Document Type
Journal Article
Publisher
Nature Publishing Group
School
School of Engineering
RAS ID
21211
Abstract
NiTi wires were brazed together via eutectic reaction between NiTi and Nb powder deposited at the wire contact region. Phase transformation and deformation behavior of the NiTi-Nb eutectic microstructure were investigated using transmission electron microscopy (TEM) and cyclic loading-unloading tests. Results show that R phase and B19′ martensite transformation are induced by plastic deformation. R phase transformation, which significantly contributes to superelasticity, preferentially occurs at the interfaces between NiTi and eutectic region. Round-shaped Nb-rich phase with rod-like and lamellar-type eutectics are observed in eutectic regions. These phases appear to affect the deformation behavior of the brazed NiTi-Nb region via five distinct stages in stress-strain curves: (I) R phase reorientation, (II) R phase transformation from parent phase, (III) elastic deformation of reoriented martensite accompanied by the plastic deformation of Nb-rich phase and lamellar NiTi-Nb eutectic, (IV) B19′ martensitic transformation, and (V) plastic deformation of the specimen.
DOI
10.1038/srep23905
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Comments
Wang, L., Wang, C., Zhang, L. C., Chen, L., Lu, W., & Zhang, D. (2016). Phase transformation and deformation behavior of NiTi-Nb eutectic joined NiTi wires. Scientific Reports, 6(1), 1-11.
https://doi.org/10.1038/srep23905