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Mechanical Anisotropy of a Gamma Titanium Aluminide Alloy After Hot Extrusion

Published online by Cambridge University Press:  10 February 2011

M. Oehring ,
U. Lorenz ,
R. Niefanger ,
F Appel ,
H.-G. Brokmeier ,
R. Wagner ,
H. Clemens  and
N. Eberhardt
M. Oehring
Affiliation:
Institute for Materials Research, GKSS Research Centre, D-21502 Geesthacht, Germany, [email protected]
U. Lorenz
Affiliation:
Institute for Materials Research, GKSS Research Centre, D-21502 Geesthacht, Germany, [email protected]
R. Niefanger
Affiliation:
Institute for Materials Research, GKSS Research Centre, D-21502 Geesthacht, Germany, [email protected]
F Appel
Affiliation:
Institute for Materials Research, GKSS Research Centre, D-21502 Geesthacht, Germany, [email protected]
H.-G. Brokmeier
Affiliation:
Institute for Materials Research, GKSS Research Centre, D-21502 Geesthacht, Germany, [email protected]
R. Wagner
Affiliation:
Research Centre Jülich, D-52425 Jülich, Germany
H. Clemens
Affiliation:
Institut füir Metallkunde, University of Stuttgart, D-70174 Stuttgart, Germany
N. Eberhardt
Affiliation:
Plansee AG, Technology Center, A-6600 Reutte, Austria
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Abstract

By hot extrusion below and above the α transus temperature equiaxed and predominantly lamellar microstructures were obtained in a Ti aluminide alloy. In order to examine a possible orientation dependence of mechanical properties the flow stress, the activation parameters of plastic deformation and the fracture toughness were determined parallel and perpendicular to the extrusion direction at room temperature and 700 °C. The observed anisotropy in these properties may be mainly attributed to anisotropies in the microstructures, in particular to a preferential alignment of lamellae in lamellar microstructures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK5.13.1
Copyright
Copyright © Materials Research Society 1999

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References

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