Temperature evolution mechanism of AZ31B magnesium alloy during high-cycle fatigue process

The superficial temperature evolution of 10 mm-thick extruded AZ31B magnesium alloy plate was measured during the high-cycle fatigue test. The mechanism of heat generation was analyzed according to the law of energy conversion. The temperature fluctuation during the fatigue test was related to the cyclic hardening/softening process which was discussed according to the followed tensile tests. The temperature evolution was also measured during tensile tests. The influence of cyclic hardening/softening process on the change of thermoelastic effect in tensile tests was also discussed. Finally, the density evolution of dislocation was related to the energy change during fatigue tests.