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High Temperature Creep of Alpha-2 Ti-34mo1%Al Polycrystals

Published online by Cambridge University Press:  22 February 2011

Hiroshi Oikawa ,
Toshihiko Fukuda  and
Makoto Ohtsuka
Hiroshi Oikawa
Affiliation:
Department of Materials Science, Faculty of Engineering, Tohoku University, Sendai, 980–77, Japan
Toshihiko Fukuda
Affiliation:
Now with Sumitomo Light Metal Ind. Ltd., Nagoya, 455.
Makoto Ohtsuka
Affiliation:
Now with Institute for Advanced Materials Processing, Tohoku University, Sendai, 980–77.
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Abstract

Constant-stress compressive creep tests were carried out on an Al-rich a2 single-phase material, which had equiaxed-grains of 60μim in grain size, at 1050∼1250 K under 100∼500MPa. The type of the primary creep stage and the microstructures developed during creep depend greatly on the creep condition. The minimum creep-rate, however, can be represented by one set of parameters over the whole range of experimental condition. The stress exponent is 5.0±0.2 and the (modulus-compensated) activation energy is 360 ± 10kJ/mol. The Dorn-type plot of the minimum creep rate reveals that the normalized creep strength of fine-grained Ti-34mol%Al is not greatly different from that of disordered solid-solution hardened alloys.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 517
Copyright
Copyright © Materials Research Society 1995

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References

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