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Mechanical Anisotropy in Sheets of γ-TiAl Alloys

Published online by Cambridge University Press:  15 February 2011

A. Bartels ,
H. Clemens ,
C. Hartig  and
H. Mecking
A. Bartels
Affiliation:
TU Hamburg-Harburg, Physics and Technology of Materials, D-21071 Hamburg, Germany
H. Clemens
Affiliation:
Plansee AG, Technology Center, A-6600 Reutte, Austria
C. Hartig
Affiliation:
TU Hamburg-Harburg, Physics and Technology of Materials, D-21071 Hamburg, Germany
H. Mecking
Affiliation:
TU Hamburg-Harburg, Physics and Technology of Materials, D-21071 Hamburg, Germany
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Abstract

At room temperature sheets of γ-TiAl exhibit a higher yield stress in the rolling direction than in the transverse direction. Around 700°C the opposite behavior is observed. The texture mainly consists of a modified cube component. The tetragonal c-axis (001) is aligned in the sheet plane transversely to the rolling direction. Taken into account this special texture and the single crystal yield surface of γ-TiAl we conclude that around 700°C the CRSS of super-dislocations is higher than the CRSS of ordinary dislocations. At RT the relation changes to the opposite.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 141
Copyright
Copyright © Materials Research Society 1997

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References

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