Regensburg 2016 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MM: Fachverband Metall- und Materialphysik

MM 26: Poster session II

MM 26.9: Poster

Dienstag, 8. März 2016, 18:30–20:30, Poster B3

Plasticity of interfaces - TEM in situ indentation and atom probe microscopy on TiAl — •Carolin Puscholt and Mathias Göken — Friedrich-Alexander-Universität Erlangen-Nürnberg, Department of Materials Science and Engineering, Insitute I, Martensstr. 5, 91058 Erlangen, Deutschland

Interfaces in crystalline metallic materials significantly influence the material’s mechanical properties. In fact, the study of the behavior of crystalline materials can often be reduced to the study of the structure and properties of their internal interfaces.

In this work Titanium Aluminides (Ti-48Al) are studied as a model system to determine the properties of interfaces since they offer a lamellar structure that represents a multilayer system made of two phases with a semi-coherent interface and a very distinct orientation relationship between the tetragonal γ-TiAl phase with its L1₀ structure and the hexagonal α₂-Ti₃Al phase with an ordered D0₁₉ structure. This was done by in situ indentation in the transmission electron microscope where the mechanical response of the material to indentation loads can be studied in real-time which permits the direct observation of the dynamics and mechanisms of dislocation motion and dislocation-interface interactions. Further investigations to study specific interface characteristics like segregations to (misfit) dislocations or deviations from the perfect stoichiometry of intermetallic phases that also strongly influence the properties were done via atom probe microscopy as a complementary method.