#6963. Fatigue crack growth behavior of a titanium aluminide intermetallic

January 2027publication date
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Journal’s subject area:
Mechanical Engineering;
Mechanics of Materials;
Condensed Matter Physics;
Materials Science (all);
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Abstract:
This paper examines the fatigue crack growth behavior, from threshold stress intensity factor range to final failure, of a Ti-24at.%Al-11at.%Nb alloy with an ?2 + ? duplex microstructure. At a load ration of 0.1 and a frequency of 20 Hz, subcritical crack growth at room temperature occurs at a threshold stress intensity factor range ?Kth ? 6 MPa m 1/2 , which is substantially lower than the quasi-static fracture toughness KIc ? 22 MPa m 1/2 . While an increase in load ratio (to 0.5) leads to only a small reduction in ?Kth, a decrease in the fatigue frequency (to 1 Hz) and an increase in test temperature (to 800°C) cause a significant acceleration in crack growth rates at the intermediate ?K levels. Salient fatigue crack propagation characteristics of the intermetallic are discussed. A testing procedure which involves precracking in cyclic compression is suggested whereby the entire range of fatigue crack growth rates at ambient and elevated temperatures can be determined in both brittle and ductile intermetallics without any artificial load reductions.
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