LOW-TEMPERATURE MECHANICAL PROPERTIES AND FRACTURE TOUGHNESS OF TI-6AL-6V-2SN.
ARMY MATERIALS RESEARCH AGENCY WATERTOWN MASS
Pagination or Media Count:
The mechanical properties of Ti-6Al-6V-2Sn have been evaluated in the temperature range from 200 to -269C. A commercial and an extra-low interstitial ELI grade of the alloy were studied in both the as-received and heattreated conditions. The ELI grade was heat treated to two different microstructures each havine a yield strength level from 170 to 180 ksi. The data show that fatigue cracks severely reduced the notch strength and resulted in lower K sub Ic values than when sharply machinenotched. The material treated at the higher solution temperature exhibited higher K sub Ic values than that heat treated at the lower solution temperature, despite the higher alpha-beta ratio of the latter condition. Author