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A Study of the Deformation Behavior of Lamellar γ-TiAl by Numeric Modeling

Published online by Cambridge University Press:  26 February 2011

T. Schaden ,
F. D. Fischer ,
H. Clemens ,
F. Appel  and
A. Bartels
T. Schaden
Affiliation:
Institute of Mechanics, Montanuniversität Leoben, Franz-Josef-Straβe 18, 8700 Leoben, Austria
F. D. Fischer
Affiliation:
Institute of Mechanics, Montanuniversität Leoben, Franz-Josef-Straβe 18, 8700 Leoben, Austria Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraβe 12, 8700 Leoben, Austria
H. Clemens
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, FranzJosef-Straβe 18, 8700 Leoben, Austria
F. Appel
Affiliation:
Institute for Materials Research, GKSS Research Center, Geesthacht, Germany
A. Bartels
Affiliation:
Department of Materials Science and Technology, TU Hamburg-Harburg, Eiβendorfer Str. 42, D-21073, Hamburg, Germany
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Abstract

In this paper the deformation behavior of a fully lamellar microstructure, which is usually present in cast γ-TiAl based alloys, is studied by numerical modeling. After large compressive deformation at elevated temperatures the lamellar colonies are often bent or buckled depending on their orientation, which is representative for a deformation instability characterized by a large wave length. Such a deformation behavior is triggered by both, structural defects of the lamellae and their somewhat irregular arrangement. In addition, a shear band-type deformation mode occurs according to an instability mode exhibiting a short wave length. These two deformation modes interact in a rather subtle way, which leads to a very inhomogeneous deformation pattern.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 842: Symposium S – Integrative and Interdisciplinary Aspects of Intermetallics , 2004 , S6.7
Copyright
Copyright © Materials Research Society 2005

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References

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