|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Titanium Technology
||Micromechanical Fracture Behavior of Distinct Interfaces in an Intermetallic TiAl Alloy
||Michael Burtscher, Markus Alfreider, Klemens Schmuck, Helmut Clemens, Christoph Gammer, Daniel Kiener
|On-Site Speaker (Planned)
The applicability of modern TiAl alloys is limited by their low ductility and fracture behavior at ambient temperatures. This is governed by different interface strengths and the effect of alloying elements on the respective interfacial fracture properties. In this study, fracture toughness and J-integral of selected interfaces of a C and Si-doped TNM alloy are determined by notched micro cantilever experiments. Additionally, strains along these interfaces were measured using 4D-STEM microscopy. The crack propagation was analyzed by complementary continuous stiffness measurements and computer vision techniques. This allows to follow the current crack propagation through distinct lamellae or grains as well as along different interfaces during the in-situ fracture experiments. This enabled us to identify the influence of the crack path on the presence of interfacial strains due to misfit dislocations or segregated dopant elements. Furthermore, the effect of ζ-Ti5Si3 silicides on the fracture behavior for α2/γ interfaces was determined.