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https://doi.org/10.1016/j.jeurceramsoc.2019.05.014
Copy DOIPublication Date: May 11, 2019 | |
Citations: 12 |
Ultra-fine Al2O3/GdAlO3 eutectics with eutectic spacing of 193 ± 20 nm are directionally solidified by laser floating zone melting process. When the solidification rate increases from 2 μm/s to 400 μm/s, the morphology transition from “Chinese script” irregular eutectic to rod-like regular eutectic is found. To predict the growth behaviour of Al2O3/GdAlO3 eutectic, the solute diffusion coefficient DL, which exhibits significant influence on eutectic growth, is determined to be 6 × 10−10 m2/s. Then, the eutectic microstructures as a function of solidification rate are well predicted by modified Magnin-Kurz model and Jackson-Hunt model, both for “Chinese script” irregular eutectic and rod-like regular eutectic, respectively.
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