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Microstructural Effects on the Creep and Crack Propagation Behaviours of ³-Ti Aluminide Alloy

Published online by Cambridge University Press:  10 February 2011

V. Lupinc ,
G. Onofrio ,
M. Nazmy  and
M. Staubli
V. Lupinc
Affiliation:
CNR-TeMPE, Milan, Italy
G. Onofrio
Affiliation:
CNR-TeMPE, Milan, Italy
M. Nazmy
Affiliation:
ABB Power Generation Ltd., Baden, Switzerland
M. Staubli
Affiliation:
ABB Power Generation Ltd., Baden, Switzerland
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Abstract

Gamma titanium aluminides class of materials possess several unique physical and mechanical properties. These characteristics can be attractive for specific industrial applications. By applying different heat treatment schedules one can change the microstructural features of this class of materials. In the present investigation, two heat treatment schedules were used to produce two different microstructures, duplex (D) and nearly lamellar (NL) in the cast and HIP'ed Ti-47Al-2W- 0.5Si alloy.

The tensile strength and creep behaviour, in the 700–850°C temperature range, of this alloy have been determined and correlated to the corresponding microstructures. In addition, the fatigue crack propagation behaviour in this alloy has been studied at different temperatures. The results on the creep behaviour showed that the alloy with nearly lamellar microstructure has a strongly improved creep strength as compared with that of the duplex microstructure.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK1.2.1
Copyright
Copyright © Materials Research Society 1999

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References

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