Ti Nb Research Articles

Structural Changes due to Heating and Stress Loading of Metastable Quenched Martensite Structures in Ti–(10–20) mass% Nb Alloys

The metastable-phase characteristics of Ti–Nb alloys can be exploited to improve their functional properties such as damping. In this study, we investigated the structural changes in the metastable quenched martensite structure of Ti–Nb alloys subjected to heating and tensile strain. We examined the differential scanning calorimetry (DSC) heating curves in the reduction state, X-ray diffraction (XRD) profiles under loading/unloading, and material properties such as Young’s modulus and internal friction upon heating. In the DSC heating curve of the 10%-cold-rolled Ti15Nb specimen, an exothermic peak was observed, and for Ti18Nb and Ti20Nb, the exothermic peak exhibited broadening. We speculate that the underlying reason is the biphasic formation resulting from specimen deformation. From the XRD measurements, we found that the lattice tended to shrink upon stress application and recover upon unloading. Significant changes in Young’s modulus and internal friction were observed in the α′′ structures of Ti18Nb and Ti20Nb during initial heating up to 373 K. We posit that the material properties changed owing to structural changes, such as lattice-constant changes, biphasic formation, and crystal orientation changes, resulting from heating or plastic deformation.

Assessment of β stabilizers additions on microstructure and properties of as-cast β Ti–Nb based alloys

The novelty of the present work lies in elucidating the correlation of Moeq with mechanical and surface parameters. The Ti–15Nb (TN-15), Ti–40Nb (TN-40), Ti–33Nb–33Zr (TNZ-33), Ti–40Nb–40Zr (TNZ40) and Ti–35Nb–7Zr–5Ta (TNZT) alloys were obtained by casting. The alloys were formed by β-Ti grains with a micrometric morphology, except the as-cast TN-15 alloy formed by α + β. Adding Nb and Zr influenced the lattice parameters of phase β, as well as the crystal structure. Grain size (GS) decreased adding Nb and Zr following this relation: TN-40 > TNZ-33>TNZT > TNZ40. The roughness decreased with rising Nb and Zr contents being in the range of 1.3–3 μm, and it was possible to correlate it with the Moeq. The contact angle and free energy surface values were inversely proportional, and the as-cast TNZ40 alloy with smaller GS was less wettable (60) than TN40 (GS: 1423 μm). The mechanical properties decreased to Moeq of 14.9 wt% then their significantly went above this value, except for the as-cast TN-15 alloy (E: 65 GPa, microhardness: 264 HV) formed mainly by a hardener phase α. Both elastic modulus and microhardness showed the same tendency as the Moeq values and the cell parameter of phase β (aβ). The oxygen content was all in accordance with ASTM E1409-13 for applications as metallic biomaterials being in the range of 0.044–0.195 wt%.

Electrochromic Performance of Sputtered NbTi-Based Mixed Metal Oxide Thin Films with a Metallic Seed Layer.

An attempt has been made to promote the efficiency of the electrochromic (EC) windows to perform at a faster switching rate with good coloration and easy recyclability. In this work, ion-assisted pulsed DC unbalanced confocal magnetron sputtering is used to fabricate mixed metal oxide thin films of Nb and Ti (which are termed as NTO) for EC applications. Further, to increase the EC efficiency of this film, a very thin metallic seed layer is incorporated between the substrate and the film using the layer-by-layer (LBL) coating strategy. The film was prepared by two steps: (i) very thin metallic seed layer coating and (ii) mixed metal oxide NTO layer coating. The metal layer was made of a Nb metal, Ti metal, and NbTi mixed metal, which was coated with the substrate and NTO layer, resulting in three different films, namely, Nb-NTO, Ti-NTO, and NbTi-NTO. The EC properties of these three films were studied in 1 M LiClO4 dissolved in propylene carbonate and compared with the as-prepared NTO film. The results showed that the Nb-NTO film showed better EC properties, fast switching, better stability, and good recyclability. To check the stability, the film was subjected to prolonged cycling of 500 cycles with a harsh anodic and cathodic sweep at the scan rate of 100 mV s-1. The UV-Vis spectrum confirmed the Li+ trapping in the films after prolonged cycling. To detrap the ions from the host surface, galvanostatic detrapping is carried out called rejuvenation studies. The rejuvenation rate of films is studied at a constant current loading of ∼2 × 10-5 A cm-2. To check the commercialization of the EC window, we successfully fabricated the Nb-NTO device with a PEO-LiClO4-based polymer gel electrolyte.

