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Cyclic oxidation behavior of TiAl composites incorporated with TiB2 dispersoids

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Abstract

TiAl alloys incorporated in (0,3,5,10) wt.% TiB2 dispersoids were manufactured via mechanical alloyingspark plasma sintering (MA-SPS), and their cyclic oxidation characteristics were studied at 800, 900 and 1000°C in air. The cyclic oxidation resistance of the prepared TiAl-TiB2 composites effectively increased with increases in TiB2 content. The oxide scale formed consisted of an outer TiO2 layer, an intermediate Al2O3 layer, and an inner (Al2O3+TiO2) mixed layer. The scale adherence was relatively good, and much thinner oxide scales, when compared to TiB2-free TiAl alloys, were formed on the prepared composites. The incorporated TiB2 dispersoids oxidized to TiO2 and B2O3 which evaporated during oxidation.

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Authors and Affiliations

  1. School of Metallurgical and Materials Engineering, Sungkyunkwan University, 300 Chunchun-dong, Changan-ku, 440-746, Suwon, Korea

    D. B. Lee, M. H. Kim, J. Y. Lee, K. B. Park, J. J. Moon & C. W. Yang

  2. Department of Materials Processing Engineering, Korea Institute of Machinery and Materials, 66 Sangnam-dong, 641-010, Changwon, Korea

    S. E. Kim

  3. R&D Division, Korea Gas Safety Corporation, 332-1 Daeya-dong, 429-712, Shiheung, Korea

    S. C. Choi

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  1. D. B. Lee
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Lee, D.B., Kim, M.H., Kim, S.E. et al. Cyclic oxidation behavior of TiAl composites incorporated with TiB2 dispersoids. Met. Mater. Int. 7, 143–149 (2001). https://doi.org/10.1007/BF03026952

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