Effect of cold rolling and heat-treatment on the microstructure and mechanical properties of β-titanium Ti-25Nb-25Zr alloy

Vajpai, Sanjay Kumar; Sharma, Bhupendra; Ota, Masaki; Ameyama, Kei

doi:10.1016/j.msea.2018.09.002

Cited by 30 publications

(13 citation statements)

References 33 publications

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“…With increasing annealing temperature, strength increases, however, the relative elongation is minimal for the samples annealed at 600 • C. It can be assumed that at this temperature, the metastable β-phase begins to decay non-uniformly in grain volume, which leads to a decrease in the plasticity characteristics. After a further increase in the annealing temperature, the metastable β-phase decomposes evenly (turning into stable beta or mixed beta + alpha), which increases the strength and plasticity characteristics [38,39]. In this work, the tensile strength of the alloy after annealing the wire at 800 • C turned out to be of the order of 840 MPa, the proof strength, plastic extension Rp0.2-635 MPa (Table 1), which is comparable or higher than the parameters for Ti-6Al-4V [40], Ti-Nb-Sn [31,41], Ti-25Ta [42] or Ti-Nb [43].…”

Section: Discussionmentioning

confidence: 99%

Obtaining a Wire of Biocompatible Superelastic Alloy Ti–28Nb–5Zr

et al. 2020

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Using the methods of electric arc melting, intermediate heat treatments, and consecutive intensive plastic deformation, a Ti–Nb–Zr alloy wire with a diameter of 1200 μm was obtained with a homogeneous chemical and phase (β-Ti body-centered crystal lattice) composition corresponding to the presence of superelasticity and shape memory effect, corrosion resistance and biocompatibility. Perhaps the wire structure is represented by grains with a nanoscale diameter. For the wire obtained after stabilizing annealing, the proof strength Rp0.2 is 635 MPa, tensile strength is 840 MPa and Young’s modulus is 22 GPa, relative elongation is 6.76%. No toxicity was detected. The resulting wire is considered to be promising for medical use.

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Section: Discussionmentioning

confidence: 99%

Obtaining a Wire of Biocompatible Superelastic Alloy Ti–28Nb–5Zr

et al. 2020

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“…When the holding time increased to 120 min, the carburized region of ETSC120 sample not only exhibited relatively uniform layer but also reached to 100 μm in thickness. In addition, it was worth noting that coarse grains appeared in Ti 13 Nb 13 Zr alloy substrate after 120 min carburization at 1,500 K. Vajpai et al [28] considered that the increasing grain size would result in decreasing strength values and increasing ductility for Ti 25 Nb 25 Zr alloy. In addition, it was found that fine acicular α phase precipitated within prior β grain during the cooling process, resulting in a basket-wave morphology.…”

Section: The Growth Mechanism Of Tic Ceramic Layermentioning

confidence: 99%

Structure, tribological properties, and the growth mechanism of in-situ generated TiC in titanium cermet

et al. 2021

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Titanium cermet combining metallic toughness with ceramic wear resistance has been proven to be a potential candidate for implanted joint material. In this work, titanium cermet was synthesized by means of the elevated temperature solid carburizing technology. The Ti13Nb13Zr alloy surface was found to be converted into TiC ceramic layer combined with a carbon strengthened diffusion zone underneath. The overall thickness of the carburized region grew to about 100 µm after 120 min carburization at 1,500 K. In order to clarify the growth behaviors of TiC ceramic layer, a growth mechanism is proposed. At the beginning of carburizing process, carbonaceous gas decomposed from carburizer due to high temperature and then converted to free atomic carbons through reduction reaction. Then, in-situ generated TiC ceramic layer possessing certain thickness formed on the surface, meanwhile, the inner carbon diffusion zone also grew inwards due to physical diffusion of carbon, and finally forming a gradient carbon distribution. In addition, the tribological behaviors of the new materials were evaluated through reciprocating ball-on-plate sliding wear tests in bovine calf serum. Although there was an increase in friction coefficient, the wear rate decreased by 59.6% due to the formation of the wear-resistant TiC ceramic layer. The wear mechanisms evolved from severe abrasive wear for bare Ti13Nb13Zr alloy to mild adhesive wear for titanium cermet.

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“…The area consisted of 12 grains, including seven α-phase grains and five β-phase grains. The grains were numbered (i.e., 1 , 2 , 3 , and so on) and the excel file including crystal structure, centroid position, Euler angles (ϕ 1 , φ, ϕ 2 ) was output by channel5 software. Based on the RGB values of the image pixels, a 2D finite element model was developed.…”

Section: Crystal Plasticity Modelsmentioning

confidence: 99%

“…It has been reported that the mechanical properties of titanium and titanium alloys are greatly influenced by their microstructure [1][2][3]. In particular, the effect of the phase ratio, size and morphology of the α and β phases makes it more difficult to accurately regulate their mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Crystal Plasticity Finite Element Method for Slip Systems Evolution Analysis of α/β Duplex Titanium Alloys during Quasi-Static Tensile Testing

et al. 2020

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The crystal plasticity finite element method, modeled on a realistic microstructure image, was developed to investigate the evolution of slip systems in grains of α/β titanium alloys during quasi-static tensile testing. By analyzing the data of slip evolution of simulation during the overall plastic deformation process, it was found that the prismatic slip systems in the α phase and the {112} <111> slip systems in the β phase played a leading role. By calculating the Schmid factors, it was found that the values calculated from the local stress, which was represented by major principal stress, were larger than the values calculated from the primary uniaxial tensile direction, which was due to the deviation of the local stress direction from the primary uniaxial tensile direction. Furthermore, the deviation of local stress of α phase was different from that of β phase, which was related to the deformation mechanism. During the deformation, the stress and strain were concentrated in the grains of the α phase, producing a driving effect on the neighboring grains of the β phase. Subsequently, the incompatible deformation produced the concentration of strain at the grain/interphase boundary, thus strengthening the grain interactions and leading to the deviation.

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Effect of cold rolling and heat-treatment on the microstructure and mechanical properties of β-titanium Ti-25Nb-25Zr alloy

Cited by 30 publications

References 33 publications

Obtaining a Wire of Biocompatible Superelastic Alloy Ti–28Nb–5Zr

Obtaining a Wire of Biocompatible Superelastic Alloy Ti–28Nb–5Zr

Structure, tribological properties, and the growth mechanism of in-situ generated TiC in titanium cermet

Crystal Plasticity Finite Element Method for Slip Systems Evolution Analysis of α/β Duplex Titanium Alloys during Quasi-Static Tensile Testing

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