| TiNiCu alloy ribbons have been widely used in MicroElectric Mechanical System(MEMS), because of their excellent shape memory effect as well as superelasticity. Rapid solidification by melt spinning can introduce changes in the microstructure and other characteristics in comparison to the bulk material, as the reduction of the grain size. Proper annealing process can flexibly modify the final crystalline structure, and thus some properties of the martensitic transformation for alloy ribbons.In this paper, Ti50Ni24.9Cu25Y0.1ribbons were fabricated by single-roll melt spinning technique. The microstructure of as-spun and annealed ribbons is studied, and the marentsitic transformation of alloy ribbons is explored. Moreover, the damping properties of alloy ribbons are also investigated.The results showed that, the microstructure of Ti50Ni24.9Cu25Y0.1as-spun ribbons has been crystallized. The crystalline particles composed of B19’martensitic phase belong to nanocrystalline. And the particles grow with the rise of annealed temperature. In the condition of heating down or up, Ti50Ni24.9Cu25Y0.1ribbons show martensitic forward or reverse transfomation. The transformation temperature is from40to65℃. The ribbons could be exploited as actuators, because of the transformation hysteresis is very small. The damping properties of Ti50Ni24.9Cu25Y0.1ribbons increase after annealing treatment. |
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