抄録
Rotating bending fatigue tests were carried out on specimens with a small blind hole of an age-hardened Al-alloy in air and in oil. Fatigue crack growth rate of an age-hardened Al-alloy 6061-T6 is higher in oil than in air, contrary to the other many metals. Hence, it is suggested that the fatigue crack growth is accelerated in an age-hardened Al-alloy by the lubricating action.
