High isothermal internal friction over a large temperature range for dual-phase Ni–Mn–In magnetic shape memory alloy

The isothermal internal friction (IF) behavior of dual-phase Ni52Mn32In16 magnetic shape memory alloy was investigated by dynamic mechanical analysis. The contribution of the isothermal IF to the overall IF peak is close to 90%. This high isothermal IF is obtained over a large working temperature range of 88 °C, which is broadened by the concurrence of the martensitic transformation and the intermartensitic transformation. An strong hindering effect on structural transformations is identified by microstructural observations.