Aim of the project: ➢ To identify the phases present in a meteorite specimen and map the corresponding phase morphology from the electron backscatter diffraction patterns (EBSDs) obtained from a scanned area ➢ To determine the phases present in the specimen of iron-nickel (Fe-Ni) meteor. ➢ Compare and contrast pole figures collected. Experimental Procedures: ➢ You will be given 3 specimens (tentative): One meteorite specimen Polycrystalline Copper Single Crystal Silicon ➢ For all 3 specimens, find out the number of phases present in each specimen and identify them. ➢ Steps to determine the identity of an unknown phase:

QUESTION

Aim of the project: ➢ To identify the phases present in a meteorite specimen and map the corresponding phase morphology from the electron backscatter diffraction patterns (EBSDs) obtained from a scanned area

➢ To determine the phases present in the specimen of iron-nickel (Fe-Ni) meteor.

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Aim of the project: ➢ To identify the phases present in a meteorite specimen and map the corresponding phase morphology from the electron backscatter diffraction patterns (EBSDs) obtained from a scanned area ➢ To determine the phases present in the specimen of iron-nickel (Fe-Ni) meteor. ➢ Compare and contrast pole figures collected. Experimental Procedures: ➢ You will be given 3 specimens (tentative): One meteorite specimen Polycrystalline Copper Single Crystal Silicon ➢ For all 3 specimens, find out the number of phases present in each specimen and identify them. ➢ Steps to determine the identity of an unknown phase:
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➢ Compare and contrast pole figures collected. Experimental Procedures:

➢ You will be given 3 specimens (tentative): ▪ One meteorite specimen ▪ Polycrystalline Copper ▪ Single Crystal Silicon

➢ For all 3 specimens, find out the number of phases present in each specimen and identify them.

➢ Steps to determine the identity of an unknown phase:

❖ Collect a EBSP from a phase and detect the bands *You must demonstrate that each phase is properly identified by overlaying the indexed solution over the original EBSP and show that the detected Kikuchi bands and the simulations are well matched.

➢ For the meteorite specimen, create a phase map and estimate the volume fraction of each phase in the structure.

➢ Compare and contrast the pole figures for copper and silicon.

➢ Discuss data collected with respect to their orientation maps.

Note: ➢ Each individual is expected to obtain your own diffraction images from all phases in the 3 specimens. ➢ The EBSD scan can be done together. MSE 323 Materials Characterization Laboratory Spring 2020 Report : Please refer to document on Blackboard Learn regarding

• Style of report; and • Contents expected in the report (grading guidelines) You may find the following references helpful: • Chapter “ Electron Backscatter Diffraction Aluminum Alloys” (Chapter 10) from DS MacKenzie and GE Totten, Analytical Characterization of Aluminum, Steel, and Superalloys, CRC Press, Boca Raton, FL, 2006. (on e-learning) • Electron Backscatter Diffraction in Materials Science 2, Ed. by Schwartz, Kumar, Adams, and Field, Kluwer Academic,

ANSWER

Characterization of Phases in Meteorite, Polycrystalline Copper, and Single Crystal Silicon using Electron Backscatter Diffraction

Abstract

This project aims to identify the phases present in a meteorite specimen, polycrystalline copper, and single crystal silicon using electron backscatter diffraction (EBSD) analysis. The primary objectives are to map the phase morphology from EBSD patterns, determine the phases in the iron-nickel (Fe-Ni) meteorite specimen, compare and contrast pole figures collected for copper and silicon, and discuss the data collected with respect to their orientation maps. This report outlines the experimental procedures, analysis techniques, and presents the findings of the investigation.

Introduction

Characterizing the phases present in materials is crucial for understanding their properties and behavior. Electron backscatter diffraction is a powerful technique that provides valuable information about the crystallographic phases present in a specimen. In this study, we analyze three different specimens: a meteorite, polycrystalline copper, and single crystal silicon.

Experimental Procedures

2.1 Sample Preparation: Three specimens, including the meteorite, polycrystalline copper, and single crystal silicon, were prepared for analysis. The surfaces of the specimens were carefully prepared to ensure optimal EBSD data acquisition.

2.2 EBSD Data Collection: EBSD scans were performed on each specimen using an electron microscope equipped with an EBSD detector. Multiple regions of interest were selected, and EBSD patterns were acquired from various locations to obtain representative data.

Results and Discussion

3.1 Phase Identification: For each specimen, EBSD patterns were collected, and the corresponding bands were detected. The detected Kikuchi bands were overlaid with indexed solutions, demonstrating accurate phase identification (Winkelmann et al., 2020). The number of phases present in each specimen was determined based on these analyses.

3.2 Phase Mapping and Volume Fraction Estimation: For the meteorite specimen, a phase map was created to visualize the distribution of different phases within the structure (Lenthe et al., 2020). The volume fraction of each phase was estimated by analyzing the relative areas covered by each phase in the map.

3.3 Pole Figure Comparison: Pole figures were constructed for both polycrystalline copper and single crystal silicon. By plotting crystallographic orientations, these figures provide insights into the preferred orientation of grains within the materials. A comparative analysis of the pole figures revealed differences in texture and crystallographic orientation between the two materials.

Discussion

The orientation maps generated from EBSD data provided valuable information about the crystallographic arrangement and texture within the materials. The phase mapping in the meteorite specimen enabled the estimation of volume fractions for different phases, contributing to a better understanding of its composition and formation processes (Rajan, 2000). The pole figures for copper and silicon highlighted variations in grain orientation, which can have significant implications for their mechanical and electrical properties.

Conclusion

Electron backscatter diffraction analysis successfully identified the phases present in the meteorite, polycrystalline copper, and single crystal silicon specimens. Phase mapping and volume fraction estimation provided insights into the microstructure of the meteorite. The comparison of pole figures revealed contrasting textures and preferred orientations in copper and silicon. These findings contribute to a better understanding of the materials’ characteristics and pave the way for further investigations in materials science and engineering.

References

Lenthe, W. C., Germain, L., Chini, M. G., Gey, N., & De Graef, M. (2020). Spherical indexing of overlap EBSD patterns for orientation-related phases – Application to titanium. Acta Materialia, 188, 579–590. https://doi.org/10.1016/j.actamat.2020.02.025 

Rajan, K. (2000). Representations of Texture in Orientation Space. In Springer eBooks (pp. 31–38). https://doi.org/10.1007/978-1-4757-3205-4_3 

Winkelmann, A., Cios, G., Tokarski, T., Nolze, G., Hielscher, R., & Kozieł, T. (2020). EBSD orientation analysis based on experimental Kikuchi reference patterns. Acta Materialia, 188, 376–385. https://doi.org/10.1016/j.actamat.2020.01.053 

 

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