Damping Behavior of NiMnGa/Resin Composites Under Magnetical Field

Ferromagnetic shape memory alloys such as Ni-Mn-Ga have emerged as an important class of high damping materials in recent years, not only due to their characteristic martenstic-austenitic transformation similar to the shape memory alloys, but also owing to their additional magnetically controlled reorientation of martenstic twin variants. However, the intrinsic brittleness of Ni-Mn-Ga alloys limited their application. Recently, more attentions are put on Ni-Mn-Ga particle/polymer composite materials. The damping capacity of 30% Ni-Mn-Ga /epoxy resin composite is improved by the orientation magnetic field applied along the long direction of sample during sample fabricating. The IF value of magnetic field orientated composite increases, when the magnetic field is applied during damping test along the orientation magnetic field.