LOW-CYCLE FATIGUE AND CREEP-BEHAVIOR OF RECRYSTALLIZED MOLYBDENUM NEAR ROOM-TEMPERATURE

The deformation behavior of pure recrystallized molybdenum under cycli c and static loads was investigated in the temperature range between 3 0 degrees C and 100 degrees C, for stress amplitudes between 100 MPa a nd 250 MPa and for static loads up to 200 MPa. The results show that i n spite of the low test temperatures and stress levels the Mo material exhibits considerable plastic strains which depend sensitively on fre quency/time and small changes in temperature. The activation energy de duced for the static and dynamic deformation is less than 0.98 eV whic h indicates thermally activated processes, to be explained by a disloc ation kink model as described in the literature. The low-temperature f atigue behavior appears strongly influenced by creep-fatigue interacti on phenomena.