Reduced Ti–Nb–O Nanotube Photoanode with Bulk-Phase Nb Doping and Surface Oxygen Vacancy Engineering for Enhanced Photoelectrochemical Water Splitting

Improving optical absorption and photogenerated electron–hole separation–transport performances of TiO2-based nanostructures are considered as key strategies for realizing high-efficiency photoelectrochemical (PEC) water splitting. In this work, we successfully prepared VO/Ti–Nb–O nanotubes through bulk-phase Nb doping with surface electrochemical reduction-introduced oxygen vacancies for an enhanced PEC performance. Microstructure analysis combined with density functional theory calculation revealed that synergistic Nb doping with oxygen vacancy self-doping could drive the Fermi level shift toward the conduction band and introduce shallow donor energy levels below the conduction band. This could not only improve electrical conductivity of the reduced Ti-based system but also enhance the transport efficiency of photogenerated carriers. Compared with that of pristine TiO2 (0.38 mA/cm2), the photocurrent density of the VO/Ti–Nb–O increased to 1.72 mA/cm2. The solar-to-hydrogen efficiency was 0.67%, which was 2.8 times higher than that of intrinsic TiO2. This work introduced oxygen vacancies into Ti–Nb–O nanotubes by one-step facile electrochemical reduction, which may provide a potential synergistic strategy for developing new-type and high-efficiency Ti-based nanostructure photoanodes for boosted PEC water splitting.

Biomechanical Behavior of Narrow Dental Implants Made with Aluminum- and Vanadium-Free Alloys: A Finite Element Analysis.

Titanium (Ti) alloys used for narrow dental implants usually contain aluminum (Al) and vanadium (V) for improved resistance. However, those elements are linked to possible cytotoxic effects. Thus, this study evaluated the biomechanical behavior of narrow dental implants made with Al- and V-free Ti alloys by the finite element method. A virtual model of a partially edentulous maxilla received single implants (diameter: 2.7 and 2.9 mm; length: 10 mm) at the upper lateral incisor area, with respective abutments and porcelain-fused-to-metal crowns. Simulations were performed for each implant diameter and the following eight alloys (and elastic moduli): (1) Ti-6Al-4V (control; 110 GPa), (2) Ti-35Nb-5Sn-6Mo-3Zr (85 GPa), (3) Ti-13Nb-13Zr (77 GPa), (4) Ti-15Zr (113 GPa), (5) Ti-8Fe-5Ta (120 GPa), (6) Ti-26.88Fe-4Ta (175 GPa), (7) TNTZ-2Fe-0.4O (107 GPa), and (8) TNTZ-2Fe-0.7O (109 GPa). The implants received a labially directed total static load of 100 N at a 45° angle relative to their long axis. Parameters for analysis included the maximum and minimum principal stresses for bone, and von Mises equivalent stress for implants and abutments. Ti-26.88Fe-4Ta reaches the lowest maximum (57 MPa) and minimum (125 MPa) principal stress values, whereas Ti-35Nb-5Sn-6Mo-3Zr (183 MPa) and Ti-13Nb-13Zr (191 MPa) models result in the highest principal stresses (the 2.7 mm model surpasses the threshold for bone overload). Implant diameters affect von Mises stresses more than the constituent alloys. It can be concluded that the narrow implants made of the Ti-26.88Fe-4Ta alloy have the most favorable biomechanical behavior, mostly by mitigating stress on peri-implant bone.

Development of a porous Ti–35Nb–5In alloy with low elastic modulus for biomedical implants

A new porous Ti–35Nb–5In alloy was designed to join the advantages of low elastic modulus and non-toxicity, which are critical factors for biomedical implants. The Ti–35Nb–5In alloy was produced by powder metallurgy, and its feasibility as implant material was evaluated through mechanical properties, ion release, and electrochemical assessments. The microstructure of the Ti–35Nb–5In alloy consisted of acicular α-phase and fine α’’-phase within a micrometric β-phase matrix. A low elastic modulus of 63 GPa, as well as hardness and flexural strengths higher than the reported for the human bone, ensured the mechanical adequacy of the alloy. The Ti, Nb, and In releases were below toxic levels for the human body. The electrochemical performance showed the formation of a surface passive layer formation that encouraged a low corrosion rate. The corrosion performance was mainly influenced by chemical heterogeneities (preferred dissolution of Nb segregates) and porosity. Based on the above, the porous Ti–35Nb–5In alloy was demonstrated as a promising candidate for biomedical implant applications.

