Effect of a combined thermomechanical treatment on the microstructure, texture and superelastic properties of Ti-18Zr-14Nb alloy for orthopedic implants

Kudryashova, A. A.; Sheremetyev, V.; Lukashevich, Konstantin; Чеверикин, В. В.; Inaekyan, К.; Галкин, С. П.; Прокошкин, С. Д.; Braïlovski, Vladimir

doi:10.1016/j.jallcom.2020.156066

Cited by 38 publications

(20 citation statements)

References 34 publications

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“…During functional cyclic tests, this structure manifests a favorable combination of extended fatigue life and a relatively low value of residual (unrecoverable) strains [7]. However, the next study [8] showed that multi-stage RF at 800°C with incrementally increasing strains to obtain bars of smaller diameter led to the surface quality deterioration caused by significant oxidation at this temperature.…”

Section: Introductionmentioning

confidence: 90%

“…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]. Applying radial shear rolling allows the efficient transformation of an ingot into a 10 -12 mm diameter bar with a refined and compacted structure along the bar cross-section [9].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 90%

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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“…These alloys, composed of non-toxic components, exhibit a unique combination of high biomechanical compatibility (low Young's modulus and superelastic behavior) with excellent corrosion resistance. It is known that conventional thermomechanical treatment, due to the control of the structure of Ti-Zr-Nb SMAs, reduces Young’s modulus, functional fatigue resistance, and increases strength [5] , [6] . However, an additional increase in the strength characteristics of these alloys is necessary.…”

Section: Introductionmentioning

confidence: 99%

Effect of HPT and accumulative HPT on structure formation and microhardness of the novel Ti18Zr15Nb alloy

et al. 2021

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“…It appears evident that new opportunities for the development of high-performance biomedical implants could be envisaged by synergistically combining the exceptional functional properties of superelastic nickel-free Ti alloys with the design flexibility offered by additive manufacturing. It should, however, be noted that the functional properties of SMAs (temperature range of martensitic transformation, recoverable strains and recovery stresses) are much more structural and, therefore, processing-dependent than the mechanical properties of common materials [13,14]. For example, increasing laser energy density of the LPBF process may result not only in higher impurity content but also in the evaporation of certain alloy elements [7], which makes the control of the SMA transformation temperature range difficult.…”

Section: Introductionmentioning

confidence: 99%

Control of Density and Grain Structure of a Laser Powder Bed-Fused Superelastic Ti-18Zr-14Nb Alloy: Simulation-Driven Process Mapping

Braïlovski

Kalinicheva

Letenneur

et al. 2020

Metals

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This study focuses on the control of density and grain structure of a superelastic Ti-18Zr-14Nb (at. %) alloy subjected to laser powder bed fusion. It starts with the production and characterization of a Ti-18Zr-14Nb powder feedstock and printing of a series of calibration specimens. These specimens are next subjected to chemical, structural, phase and texture analyses in order to collect experimental data needed to build simulation-driven processing maps in the laser energy density–material build rate coordinates. The results of this study prove that, once calibrated, the simulation-driven processing maps can be used to relate the main LPBF parameters (laser power, scanning speed, hatching distance and layer thickness) to the density and grain structure of the printed material, and the process productivity (build rate). Even though this demonstration is made for a specific material–system combination (TiNbZr & TruPrint 1000), such a process mapping is feasible for any material–system combination and can, therefore, be exploited for the process optimization purposes and for manufacturing of functionally graded materials or parts with intentionally seeded porosity.

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Effect of a combined thermomechanical treatment on the microstructure, texture and superelastic properties of Ti-18Zr-14Nb alloy for orthopedic implants

Cited by 38 publications

References 34 publications

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

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

Effect of HPT and accumulative HPT on structure formation and microhardness of the novel Ti18Zr15Nb alloy

Control of Density and Grain Structure of a Laser Powder Bed-Fused Superelastic Ti-18Zr-14Nb Alloy: Simulation-Driven Process Mapping

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