Ultrahigh damping capacity achieved by modulating R phase in Ti49.2Ni50.8 shape memory alloy wires
Abstract An ultrahigh damping capacity with internal friction close to 0.35 was detected over a large temperature range of 75 degC (from 40 to 35 degC) in Ti49.2Ni50.8 shape memory wires by adjusting the B2 R phase transformation through a low temperature aging treatment. Microstructural analysis showed that the excellent damping performance is attributed to high density nanodomains in the R phase, which are induced by short range Ni segregation. These results are expected to further expand capacity for designing damping microstructure.