Additive manufacturing of the high-strength and low modulus biomedical Ti-10 Nb alloy under reactive atmosphere

In situ enhancement of alloy properties via additive manufacturing is a convenient and promising approach that is attracting increasing attention. Herein, we overcame the insufficient strength of Ti-10Nb alloy used in orthopedic implants by introducing an Ar + N 2 reactive atmosphere during selective laser melting. The mechanical properties, phase compositions, microstructures, and biocompatibility of the Ti-10Nb alloys formed under the reactive atmospheres containing 3 vol.% and 5 vol.% N 2 were investigated. Scanning electron microscope, electron backscatter diffraction, and transmission electron microscope were employed to investigate the mechanism of N on the mechanical property evolution of Ti-10Nb. The biocompatibility of the Ti-10Nb alloys fabricated under different N 2 concentrations was investigated using in vitro cell proliferation and adhesion assays, with pure Ti used as a reference. The Ti-10Nb alloy displayed a tensile strength of 855 MPa, yield strength of 763 MPa, an elongation of 21.6%, and elastic modulus of 72 GPa when the N 2 fraction was 3 vol.%. The as-printed Ti-10Nb alloy exhibited good biocompatibility, and the introduction of N promoted the proliferation of MG-63 cells. This study paves the way for the synthesis of high-strength and low modulus biomedical Ti alloys by reactive additive manufacturing.

Damping Capacity of Ti–Nb Shape Memory Alloys Evaluated Through DMA and Single-Impact Tests

Damping Capacity of Ti–Nb Shape Memory Alloys Evaluated Through DMA and Single-Impact Tests

The Calculated and Experimental Elastic Properties of Quenched Biocompatible Ti–Nb, Ti–Nb–Zr, Ti–Nb–Zr–Sn, and Ti–Nb–Zr–Sn–Ta Titanium Alloys

The Calculated and Experimental Elastic Properties of Quenched Biocompatible Ti–Nb, Ti–Nb–Zr, Ti–Nb–Zr–Sn, and Ti–Nb–Zr–Sn–Ta Titanium Alloys

Zircon U Pb geochronology and petrology of the tholeiitic gabbro from the Kovanlık (Giresun) area: Constraints for the Late Cretaceous bimodal arc magmatism in the Eastern Pontides Orogenic Belt, NE Turkey

Mafic intrusions of the Eastern Pontides Orogenic Belt (EPOB) in NE Turkey are found rarely in varying ages, sizes and compositions. Of these, tholeiitic gabbro stocks, namely Kovanlık gabbro, consist of pyroxene gabbro and minor hornblende gabbro with a mainly granular texture. The pyroxene gabbro contains plagioclase, clino- and ortho-pyroxene, olivine, and Fe Ti oxides, whereas the hornblende gabbro includes mainly plagioclase, hornblende, rarely biotite and Fe Ti oxides. The clinopyroxene compositions of the pyroxene gabbro exhibit arc-related tholeiitic magmas. The Kovanlık gabbroic rocks have high U/Yb zircon ratios, implying continental arc-related tectonic settings. Zircon U Pb dating on the Kovanlık gabbro yielded a concordia age of ~92 Ma (Turonian). Petrochemically, the gabbroic rocks have a tholeiitic character and show arc- and MORB-like signatures. The gabbroic rocks show positive Rb, Ba, K, Pb, Sr, Ti and negative Nb, Ce, Nd, Hf, Zr anomalies in N-MORB normalized diagrams. The chondrite-normalized REE plots of the rocks show flat to feeble right-dipping REE patterns (La N /Lu N = 0.94–2.56) with positive Eu anomalies (Eu N /Eu* = 1.15–2.14; except for two pyroxene gabbro samples). The gabbroic rocks have 87 Sr/ 86 Sr (i) ratios (0.704533 to 0.706265), εNd (i) values (4.04–4.85), 206 Pb/ 204 Pb (18.56–18.68) and 207 Pb/ 204 Pb (15.61–15.64) ratios. Low Nb/La and Nb/Y ratios, as well as high Sr/Yb and Ba/Rb ratios, indicate that source regions were modified by slab-derived fluids and/or melts. The obtained zircon dating, isotopic and geochemical data, as well as regional geology, revealed that the tholeiitic mafic magma derived from a spinel-lherzolite mantle at a relatively shallow depth, and the Kovanlık gabbro in the EPOB represents one of the first mafic intrusions of Late Cretaceous bimodal arc magmatism related to the roll-back of the northwards subducting Tethys oceanic plate. • The Kovanlık tholeiitic gabbro formed in a continental arc with a MORB-like source. • The zircon U Pb dating of the gabbro gave a concordia age of ~92 Ma (Turonian). • The parent magma originated by partial melting of a spinel lherzolite mantle source. • The gabbro evolved by fractional crystallization and lesser crustal assimilation. • Cretaceous bimodal arc magmatism is related to the rollback of the subducting slab.

