Fatigue-Crack Growth of Ti-6Al-2Cb-1Ta-0.8Mo Alloy in Air and Natural Sea Water Environments.
NAVAL RESEARCH LAB WASHINGTON D C
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Studies of low-cycle fatigue-crack propagation in air and natural sea water environments were conducted on a Ti-6Al-2Cb-1Ta-0.8Mo alloy. The effects of cathodic polarization of the alloy in sea water were evaluated. The alloy was tested as single-edge-notched, side-grooved samples in zero-to-tension loading and the results were analyzed in terms of crack-tip stress-intensity parameters. The alloy showed no evidence of fatigue sensitivity to either natural sea water or to applied cathodic potential. These results are in agreement with other studies on a similar Ti-6Al-2Cb-1Ta-0.8Mo alloy and a Ti-6Al-4V alloy of similar yield strength and fracture toughness, but are in sharp contrast to the high degree of environmental sensitivity previously exhibited by a Ti-7Al-2Cb-1Ta alloy. Author
- Properties of Metals and Alloys