@article{oai:ynu.repo.nii.ac.jp:00003983,
 author = {Nagai, Kotobu and Yuri, Tetsumi and Ogata, Toshio and Umezawa, Osamu and Ishikawa, Keisuke and Nishimura, Takashi and Mizoguchi, Takao and Ito, Yoshimasa},
 issue = {8},
 journal = {ISIJ international},
 month = {},
 note = {application/pdf, Tensile, fracture toughness, and high cycle fatigue tests were done at 293, 77, and 4 K for Ti-6A1-4V alloys with three levels of oxygen content. The alloys were investigated both in as-forged condition and in the rolled condition. Rolling did not necessarily make a grains finer, but changed the shape from plate-like to globular. Strengths depended mainly on the oxygen content; the lower content produced lower strengths. The alloy with lowest oxygen content showed the best ductility at 4 K. The fracture toughness at cryogenic temperature was also enhanced by the reduction of oxygen. In the lowest oxygen alloy, no drop in the fracture toughness was observed between 293 and 4 K. Fatigue properties were influenced by the forming process. The rolled materials had higher fatigue strength than the forged materials. The difference was accentuated at 4 K. This is believed to be due to the difference in the morphology of a grains. The lowest oxygen alloy showed the highest fatigue strength at 4 K.},
 pages = {882--889},
 title = {Cryogenic mechanical properties of Ti-6Al-4V alloys with three levels of oxygen content},
 volume = {31},
 year = {1991}
}