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High-Temperature Deformation of Uniaxially Aligned Lamellar TiAl/Ti3Al

Published online by Cambridge University Press:  10 February 2011

H. Heinrich ,
V. Abbächerdi ,
D. J.  and
G. Kostorz
H. Heinrich
Affiliation:
ETH Zürich, Institute of Applied Physics, CH-8093 Zürich, Switzerland
V. Abbächerdi
Affiliation:
now: Université de Genève, Groupe de Physique Appliqudée, CH-1211 Genève, Switzerland
D. J.
Affiliation:
ETH Zürich, Institute of Applied Physics, CH-8093 Zürich, Switzerland
G. Kostorz
Affiliation:
ETH Zürich, Institute of Applied Physics, CH-8093 Zürich, Switzerland
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Abstract

Uniaxially aligned polysynthetically twinned two-phase TiAl/Ti3Al material is produced by induction zone melting and deformed in uniaxial compression. Above 1000 K the strain rate sensitivity is independent of the lamellar orientation and increases strongly with increasing deformation temperature. Results for the strain rate sensitivity parameters are somewhat lower than those obtained for γ-TiAl single- and polycrystals. If the lamellae are oriented parallel or perpendicular to the deformation axis, the flow stress decreases with increasing strain. After plastic deformation the dislocation density in the lamellae is remarkably low indicating recovery processes. At the lamellar interfaces misfit dislocations and periodic arrangements of dislocations with Burgers vectors inclined to the lamellar boundaries are found. In contrast to deformation at lower temperatures, deformation twinning is rare.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK1.4.1
Copyright
Copyright © Materials Research Society 1999

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References

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