Accession Number : AD0765318

Title :   Fatigue-Crack Growth of Ti-6Al-2Cb-1Ta-0.8Mo Alloy in Air and Natural Sea Water Environments.

Descriptive Note : Memorandum rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Cares,W. R. ; Crooker,T. W.

Report Date : JUL 1973

Pagination or Media Count : 14

Abstract : 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)

Descriptors :   (*TITANIUM ALLOYS, FATIGUE(MECHANICS)), CRACKS, CRACK PROPAGATION, NOTCH TOUGHNESS, SEA WATER, CATHODIC PROTECTION, STRESS CORROSION, FRACTURE(MECHANICS)

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE