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The research aims to explore crystal growth dynamics and dislocation formation in pure metals and alloys using x-ray topography.

April 1, 2026Open Access

Dynamical studies of microstructural changes of crystals by real time x-ray topography

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Dynamical studies reveal crystal growth behaviors and dislocation origins in aluminum and alloys, suggesting modifications to existing theories.

The research aims to explore crystal growth dynamics and dislocation formation in pure metals and alloys using x-ray topography.
Utilized an ultra high intensity x-ray generator and Lang-type camera for real-time imaging.
Investigated the growth of pure aluminum, gallium, and aluminum-magnesium alloys.
Monitored changes in dislocation density and crystal microstructure during growth.
Faceted growth was observed in gallium but not in aluminum, with dislocation-free regions near the solid-liquid interface.
Dislocations were generated when advancing the interface and during growth rate changes.
The study suggests that Jackson's theory needs modifications to account for influences from second nearest neighbor atoms.
In aluminum-magnesium alloys, the angle between dendritic arms varied with growth rate and solute content.
Thermal cyclic annealing effectively reduced dislocation density across different crystal types.

Imura et al. (1988) studied this question.

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Dynamical studies reveal crystal growth behaviors and dislocation origins in aluminum and alloys, suggesting modifications to existing theories.