Surface film characterizations and electrochemical behavior of type I collagen-immobilized interconnected porous Ti–Nb–Zr–Sn alloy scaffolds in simulated inflammatory environment

Inflammation in the tissue surrounding titanium (Ti)-based alloy implants can lead to increased acidity and the release of reactive oxygen species (e.g., H2O2), which can undermine the corrosion resistance of surface protective films. This study created 3D-printed interconnected porous Ti–24Nb–4Zr–8Sn (Ti2448) alloy scaffolds, over which was applied alkali treatment followed by type I collagen immobilization via natural cross-linker procyanidin. The samples were characterized in terms of polarization curves, surface film characterizations, and electrochemical impedance spectroscopy analysis under simulated inflammatory (SI) environment (150 mM H2O2-containing simulated body fluid with pH 5.2). The SI environment was shown to compromise the corrosion resistance of untreated Ti2448 scaffolds. The surface-treated samples presented a dense, homogeneous surface film of mainly TiO2 and Nb2O5, which moderated the adverse effects of SI environment. Electrochemical equivalent circuits of the surface-treated Ti2448 scaffolds under SI environment included two resistor-capacitor (RC) circuits, corresponding to a protective inner film and a less protective outer film. This might be the first study which proposed a unique surface treatment to provide a protective surface film over 3D-printed interconnected porous biomedical Ti2448 alloy scaffolds under SI environment.

Oligocene calc-alkaline lamprophyres and K-rich association in the eastern Iranian ranges: Products of low-degree melting of subduction-modified lithospheric mantle in post-orogenic setting

Late- to post-orogenic lamprophyric and K-rich associations in the eastern Iranian ranges may be able to reveal some obscure issues about the petrogenesis and the role of tectonics in the formation of this rare group of igneous rocks. In this paper, we investigate new zircon U–Pb ages and elemental and Sr–Nd isotope characteristics of coexisting various rock suites as the post-tectonic products of the Paleogene orogeny . Lamprophyres are found in three occurrence modes in the eastern Iranian ranges. The first group is composed of olivine minette/shonkinite bodies in the Lar Complex, which is expressed as a post-tectonic volcano with Calderon subsidence that occurs currently as a ring-dike association and related explosion breccia . The second group consists of lamprophyric lavas of mainly mafic phonolite composition in Hormak. The last group is appinite/porphyrite occurring as stock/sub-volcanic bodies in Malek Siah Kuh. These three magmatic suites including lamprophyre and associated magmatic rocks are genetically, spatially and temporally related to one common K-rich mantle-derived magma . Zircon U–Pb dating of representative monzonite/syenite samples of the Lar Complex yielded ages of 31.43 ± 0.3 and 31.60 ± 0.40 Ma, respectively. Whole-rock geochemical and Sr–Nd isotope investigations demonstrated similar rare earth element (REE) patterns, with distinct enrichment in large lithophile elements (LILEs) and depletion in Ta–Nb–Ti, and limited variations in εNd (t) (+0.50 − +4.80) and 87 Sr/ 86 Sr (0.7043–0.7066) values. These characteristics, together with modeling of batch melting suggest that they were comagmatic and derived from a metasomatized lithospheric mantle source modified by a precursory subduction episode, through a low degree of partial melting (2–5%) at high-pressure conditions at depths >70 km with garnet in the residue. The Harirud fault activity possibly controlled the path, station and rapidity of magma ascent to the crustal levels, and, consequently, the water pressure of crystallization of the K-rich magmas and diversity of magmatic products. • The lithospheric mantle in the eastern Iranian ranges is highly heterogeneous. • Lamprophyres and K-rich association were products of post-orogenic magmatism. • The Harirud fault has crucial role in generation, transport and evolution of K-rich magmas.

