Multiscale in-situ characterization of static recrystallization using dark-field X-ray microscopy and high-resolution...

Area of Science:

• Materials Science
• Crystallography
• Materials Engineering

Background:

• High-resolution imaging techniques like dark-field X-ray microscopy (DFXM) offer detailed insights into crystal microstructures.
• DFXM provides high spatial (~60 nm) and angular (~0.001°) resolution for elastic strain and orientation.
• A common limitation is the trade-off between resolution and field of view, necessitating complementary techniques.

Purpose of the Study:

• To combine DFXM with high-resolution X-ray diffraction (HR-XRD) for multiscale characterization.
• To investigate the in-situ static recrystallization process in a Mg-3.2Zn-0.1Ca wt.% (ZX30) alloy.
• To understand the factors driving the growth of specific grains during annealing.

Main Methods:

• Utilized dark-field X-ray microscopy (DFXM) for high-resolution imaging of individual Bragg reflections.
• Employed high-resolution X-ray diffraction (HR-XRD) to track over 8000 sub-surface grains during in-situ annealing.
• Integrated HR-XRD and DFXM to provide a multiscale analysis of microstructure evolution.

Main Results:

• Successfully tracked the volume changes of numerous sub-surface grains during in-situ annealing.
• Identified specific grains that grew to consume a large volume fraction of the annealed microstructure.
• Demonstrated the effectiveness of combining HR-XRD and DFXM for analyzing small or highly deformed grains.

Conclusions:

• The combined HR-XRD and DFXM approach enables comprehensive multiscale characterization of material behavior.
• This technique pairing is crucial for understanding grain growth dynamics in complex microstructures.
• The study provides insights into the mechanisms governing static recrystallization and grain selection in magnesium alloys.