title: Phase transformation and deformation behavior of NiTi-Nb eutectic joined NiTi wires.
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.
authors.affiliation: State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China.|Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois, 60208, USA.
authors.forename: Liqiang
authors.initials: L
authors.lastname: Wang
authors.affiliation: Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois, 60208, USA.|School of Materials and Metallurgy, Northeastern University, Shenyang, 110819, China.
authors.forename: Cong
authors.initials: C
authors.lastname: Wang
authors.affiliation: School of Engineering, Edith Cowan University, 270 Joondalup Drive, Joondalup, Perth, WA 6027, Australia.
authors.forename: Lai-Chang
authors.initials: LC
authors.lastname: Zhang
authors.affiliation: School of Mathematics and Science, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu 212003, China.
authors.forename: Liangyu
authors.initials: L
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: Weijie
authors.initials: W
authors.lastname: Lu
authors.affiliation: State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China.
authors.forename: Di
authors.initials: D
authors.lastname: Zhang