The effect of heat treatment and grain size on magnetomechanical damping properties of Fe-13Cr-2Al-1Si alloy

This paper studied the damping performance of Fe-13Cr-2A1-1Si alloy with different heat treatments using dynamic mechanical thermal analyzer (DMA). The effect of heat treatment and grain size on the damping performance was investigated in detail. It was found that the annealing temperature and grain size have a significant impact on the damping strain amplitude of the alloy. Additionally, we found that heat treatment and grain size can improve the magnetic and mechanical damping performance of this ferromagnetic alloy. Proper annealing temperature and grain size is important to get high damping performance of the alloy. With low strain amplitude, the damping performance of Fe-13Cr-2Al-1Si alloy does not increase monotonously with the increase of the annealing temperature and grain size. The maximum value appears at the annealing temperature of 1100 °C/1 h with the grain size of about 300 μm. At this annealing temperature, the damping performance with furnace cooling is higher than that with air cooling treatment. The extension or shortening of the holding time to a certain extent will reduce the damping performance of the alloy. Besides, this alloy shows low damping performance after air cooling and cold working.