Abstract
Abstract In the present work, the cyclic deformation behaviour as well as fatigue crack initiation processes of commercially pure (cp) titanium grade 2 were characterized in axial single step and stepwise load increase tests by mechanical hystereses, corrosion potential and current measurements. Scanning electron microscopic investigations were used to correlate fatigue induced surface damages with the results of electrochemical investigations. Potential measurements proved to be very sensitive to indicate surface damages in situ at the very beginning. The corrosion potential is strongly related to the development of the plastic strain amplitude. Thus, cyclic softening and hardening processes are represented by a characteristic decrease and increase of the potential curve. Current measurements are less sensitive, but allow a detailed characterization of crack propagation processes.
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