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(Color online) Schematic illustration of the experimental setup of LDF for preparing DS Al2O3/YAG eutectic ceramics (a) and the photographs of the DS eutectic rod (b) and large plate (c).
Typical microstructures of the cross sections of LDF-processed Al2O3/YAG eutectics at different laser scanning rates: (a) 6 mm/min; (b) 24 mm/min. (c) The microstructure of neighbored solidification layer during LDF grown at 12 mm/min. (d) The relationship between the eutectic spacing and laser scanning rate.
Regular eutectic growth morphologies observed in the LDF-processed Al2O3/YAG eutectic: (a) lamellae structure; (b) rod structure; (c) and (d) showing the transition of lamellae to rods and the transition of irregular “Chinese-script” to regular lamellae, respectively.
The physical model of the eutectic growth of the faceted Al2O3/YAG based on the atom cluster elementary process.
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