Crack propagation resistance of TiAl alloys

Abstract In their temperature window of application, TiAl alloys typically fail in a semi-brittle manner. For this material class, the Griffith concept, developed initially for ideal brittle materials, has to be adapted by additional dissipative contributions fracture resistance: plastic deformation, crack bridging, work deform and shear ledges, bifurcation. These terms resistance induce pronounced R-curve effect or other words, extension-dependent monotonic cyclic loading. order deliver guidelines optimize microstructural design enhance alloys, model systems, including polysynthetically twinned TiAl, designed fully lamellar near-gamma alloy are discussed mechanism using energy stress intensity approach. Graphical abstract