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High-Temperature Environmental Embrittlement of Thermomechanically Processed TiAl-Based Intermetallic Alloys with Various Kinds of Microstructures

Published online by Cambridge University Press:  26 February 2011

T. Takasugi ,
Y. Hotta ,
S. Shibuya ,
Y. Kaneno ,
H. Inoue  and
T. Tetsui
T. Takasugi
Affiliation:
Department of Metallurgy and Materials Science, Graduate School of Engineering, Osaka Prefecture University, 1–1 Sakai, Osaka 599–8531, Japan
Y. Hotta
Affiliation:
Department of Metallurgy and Materials Science, Graduate School of Engineering, Osaka Prefecture University, 1–1 Sakai, Osaka 599–8531, Japan
S. Shibuya
Affiliation:
Department of Metallurgy and Materials Science, Graduate School of Engineering, Osaka Prefecture University, 1–1 Sakai, Osaka 599–8531, Japan
Y. Kaneno
Affiliation:
Department of Metallurgy and Materials Science, Graduate School of Engineering, Osaka Prefecture University, 1–1 Sakai, Osaka 599–8531, Japan
H. Inoue
Affiliation:
Department of Metallurgy and Materials Science, Graduate School of Engineering, Osaka Prefecture University, 1–1 Sakai, Osaka 599–8531, Japan
T. Tetsui
Affiliation:
Mitsubishi Heavy Ind Co Ltd, Nagasaki Research & Development Center, 5–717–1 Fukahori-Machi, Nagasaki, 851–0392, Japan
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Abstract

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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 842: Symposium S – Integrative and Interdisciplinary Aspects of Intermetallics , 2004 , S5.45
Copyright
Copyright © Materials Research Society 2005

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References

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