Investigation of the surfaced metal of the Fe–Cr–Ni–Mn–Mo–Ti–Nb–C system for operation under high-temperature gas-abrasive wear

Compositions of flux-cored wires for electric arc surfacing of alloys of the Fe-Cr-Ni-Mn-Mo-Ti-Nb-C alloy system, resistant to high-temperature gas-abrasive wear, were developed. The deposited alloys were studied by optical and electron microscopy, X-ray mi-crospectral and X-ray diffraction analysis. The influence of the carbon content in the alloy on its structural-phase composition, hardness, and wear resistance at normal and elevated temperatures up to 600°C was revealed. It was established that increasing the carbon content in the alloy from 1.2 to 2.8 wt. % leads to increasing the volume fraction of (Cr, Fe)xCy carbides involved in the formation of the eutectic austenite-carbide matrix of the alloy at 6 times. Their morphology also changes from (Fe, Cr)23C6 to (Fe, Cr)7C3. In this case, the content of (Ti, Nb, Mo)xCy and MoxC carbides in the alloy changes insignificantly, and their average size increases by 10%. It has been established that the formation of a composite structure in the alloy contributes to its high resistance to gas-abrasive wear at a temperature of 600°C. The wear resistance of the developed alloy is comparable to a foreign industrial analogue at a much lower cost.

High-throughput determination of mechanical and diffusion properties in the Ti–Nb–Fe alloys

Accurate Young's modulus, hardness, and interdiffusion coefficient are the necessary information for the design and production of biomedical multicomponent alloys. In this work, five sets of ternary Ti–Nb–Fe diffusion couples were prepared after annealing at 1273 K for 25 h. The composition-dependent Young's moduli and hardness in the bcc Ti–Nb–Fe system were experimentally determined by means of nanoindentation and electron probe microanalysis (EPMA) techniques. Moreover, the main and cross interdiffusion coefficients of Ti–Nb–Fe alloys at 1273 K were confirmed from the composition gradients of the diffusion couples by using a pragmatic numerical inverse method. A composition-dependent database on the mechanical and diffusion properties of Ti–Nb–Fe alloys was carefully established and utilized for the discussion of the processability during the hot workability. The results indicated that Fe concentration control could be very helpful for the development of Ti–Nb–Fe alloys with low Young's modulus, high hardness, and nice processability during the hot working.

Genesis of the recently discovered Daxiyingzi Rb–Be deposit on the northern margin of the North China Craton: Evidence from 40Ar/39Ar ages and geochemical data

A new Rb–Be rare metal deposit has been discovered in the northern margin of the North China Craton in Fuxin City, western Liaoning Province, China. The Daxiyingzi Rb–Be deposit is a granitic pegmatite-type deposit and composed mainly of biotite granite, albite granite, and amazonite granitic pegmatite. Amazonite and beryl are the main ore minerals containing Rb and Be, and occur in the amazonite granitic pegmatite. We present integrated biotite 40Ar/39Ar geochronology, mineralogy, whole-rock geochemistry, and Nd–Pb isotope analyses of the Daxiyingzi ore-bearing granites to better understand their petrogenesis and geodynamic setting. Biotite separates in biotite granite and albite granite yield 40Ar/39Ar ages of 223.27 ± 2.39 and 223.37 ± 2.45 Ma, which we interpret as the metallogenic age of the deposit. The Daxiyingzi granites have high A/CNK ratios (1.01–1.11) and sufficient contents of SiO2 (74.68–79.42 wt%), total alkali (K2O + Na2O, 7.89–9.49 wt%), Li (64.0–300 ppm), Be (6.85–10.95 ppm), Nb (38.2–144 ppm), Ta (12.6–109 ppm), and Rb (60.8–1426 ppm). Depletion in Eu, Ba, Sr, P, and Ti and enrichment in Rb, Th, Nb, Ta, Nd, and Hf indicate that the granites are highly fractionated I-type granites. The Nd–Pb isotopic compositions [εNd(t) = −2.5 to −4.1; TDM2 = 1320–1202 Ma] of these granites suggest that they were derived from a single magma reservoir in an extensional orogenic setting at ∼223 Ma via high-temperature partial melting of Mesoproterozoic–Neoproterozoic basement and the injection of mantle derived magma. As a peraluminous magmatic polymetallic deposit formed in an orogenic setting, the Daxiyingzi Rb–Be deposit represents a potential new direction for prospecting along the northern margin of the North China Craton.

