Crack propagation resistance of TiAl alloys

Publikationen: Beitrag in FachzeitschriftÜbersichtsartikel(peer-reviewed)

Autoren

Organisationseinheiten

Externe Organisationseinheiten

  • Erich-Schmid-Institut für Materialwissenschaft der Österreichischen Akademie der Wissenschaften

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 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.

Details

OriginalspracheEnglisch
Seiten (von - bis)824-831
Seitenumfang8
FachzeitschriftMRS Bulletin
Jahrgang47.2022
Ausgabenummer8
DOIs
StatusVeröffentlicht - Aug. 2022