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Effect of Hydrogen on the Behavior of Y-TiAl Atomized Powders

Published online by Cambridge University Press:  26 February 2011

D. S. Shong ,
Y-W. Kim ,
C. F. Yolton  and
F. H. Froes
D. S. Shong
Affiliation:
Metcut-Materials Research Group, P.O. Box 33511, Wright-Patterson Air Force Base, OH 45433-0511
Y-W. Kim
Affiliation:
Metcut-Materials Research Group, P.O. Box 33511, Wright-Patterson Air Force Base, OH 45433-0511
C. F. Yolton
Affiliation:
Crucible Materials Corporation, Crucible Research Center, P.O. Box 88, Pittsburgh, PA 15230-0088
F. H. Froes
Affiliation:
U.S. Air Force Wright Aeronautical Laboratories, Materials Laboratory, AFWAL/MLLS, Wright-Patterson Air Force Base, OH 45433–6533
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Abstract

The effect of hydrogen on the phase stability of γ-TiAl and α2-Ti3Al phases was studied, with emphasis on the investigation of decomposition of a metastable α2 phase to a stable γ phase in gamma alloy powders. In this work, progressive decomposition of α2 → γ was observed to occur during aging with increasing temperatures or time under vacuum and under H2. The microstructural analysis indicated that hydrogen may facilitate such decomposition to occur at lower temperatures and shorter aging time.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 133: Symposium H – High-Temperature Ordered Intermetallic Alloys III , 1988 , 711
Copyright
Copyright © Materials Research Society 1989

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References

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