Influence of thermo-mechanical processing on structure and mechanical properties of a new metastable β Ti–29Nb–2Mo–6Zr alloy with low Young’s modulus

Nunes, Aline Raquel Vieira; Borborema, Sinara; Araújo, Leonardo Sales; Malet, Loïc; Dille, Jean; Almeida, Luiz Henrique de

doi:10.1016/j.jallcom.2019.153078

Cited by 28 publications

(9 citation statements)

References 23 publications

(18 reference statements)

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“…Furthermore, an implant with a low elastic modulus can avoid the stress shielding effect [2,3]. The yield strength/modulus (σ y /E)(× 1000) ratios and moduli of Ti-25Nb-8Sn under various TMT conditions and various β-type Ti alloys [1,9,12,28,37] are shown in Fig. 5 and Table 3.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…As the grain size decreases, the elastic modulus of the alloy decreases significantly from 65 to 43 GPa, and the hardness of the alloy increases from 260 to 320 HV. Nunes et al [28] reported that with the percentage of cold rolling up to 90 %, the hardness of Ti-29Nb--2Mo-6Zr increased from 228 to 278 HV, and its elastic modulus decreased from 93 GPa to 76 GPa. Also, they found that a greater amount of α phase in Ti-29Nb--2Mo-6Zr was induced with increasing cold-rolling percentage.…”

Section: Introductionmentioning

confidence: 99%

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Effect of thermomechanical treatment on structure and properties of metastable Ti-25Nb-8Sn alloy

Hsu¹,

Wong²,

Chen³

et al. 2021

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In this work, different thermomechanical treatment conditions were used to improve the mechanical performances of Ti-25Nb-8Sn. During cold rolling treatment (50, 75, and 90 %), as-cast Ti-25Nb-8Sn underwent a stress-induced phase transformation from a single β phase to a three-phase structure of α + β + ωstr. After the subsequent aging treatment, Ti-25Nb--8Sn presents three-phase β + α + ωiso (at 250 and 400 • C, for 30 min) and two-phase β + α (at 600 • C, for 30 min). At lower aging temperatures (250 and 400 • C), yield strength/modulus (× 1000) ratios of Ti-25Nb-8Sn are dramatically improved with a maximum increase of 143 %, from 9.06 (as-cast) to 16.2-22.0. Under various thermomechanical treatment conditions in this study, the results show that Ti-25Nb-8Sn has excellent yield strength/modulus (× 1000) ratio (∼ 22) and corrosion resistance after 90 % cold rolling and subsequent aging treatment at 250 and 400 • C for 30 min. K e y w o r d s : titanium alloys, biomaterials, cold working, aging, hardness

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Section: Mechanical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of thermomechanical treatment on structure and properties of metastable Ti-25Nb-8Sn alloy

Hsu¹,

Wong²,

Chen³

et al. 2021

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“…A single β-phase state with a favorable {001} β <110> β crystallographic texture provides the highest recovery strains in these alloys [8,11,12]. The most effective tool to control the structural characteristics of these alloys is thermomechanical treatment (TMT) [10][11][12][13][14][15][16][17]. In a number of works [12,17], TMT combining hot/cold rotary forging and post-deformation annealing (PDA), was applied to Ti- (18)(19)Zr- (14)(15)Nb SMAs with the objective of forming a long-length bar stock 3-8 mm in diameter for bone-implant fabrication.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cold Drawing and Annealing in Thermomechanical Treatment Route on the Microstructure and Functional Properties of Superelastic Ti-Zr-Nb Alloy

Kudryashova,

Lukashevich,

Derkach

et al. 2023

Materials

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In this study, a superelastic Ti-18Zr-15Nb (at. %) alloy was subjected to thermomechanical treatment, including cold rotary forging, intermediate annealing, cold drawing, post-deformation annealing, and additional low-temperature aging. As a result of intermediate annealing, two structures of β-phase were obtained: a fine-grained structure (d ≈ 3 µm) and a coarse-grained structure (d ≈ 11 µm). Cold drawing promotes grain elongation in the drawing direction; in a fine-grained state, grains form with a size of 4 × 2 µm, and in a coarse-grained state, they grow with a size of 16 × 6 µm. Post-deformation annealing (PDA) at 550 °C for 30 min leads to grain sizes of 5 µm and 3 µm, respectively. After PDA at 550 °C (30 min) in the fine-grained state, the wire exhibits high tensile strength (UTS = 624 MPa), highest elongation to failure (δ ≥ 8%), and maximum difference between the dislocation and transformation yield stresses, as well as the highest superelastic recovery strain (εrSE ≥ 3.3%) and total elastic + superelastic recovery strain (εrel+SE ≥ 5.4%). Additional low-temperature aging at 300 °C for 30–180 min leads to ω-phase formation, alloy hardening, embrittlement, and a significant decrease in superelastic recovery strain.

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“…The structure, phase composition, texture, and consequently, the mechanical and functional properties of SMAs are commonly controlled by thermomechanical treatments (TMT) [6]. Combining the radial shear rolling (RSR) and rotary forging (RF) processes allows the formation of a favorable phase composition, structure and texture in semi-finished SMA products [7,8].…”

Section: Introductionmentioning

confidence: 99%

Effect of forging temperature on the structure, mechanical and functional properties of superelastic Ti-Zr-Nb bar stock for biomedical applications

et al. 2022

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Ti-Zr-Nb shape memory alloys exhibit a unique combination of properties that make them suitable for bone implants: low Young's modulus, superelastic behavior, superior corrosion resistance, and non-toxicity of all the constitutive elements. In this study, superelastic Ti-19Zr-14Nb (at.%) alloy was subjected to a combination of radial shear rolling at 900°C and rotary forging in a temperature range from 500 to 700°C to form long-length bar stocks for bone implants fabrication. Features of the grain structure, phase composition, mechanical and functional properties of the long-length bar stocks were analyzed using light microscopy, X-ray analysis, as well as during mechanical and functional tests. It was shown that after radial shear rolling at 900°C, a heterogeneous grain structure was formed over the cross-section of the bar stock, and this structure was inherited after the subsequent rotary forging at 500°C. With an increase in the forging temperature, the structural heterogeneity is eliminated and the grain size increases, while the hardness and strength characteristics of the material decrease. After rotary forging at 700°C, the alloy manifests the best combination of structural, mechanical, and functional characteristics. In this state, the long-length bar stock demonstrates a homogeneous grain structure with a certain fraction of a dynamically polygonized substructure of β-phase, a satisfactory strength (UTS ≈ 580 MPa), a low Young's modulus (E ≈ 35 GPa), the high difference between dislocation and phase yield strength (Δσ ≈ 280 MPa), and a relatively large amount of superelastic recovery strain (ε r SE max ≈ 3.1%).

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Influence of thermo-mechanical processing on structure and mechanical properties of a new metastable β Ti–29Nb–2Mo–6Zr alloy with low Young’s modulus

Cited by 28 publications

References 23 publications

Effect of thermomechanical treatment on structure and properties of metastable Ti-25Nb-8Sn alloy

Effect of thermomechanical treatment on structure and properties of metastable Ti-25Nb-8Sn alloy

Effect of Cold Drawing and Annealing in Thermomechanical Treatment Route on the Microstructure and Functional Properties of Superelastic Ti-Zr-Nb Alloy

Effect of forging temperature on the structure, mechanical and functional properties of superelastic Ti-Zr-Nb bar stock for biomedical applications

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