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In the present investigation, the cyclic deformation behaviour of TiAl6V4 and TiAl6Nb7 was characterized in constant-amplitude and load increase tests in laboratory air and quasi-physiological media by mechanical hysteresis and temperature measurements. Microstructural changes were evaluated by scanning and transmission electron microscopy for defined fatigue states and after specimen failure. The cyclic stress –strain curves of the alloys exhibit a cyclic softening and/or hardening behaviour depending on the stress amplitude. In constant-amplitude tests, the alloys show pronounced softening and/or hardening phases. In load increase tests with strain and temperature measurements, estimated values for the endurance limit were determined which correspond well with the results of Woehler tests. In the load increase tests, an influence of the media on the cycle-dependent damage state could not be detected.

Cyclic deformation behaviour of (α + β) titanium alloys under complex mechanical and physiological loading conditions