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R-Phase Transformation Evolution in NiTi SMA Wires Studied via the Internal Friction Technique
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R-Phase Transformation Evolution in NiTi SMA Wires Studied via the Internal Friction Technique
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Journal Article
R-Phase Transformation Evolution in NiTi SMA Wires Studied via the Internal Friction Technique
2024
Overview
The specific damping capacity variation of heat-treated NiTi was observed during a pseudoelasticity test. The detailed B2 → R-phase transformation process in cold-drawn NiTi wires undergoing middle-temperature aging was studied via X-ray diffraction, transmission electron microscope, and internal friction technique. Results show that, as aging time increased at 450 °C, the dynamic phase transition splitting from B2 → R to B2 → R1 and B2 → R2 became evident. However, such a splitting process was not observed for the sample after aging at 400 °C. The reason for R-phase generation is attributed to non-uniformly distributed stress fields. The splitting of the internal friction peak, in conjunction with high-resolution transmission electron microscope and mechanic results, suggests a substantial occurrence of short-range segregation of Ni atoms in the B2-NiTi matrix. Furthermore, the specific damping capacity (SDC) exhibits a gradual increase with prolonged annealing time. Specifically, the sample with significant dynamic phase transition splitting reaches an SDC value of 0.60.
Publisher
MDPI AG
Subject
/ Cold
/ Cooling
/ Friction
/ Methods
/ R phase
/ Transmission electron microscopes
/ Transmission electron microscopy
/ variant
/ Wire
/ X-rays