Effect of scanning strategy on microstructure and mechanical properties of a biocompatible Ti–35Nb–7Zr–5Ta alloy processed by laser-powder bed fusion

The influence of scanning strategy (SS) on microstructure and mechanical properties of a Ti–35Nb–7Zr–5Ta alloy processed by laser-powder bed fusion (L-PBF) is investigated for the first time. Three SSs are considered: unidirectional-Y; bi-directional with 79° rotation (R79); and chessboard (CHB). The SSs affect the type and distribution of pores. The highest relative densities and more homogeneous distribution of pores are obtained with R79 and CHB scanning strategies, whereas aligned pores are formed in the unidirectional-Y. The SSs show direct influence on the crystallographic texture with unidirectional-Y strategy showing fiber texture. The R79 strategy results in a weak texture and the CHB scanning strategy forms a randomly oriented heterogeneous grain structure. The lowest Young modulus is obtained with the unidirectional-Y strategy, whereas the R79 strategy results in the highest yield strength. It is shown that the SSs may be used for tuning the microstructure of a beta-Ti alloy in L-PBF. Graphical abstract

Direct energy deposition of Cu–Nb functionally graded layers for dissimilar joining titanium alloys and steels

The heterogeneous compounds of titanium and iron steel are of wide interest in additive manufacturing. To prevent the formation of brittle intermetallic compounds, a layer of Nb and Cu was used. The use of the Nb and Cu interlayer successfully prevents the mixing of Ti and Fe, thus avoiding the formation of FexTiy brittle phases. In the Ti–Nb–(Nb + Cu–10Al) transition interlayer, it was possible to achieve the interlayer without the formation of brittle phases. The static tensile strength of the Grade1/316 L compounds with Nb–(Nb + Cu–10Al) interlayer is 335.5 MPa, the compounds exhibit ductile–brittle fracture.

Дослідження якості зливків цирконієвого сплаву системи Zr–Nb–Ti, виплавлених способом вакуумно-дугового переплаву з витратним електродом

Electrometallurgy Today, 2022, №03. SOVREMENNAYA ELEKTROMETALLURGIYA Quarterly scientific-technical and production journal. ISSN: 2415-8445, Since 1985. Text in Russian, contents and summaries in English. The journal presents the results of theoretical and experimental research carried out at the PWI in the field of electrometallurgy. Special attention is given to electroslag technology (electroslag melting, refining and casting). The journal is divided into the following main sections: electroslag technology; electron beam processes; plasma arc technology; vacuum arc remelting and vacuum induction melting; general problems of special electrometallurgy.

Nb–Ti composite precipitation behaviour and its effect on the growth of austenite grains in peritectic steel

ABSTRACT Refinement of solidification austenite grains is an important way to control the transverse corner cracks. In the present work, the effect of Ti–Nb carbonitride on the refinement of solidification austenite grains is studied by laboratory experiments. Then, the precipitation temperature of Nb–Ti carbonitride is analysed by establishing a thermodynamic model. The results show that the austenite diameter decreases slowly from 1.45 to 1.16 mm (without Ti addition) and significantly decreases from 0.84 to 0.21 mm (with 0.02 wt-% Ti addition) with the Nb content varying from 0.03 to 0.09 wt-%. The pinning pressure provided by composite precipitation greatly increases with 0.02 wt-% Ti addition. The thermodynamic model of Nb–Ti carbonitride shows that the precipitation temperature of (Nb, Ti)(C, N) increases by approximately 20°C compared to Nb(C, N), which is the main reason for the increase in the pinning pressure.

Atomic mobilities and diffusivities in the bcc phase of Ti–Nb–Sn system

Accurate interdiffusion information is essential to control the phase transformation process in metastable β-type titanium alloys. In this work, diffusion behavior in the ternary Ti–Nb–Sn system at 1373 K and 1473 K was experimentally investigated. The ternary interdiffusion coefficients and impurity diffusion coefficients in the bcc Ti–Nb–Sn alloys were determined using the diffusion couple technique, along with the Whittle-Green and Hall methods. Based on the obtained diffusion coefficients, an atomic mobility database for the bcc Ti–Nb–Sn system was established via the CALPHAD (CALculation of PHAse Diagrams) method. In the optimizing procedure, the end members and the binary parameters for the bcc-Ti-Sn system were reassessed. The calculated results using the obtained database agree with the experimental diffusion properties (i.e., interdiffusion, composition-distance profiles and diffusion paths), demonstrating the accuracy of the database developed in this work.