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Investigation of the solidification behavior of Al2O3/YAG/YSZ ceramic in situ composite with off-eutectic composition by Haijun Su; Jun Zhang; Kan Song; Lin Liu; Hengzhi Fu is a Materials Science article available to read on EtoBox.

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Directionally solidified Al 2 O 3 /YAG/YSZ ceramic in situ composite is an interesting candidate for the manufacture of turbine blade because of its excellent mechanical property. In the present study, two directionally solidified hypoeutectic and hypereutectic Al 2 O 3 /YAG/YSZ ceramic in situ composites are prepared by laser zone remelting, aiming to investigate the solidification behavior of the ternary composite with off-eutectic composition under high-temperature gradient. The results show that the composition and laser scanning rate significantly influence the solidification microstructure. The ternary in situ composite presents ultra-fine microstructure, and the eutectic interspacing is refined with the increase of the scanning rate. The Al 2 O 3 /YAG/YSZ hypoeutectic ceramic displays an irregular hypoeutectic network structure consisting of a primary Al 2 O 3 /YAG binary eutectic and fine Al 2 O 3 /YAG/YSZ ternary eutectic. Only at low scanning rate, homogeneous ternary eutectic-like microstructures are obtained in the hypoeutectic composition. Meanwhile, the Al 2 O 3 /YAG/YSZ hypereutectic ceramic shows homogeneous eutectic-like microstructure in most cases and the eutecti

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Author

Haijun Su; Jun Zhang; Kan Song; Lin Liu; Hengzhi Fu

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0955-2219)

Published

2011

Language

EN

Field

Materials Science (Physical Sciences)