Abstract
To study the fatigue micromechanism in vacuum, fatigue tests for the double notched pure titanium thin plate (0.2 mm thick) were carried out in plane bending at various controlled pressure levels ranging from 1.33 × 10 −3 to 10 5 Pa. A continuous time record of specimen temperature was obtained during the fatigue tests. It was found that a sharp increase in both fatigue life and fatigue limit occurred in the pressure range 1–10 Pa. In vacuum of less then 10 Pa, the specimen temperature was raised up to greater than 20 K above room temperature and then the spread of plastic zone was evidently observed around a main crack, when specimens were cyclically stressed at σ = ± 150 MPa. Fatigue deformability was found to be very sensitive to temperature changes slightly above room temperature. This tendency appeared to be more remarkable for higher purity titanium. The improvement of fatigue life in vacuum was discussed in association with the enhancement of plastic deformability due to internal heating as well as the kinetics of molecular adsorption at the tip of a growing crack.
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