Crack propagation resistance of TiAl alloys
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In: MRS Bulletin, Vol. 47.2022, No. 8, 08.2022, p. 824-831.
Research output: Contribution to journal › Review article › peer-review
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TY - JOUR
T1 - Crack propagation resistance of TiAl alloys
AU - Pippan, Reinhard
AU - Hohenwarter, Anton
N1 - Publisher Copyright: © 2022, The Author(s).
PY - 2022/8
Y1 - 2022/8
N2 - 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.
AB - 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.
KW - Fatigue threshold
KW - Overload
KW - R-curve
KW - Titanium aluminide
UR - http://www.scopus.com/inward/record.url?scp=85138532474&partnerID=8YFLogxK
U2 - 10.1557/s43577-022-00387-2
DO - 10.1557/s43577-022-00387-2
M3 - Review article
AN - SCOPUS:85138532474
VL - 47.2022
SP - 824
EP - 831
JO - MRS Bulletin
JF - MRS Bulletin
SN - 0883-7694
IS - 8
ER -
