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The Influence of the Texture on the Creep behavior of γ-TiAl Sheet Material

Published online by Cambridge University Press:  21 March 2011

Arno Bartels ,
Wolfram Schillinger ,
Anita Chatterjee  and
Helmut Clemens
Arno Bartels
Affiliation:
Dep. Materials Science and Technology, Technical University of Hamburg-Harburg, D-21071 Hamburg, Germany
Wolfram Schillinger
Affiliation:
Dep. Materials Science and Technology, Technical University of Hamburg-Harburg, D-21071 Hamburg, Germany
Anita Chatterjee
Affiliation:
Max-Planck-Institut für Metallforschung, D-70174 Stuttgart, Germany
Helmut Clemens
Affiliation:
GKSS-Research Centre Geesthacht, D-21502 Geesthacht, Germany
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Abstract

In hot rolled Ti-46.5at%Al-4at%(Cr,Nb,Ta,B) sheets a strong modified cube texture is found. The c-axes of the tetragonal unit cells in the grains are aligned with the transverse direction of the sheets. This texture causes an anisotropy of the creep resistance which is improved in transverse direction. Heat treatments with different subsequent cooling rates were performed in order to obtain lamellar microstructures with a different spacing of lamellae. Creep experiments exhibit an increase of the creep resistance which is highest after fast cooling. The texture measurements show no longer an alignment of c-axes after the heat treatment in the α-phase field, but a weak {110}-fiber texture in rolling direction occurs which causes a small improvement of the creep resistance in rolling direction. However, the creep resistance of the lamellar microstructure is more determined by the morphology than by the texture.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 646 , 2000 , N1.5.1
Copyright
Copyright © Materials Research Society 2001

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References

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