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Characterizing α-phase variants in titanium alloys via EBSD: Understanding colour indexing challenges
1Centre for Additive Manufacturing, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia.
Micron (Oxford, England : 1993)
|August 8, 2025
Summary
Electron Backscatter Diffraction (EBSD) inverse pole figure (IPF) maps can obscure titanium alloy phase variants due to color overlap. This study clarifies EBSD coloring of alpha variants, aiding accurate microstructural analysis and material design.
Area of Science:
- Materials Science
- Metallurgy
- Crystallography
Background:
- Electron Backscatter Diffraction (EBSD) with inverse pole figure (IPF) maps is crucial for visualizing grain orientations in titanium alloys.
- Identifying the twelve alpha-phase variants from the beta to alpha transformation, governed by the Burgers orientation relationship, is challenging in IPF maps due to color overlaps.
Purpose of the Study:
- To systematically investigate the coloring of alpha-phase variants in EBSD IPF X, Y, and Z maps.
- To explain the reasons behind similar colors for multiple variants in IPF maps.
- To correlate IPF map color distributions with Schmid factors for slip systems.
Main Methods:
- Utilized a Ti-6Al-2Sn-4Zr-2Mo alloy sample fabricated via laser-based directed energy deposition.
- Analyzed orientations of prior-beta grains and their alpha-phase variants using the Burgers orientation relationship.
- Explored the relationship between IPF map color distributions and Schmid factors for basal, prismatic, and pyramidal slip.
Main Results:
- Illustrated why multiple alpha-phase variants exhibit similar colors in IPF maps.
- Provided insights into the activation of slip systems and deformation behavior based on color distribution and Schmid factors.
- Clarified the representation of alpha-phase variants in IPF maps, addressing interpretation ambiguities.
Conclusions:
- Established a framework for accurate microstructural characterization of titanium alloys using EBSD.
- Highlighted the limitations of IPF map color-based analysis for distinguishing alpha variants.
- Emphasized the need for complementary techniques to overcome EBSD color limitations for improved material design.
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