Crack propagation resistance of TiAl alloys

Reinhard Pippan, Anton Hohenwarter

Publikation: Beitrag in FachzeitschriftÜbersichtsartikelBegutachtung

1 Zitat (Scopus)


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 to the fracture resistance: plastic deformation, crack bridging, the work to deform and fracture shear ledges, and crack bifurcation. These additional terms in the fracture resistance induce a pronounced R-curve effect or in other words, a crack extension-dependent fracture resistance for monotonic and cyclic loading. In order to deliver guidelines to optimize the microstructural design and to enhance the fracture resistance of TiAl alloys, model systems, including a polysynthetically twinned TiAl, a designed fully lamellar and a near-gamma TiAl alloy are discussed in terms of their fracture mechanism using the energy and stress intensity approach.
Seiten (von - bis)824-831
FachzeitschriftMRS Bulletin
PublikationsstatusVeröffentlicht - Aug. 2022

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