Thermomechanically processed TiAl-based intermetallic alloys with various alloy compositions and microstructures were tensile tested in various environmental media including air, water vapor and a mixture gas of 5vol.%H2+Ar as a function of temperature. All the TiAl-based intermetallic alloys showed reduced tensile fracture stress (or elongation) in air, water vapor and a mixture gas of 5vol.%H2+Ar not only at ambient temperature (RT~600K) but also at high temperature mostly from 600K to 1000K (sometimes higher temperature than 1000K). The high-temperature environmental embrittlement of TiAl-based intermetallic alloy depended upon the microstructure. The possible species causing the high-temperature environmental embrittlement are hydrogen atoms decomposed from water vapor (H2O) or hydrogen gas (H2), similar to those causing the low-temperature environmental embrittlement.
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This work was supported in part by the New Energy and Industrial Technology Development Organization (NEDO) through Ministry of Economy, Trade and Industry (METI). One of the authors (T.T.) gratefully acknowledges the financial support by the Light Metals Educational Foundation of Japan.
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Takasugi, T., Hotta, Y., Shibuya, S. et al. High-Temperature Environmental Embrittlement of Thermomechanically Processed TiAl-Based Intermetallic Alloys with Various Kinds of Microstructures. MRS Online Proceedings Library 842, 351–356 (2004). https://doi.org/10.1557/PROC-842-S5.45