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Correlation of Strain Hardening and Creep Behaviour of γ-TiAl

Published online by Cambridge University Press:  01 January 1992

A. Bartels ,
J. Seeger  and
H. Mecking
A. Bartels
Affiliation:
Devision of Physics and Technology of Materials, Technical University of Hamburg-Harburg, D-2100 Hamburg 90, Germany
J. Seeger
Affiliation:
Devision of Physics and Technology of Materials, Technical University of Hamburg-Harburg, D-2100 Hamburg 90, Germany
H. Mecking
Affiliation:
Devision of Physics and Technology of Materials, Technical University of Hamburg-Harburg, D-2100 Hamburg 90, Germany
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Abstract

Compression tests on Ti-48AI-2Cr were performed in the temperature range of 650-1000°C. The stress vs. strain curves show an initial increase with a decreasing rate due to dynamic recovery. In the second stage, correlated with dynamic recrystallization (DRX), the stress passes through a maximum and decreases to a steady state value. The characteristic steady state stress associated with dynamic recovery exhibits a lower activation energy (269 kJ/mol) than the steady state stress during DRX (400 kJ/mol). Constant-load creep experiments show a corresponding behaviour. After primary creep the creep rate passes through a minimum. The final steady state creep conditions are dominated by DRX as well.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 1179
Copyright
Copyright © Materials Research Society 1995

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References

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