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Interactions of Dislocations and Deformation Twins with Interfacial Boundaries in Titanium Aluminides

Published online by Cambridge University Press:  21 February 2011

Fritz Appel  and
Richard Wagner
Fritz Appel
Affiliation:
Institute for Materials Research, GKSS Research Centre, Max-Planck-Str., D-21502 Geesthacht, Germany
Richard Wagner
Affiliation:
Institute for Materials Research, GKSS Research Centre, Max-Planck-Str., D-21502 Geesthacht, Germany
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Abstract

The deformation behaviour of two-phase titanium aluminide alloys with a lamellar microstructure of the intermetallic phases α2(Ti3Al) and y(TiAl) was studied. The interaction processes of dislocations and deformation twins, respectively, with the lamellar interfaces are investigated by conventional and high-resolution electron microscopy. The mechanisms of translation of shear deformation across, the lamellar boundaries depend on their structure. Semicoherent interfaces are very effective barriers limiting the propagation of shear deformation. The misfit dislocations present at these interfaces support, on the other hand, the generation of dislocations and deformation twins. The observed processes are discussed regarding plastic deformation and crack propagation in the material.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 319: Symposia CB – Defect-Interface Interactions , 1993 , 279
Copyright
Copyright © Materials Research Society 1994

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