Measuring the Burgers vector of dislocations with dark-field X-ray microscopy

Pal, Dayeeta; Wang, Yifan; Gurunathan, Ramya; Dresselhaus-Marais, Leora

doi:10.1107/S1600576724011968

Measuring the Burgers vector of dislocations with dark-field X-ray microscopy

Journal Article · Sat Feb 01 00:00:00 EST 2025 · Journal of Applied Crystallography (Online)

DOI:https://doi.org/10.1107/S1600576724011968· OSTI ID:2574591

^[1]; ^[1]; Gurunathan, Ramya ^[2]; ^[1]

Stanford Univ., CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Independent contributor, Durham, NC (United States)

The subsurface dynamics of dislocations are essential to many properties of bulk crystalline materials. However, it is challenging to characterize a bulk crystal by conventional transmission electron microscopy (TEM) due to the limited penetration depth of electrons. A novel X-ray imaging technique – dark-field X-ray microscopy (DFXM) – was developed to image hierarchical dislocation structures in bulk crystals. While today's DFXM can effectively map the line structures of dislocations, it is still challenging to quantify the Burgers vectors, the key characterization governing the dislocation behaviors. Here, we extend the 'invisibility criterion' formalism from the TEM theory to the geometrical-optics model of DFXM and demonstrate the consistency between DFXM and dark-field TEM using multi-diffraction-peak imaging for a single edge dislocation. Due to the practical difficulty of multi-peak DFXM experiments, we further study how the Burgers vector effect is encoded for a single-peak DFXM experiment. Using the geometrical-optics DFXM simulation, we explore the asymmetry of rocking tilt scans at different rolling tilts and develop a new method to characterize the Burgers vector. The conclusions of this study advance our understanding of the use of DFXM in characterizing individual dislocations, enabling the connection from bulk DFXM imaging to dislocation mechanics.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: US Army Research Laboratory (USARL); USDOE Office of Science (SC)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 2574591

Journal Information:: Journal of Applied Crystallography (Online), Journal Name: Journal of Applied Crystallography (Online) Journal Issue: 1 Vol. 58; ISSN 1600-5767

Publisher:: International Union of CrystallographyCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
FOS: Physical sciences
Materials Science (cond-mat.mtrl-sci)
X-ray diffraction microscopy
dark-field microscopy
dislocation characterization
geometric-optics formalism
transmission electron microscopy

Measuring the Burgers vector of dislocations with dark-field X-ray microscopy

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