Abstract
Synergistic effects of a novel Cu51Hf14 inoculant and Zr element on the microstructure, mechanical and damping properties of Cu-Al-Mn shape memory alloy were investigated. The results showed that grains of the alloy could be significantly refined due to the heterogeneous nucleation of Cu51Hf14 and the pinning effect of AlCu2Zr particles on grain boundaries (GBs), the martensite lath was also greatly refined. Mechanical properties were improved obviously, the alloy with the smallest grain size showed the highest tensile strength and elongation. This attributed to grain refinement, increasing difficulty of grain coordination deformation, decreasing mobility of martensite variants and the pinning effect of AlCu2Zr on dislocation. The compound refining alloys possessed high room-temperature damping owing to the increased interface density and the uncoordinated deformation of AlCu2Zr and Cu-Al-Mn matrix. While its high-temperature damping was lower than that of the inoculated alloy because of the decreasing martensite content caused by the increasing GB influence zone and the precipitation of AlCu2Zr.
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