Abstract: Cu-based shape memory alloy as a kind of important damping material has wide objective demands. Its high damping capacity near room-temperature of alloy is directly associated with the application and has gained special attention. In this paper, Cu-27.5Al-3.5Ni (at%) shape memory alloy was prepared by powder metallurgy. The microstructure of the alloy was controlled by changing the cooling mode. A typical internal friction peak was observed in the water-cooling and air-cooling samples, which moved towards lower temperature region near room temperature with the increase of cooling rate. It is rationalized that the internal friction peak is originated with the reverse martensitic transformation. The absence of internal friction peak in furnace cooling samples is attributed to the eutectoid decomposition of the material at high temperature and thus no martensitic phase formation. Compared with furnace-cooled and air-cooled samples, water-cooled samples can obtain higher damping capacity at room temperature range, which is related to the increase of numbers of martensite strips and interface amount between martensite and austenite.
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2022, Vol. 36 
