R-Phase Transformation Evolution in NiTi SMA Wires Studied via the Internal Friction Technique
收藏中国科学院兰州化学物理研究所科学数据中心2025-12-12 更新2026-01-10 收录
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资源简介：
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.
提供机构：
中国科学院兰州化学物理研究所科学数据中心
创建时间：
2025-12-12
