2010). Two- and Three-Dimensional EBSD Measurement of Dislocation Density in Deformed Structures. Solid State Phenomena.
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