Phase transformation and deformation behavior of NiTi-Nb eutectic joined NiTi wires

Wang, Liqiang; Zhang, Lai-Chang; Chen, Liang Yu; Lü, Weijie; Zhang, Di

doi:10.1038/srep23905

Cited by 41 publications

(16 citation statements)

References 52 publications

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“…In general, it can be seen that the eutectic phases are relatively uniform in the eutectic region. The shape is mainly granular and lamellar, which is consistent with the results reported in [23,26,27].…”

Section: Methodssupporting

confidence: 91%

Effects of Nb on the Microstructure and Compressive Properties of an As-Cast Ni44Ti44Nb12 Eutectic Alloy

et al. 2019

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The addition of Nb can form a eutectic phase with a NiTi matrix in a NiTi-based shape memory alloy, improving the transition hysteresis of the NiTi alloy. A Ni44Ti44Nb12 ingot was prepared using the vacuum induction melting technique. Under compression deformation, the yield strength of the NiTi–Nb alloy is about 1000 MPa, the maximum compressive strength and strain can reach 3155 MPa and 43%, respectively. Ni44Ti44Nb12 exhibited a superelastic recovery similar to that of the as-cast NiTi50. Meanwhile, the loading–unloading cycle compression shows that the superelastic recovery strain reached a maximum value (2.32%) when the total strain was about 15%, and the superelasticity tends to rise first and then decrease as the strain increases.

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Section: Methodssupporting

confidence: 91%

Effects of Nb on the Microstructure and Compressive Properties of an As-Cast Ni44Ti44Nb12 Eutectic Alloy

et al. 2019

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“…This phenomenon can be suspected that the R phase variants forms transition zones which can maintain the compatibility between the phases BCO9 and BCO10. Similar features are also discovered in experimental observations by Wang et al [19].…”

Section: Microstructural Evolution Of the Superelasticitysupporting

confidence: 89%

Microstructural Evolution of Superelasticity in Shape Memory Alloys

Lai

Tsou

2019

Multiscale Sci. Eng.

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Superelasticity in shape memory alloys (SMAs) is an important feature which caused by martensitic transformation and microstructural evolution. The composition of crystal variants and microstructures during the superelasticity process are simulated by molecular dynamics in the current work. Then, a computational post-processing scheme, which can identify variants type and interface orientation are proposed. This method reveals that the crystal adopts a multi-phase mixture during the superelsticity process, including many crystal systems, such as orthorhombic (O), R-phase (R), monoclinic (M) and body-centered-orthorhombic (BCO). In addition, the interface normal vectors between two different variants are examined by the compatibility equation, and the result has good agreement. The stress-strain curve, volume fraction for present variants and total energy diagram are illustrated. The microstructural evolution shows that R phase can serve as the transitional region between pairs of BCO variants. The variants O, BCO, M phase coherent between each other with specific pattern to form twinned arrangement. Furthermore, different random seeds for the initial velocity of the atoms, are used in the simulation to obtain equivalent microstructural evolution paths. The corresponding macroscopic properties are analyzed. The microstructural evolution path can have different energy barrier of initialization, which also leads to different present variant in the crystal. The results discovered in the current work are expected to provides design guidelines for the applications in SMAs.

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“…Titanium shows a vast number of remarkable properties, for instance, high fatigue and corrosion resistance in biological fluids [ 25 ]. Furthermore, among various Ti alloys, the β-type alloys reveal lower elastic moduli [ 26 , 27 ], excellent corrosion resistance [ 28 , 29 ], and improved biocompatibility [ 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 ]. However, the bio-inertness of Ti alloys leads to an extended osseointegration time with bone.…”

Section: Introductionmentioning

confidence: 99%

Multi-Scale Surface Treatments of Titanium Implants for Rapid Osseointegration: A Review

et al. 2020

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The propose of this review was to summarize the advances in multi-scale surface technology of titanium implants to accelerate the osseointegration process. The several multi-scaled methods used for improving wettability, roughness, and bioactivity of implant surfaces are reviewed. In addition, macro-scale methods (e.g., 3D printing (3DP) and laser surface texturing (LST)), micro-scale (e.g., grit-blasting, acid-etching, and Sand-blasted, Large-grit, and Acid-etching (SLA)) and nano-scale methods (e.g., plasma-spraying and anodization) are also discussed, and these surfaces are known to have favorable properties in clinical applications. Functionalized coatings with organic and non-organic loadings suggest good prospects for the future of modern biotechnology. Nevertheless, because of high cost and low clinical validation, these partial coatings have not been commercially available so far. A large number of in vitro and in vivo investigations are necessary in order to obtain in-depth exploration about the efficiency of functional implant surfaces. The prospective titanium implants should possess the optimum chemistry, bionic characteristics, and standardized modern topographies to achieve rapid osseointegration.

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Phase transformation and deformation behavior of NiTi-Nb eutectic joined NiTi wires

Cited by 41 publications

References 52 publications

Effects of Nb on the Microstructure and Compressive Properties of an As-Cast Ni44Ti44Nb12 Eutectic Alloy

Effects of Nb on the Microstructure and Compressive Properties of an As-Cast Ni44Ti44Nb12 Eutectic Alloy

Microstructural Evolution of Superelasticity in Shape Memory Alloys

Multi-Scale Surface Treatments of Titanium Implants for Rapid Osseointegration: A Review

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