Polychromatic X-ray microdiffraction studies of mesoscale structure and dynamics

Area of Science:

• Materials Science
• Crystallography
• Physics

Background:

• Mesoscale structure and dynamics are critical for material properties.
• Characterizing these features non-destructively is challenging.
• Advanced X-ray techniques are needed for detailed analysis.

Purpose of the Study:

• To describe the theory, instrumentation, and applications of polychromatic X-ray microdiffraction.
• To highlight its capabilities in mapping 3D mesoscale structure and strain.
• To demonstrate its utility in characterizing material microstructures.

Main Methods:

• Utilizing polychromatic X-ray microdiffraction for 3D mapping.
• Employing differential-aperture depth profiling for subsurface analysis.
• Combining with monochromatic measurements for complete strain tensor determination.

Main Results:

• High spatial and angular resolution achieved for mapping crystalline phase, orientation, and strain.
• Elastic strain tensor elements measurable to approximately 10(-4) or better.
• 3D mapping of crystalline morphology, including grain boundaries and second phases, with sub-micrometric resolution.

Conclusions:

• Polychromatic X-ray microdiffraction is a versatile tool for mesoscale analysis.
• It enables detailed, non-destructive characterization of material structure and strain.
• The technique is valuable for understanding material behavior and properties.