MICROSTRUCTURE OF Al2O3/YAG/ZrO2 HYPEREUTECTIC ALLOY DIRECTIONALLY SOLIDIFIED BY LASER FLOATING ZONE METHOD

doi:10.3724/SP.J.1037.2011.00594

Acta Metall Sin

2012, Vol. 48

Issue (2): 220-226 DOI: 10.3724/SP.J.1037.2011.00594

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MICROSTRUCTURE OF Al₂O₃/YAG/ZrO₂ HYPEREUTECTIC ALLOY DIRECTIONALLY SOLIDIFIED BY LASER FLOATING ZONE METHOD

SONG Kan, ZHANG Jun, JIA Xiaojiao, SU Haijun, LIU Lin, FU Hengzhi

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072

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SONG Kan ZHANG Jun JIA Xiaojiao SU Haijun LIU Lin FU Hengzhi. MICROSTRUCTURE OF Al₂O₃/YAG/ZrO₂ HYPEREUTECTIC ALLOY DIRECTIONALLY SOLIDIFIED BY LASER FLOATING ZONE METHOD. Acta Metall Sin, 2012, 48(2): 220-226.

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Abstract Due to the excellent high temperature mechanical properties, Al₂O₃/YAG/ZrO₂ ternary eutectic in situ composite is considered to be a promising candidate for the material, replacement for nickel based superalloy, of new generation aero space engine turbine blade. The directionally solidified Al₂O₃/YAG/ZrO₂ hypereutectic ceramics are prepared with recently developed laser floating zone melting (LFZM) apparatus. Full eutectic lamellar microstructure, free of primary phase, was obtained with hypereutectic composition. The formation of solid/liquid interface morphology was analyzed in detail. The microstructure texture tendency was explained by combination with interface morphology. The experimental result indicates that, just as the prediction of JH model, average spacing of hypereutectic (λav) agrees with the inverse–square–root dependence on solidification rate (V ) according to λ_avV ^0.5=14.7 μm^1.5·s^−0.5. In lower solidification rate, the lamellar spacing of hypereutectic is higher than that of eutectic composition, but the situation reverses in higher rate. The main reason of such phenomenon is that the addition of ZrO₂ effects the thermal and solute transformation in the melt. The influence of transformation condition on lamellar spacing was analyzed synthetically by using classical irregular growth model. The formation mechanism of banded microstructure, often observed in laser zone melted solidification processing, was also discussed.

Key words: Al₂O₃/YAG/ZrO₂ hypereutectic solid/liquid interface microstructure

Received: 20 September 2011

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Supported by National Natural Science Foundation of China (Nos.51002122 and 50772090), Natural Science Foundation of Shaanxi Province (No.2010JQ6005), Aeronautical Science Foundation of China (No.2010ZF53064), NPU Foundation for Fundamental Research (No.NPU–FFR–G9KY1016), New People and New Directions Foundation of School of Materials Science and Engineering in NPU (No.09XE0104–5), Research Fund of the State Key Laboratory of Solidification Processing in NPU (No.76–QP–2011) and Programme of Introducing Talents of Discipline to Universities (No.B08040)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00594 OR https://www.ams.org.cn/EN/Y2012/V48/I2/220

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