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Abstract

Two phase lamellar TiAl alloys are favorable materials for high temperature application due to the suitable combination of strength and ductility. The presence of interfaces between the TiAl and Ti₃Al phases, and their spacing, is vital for superior mechanical properties. Our aim is to gain a microscopic understanding of the atomic processes that govern deformation in these alloys. We study the interaction of mechanical twinning and dislocation motion with lamellae interfaces, using large scale molecular dynamics simulations. Various methods such as nanoindentation and tensile/shear tests are employed to observe dislocation interface interaction. The goal is to investigate a potential correlation between lamellae thickness and dislocation mobility. Furthermore, we want to confirm confinement effect as observed in twinned metals or thin films, and to determine a critical thickness for changes in the deformation mechanism.