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Oxidation Behavior and Oxide Layers of Ti–50Al Intermetallics by Preoxidation in High-Pressure Oxygen

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Abstract

The oxidation resistance of Ti–50Al intermetallics is improved bypreoxidation for 1, 4, or 16 hours in high-pressure, pure oxygen(≈3.9 atm) at 900°C. Specimens preoxidized for 1 hr exhibit betteroxidation resistance than others. Prolonged preoxidation time candeteriorate the oxidation resistance and reduce the parabolic-lineartransition time during subsequent cyclic oxidation in 800°C air. Theoxide-mound occurrence is an important factor for evaluating theeffectiveness of the preoxidation treatment in oxygen. The formationmechanism of Z-phase (Ti5Al3O2) in the Al-depleted layer beneath theflat oxide scale and that beneath the oxide mound are also proposed inthis study.

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Authors and Affiliations

  1. Institute of Materials Science and Engineering, National Taiwan University, Taipei, 106, Taiwan

    Mu-Rong Yang & S. K. Wu

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  1. Mu-Rong Yang
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  2. S. K. Wu
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Yang, MR., Wu, S.K. Oxidation Behavior and Oxide Layers of Ti–50Al Intermetallics by Preoxidation in High-Pressure Oxygen. Oxidation of Metals 54, 473–490 (2000). https://doi.org/10.1023/A:1004642602296

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