Super-elastic titanium alloy with unstable plastic deformation

Hao, Yulin; Li, S. J.; Sun, Shumin; Zheng, Ce; Hu, Qing‐Miao; Yang, Rui

doi:10.1063/1.2037192

Cited by 214 publications

(125 citation statements)

References 14 publications

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“…The need for a metallic implant material combining superelasticity with a biocompatibility comparable to that of pure titanium represents the main incentive for ongoing research in the field of -type Ti-based superelastic alloys [1]- [6]. Ternary and quaternary Ti-Nb-based alloys have been extensively investigated over the last ten years and the results confirm the possibility of producing Ni-free, Ti-based alloys with superelasticity thanks to reversible to α′′ martensitic transformation [7].…”

Section: Introductionmentioning

confidence: 74%

Mechanical properties of porous metastable beta Ti–Nb–Zr alloys for biomedical applications

Braïlovski

Прокошкин

Gauthier

et al. 2013

Journal of Alloys and Compounds

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Mechanical properties of porous metastable beta Ti-Nb-Zr alloys for biomedical applications Braïlovski, V.; Prokoshkin, S.; Gauthier, M.; Inaekyan, K.; Dubinskiy, S. melting. The obtained ingots were divided into two batches: the first subjected to cold rolling (CR) from 30 to 85% of thickness reduction, and subsequent annealing in the 450 to 600°C temperature range (1h). Regardless of the CR intensity, Ti-Nb-Zr samples subjected to 600°C annealing showed the highest fatigue resistance during roomtemperature cumulative cycling due to the stress-induced martensitic transformation occurring in the polygonized dislocation substructure (average subgrain size ∼ 100 nm). The second batch was atomized to produce 100-micronsize powders in order to manufacture open-cell porous material (cell size vary from 136 to 561 microns) of 46% porosity by means of powder metallurgy using a polymer-based foaming process. Tensile, compression and bending testing were performed at RT on foam samples annealed at 450 to 600°C (1h). Results indicated that Young's modulus of Ti-Nb-Zr foams significantly decreases as compared to the as-sintered material: when annealing temperature increases from 450 to 600°C, Young's modulus decreases from 10±2 GPa to 6±1 GPa. Under the same testing conditions, Ti-CP foams produced by the same technology and having similar porosity remain fairly insensible to post-sintering annealing.

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Section: Introductionmentioning

confidence: 74%

Mechanical properties of porous metastable beta Ti–Nb–Zr alloys for biomedical applications

Braïlovski

Прокошкин

Gauthier

et al. 2013

Journal of Alloys and Compounds

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“…Ternary and quaternary Ti-Nb-based alloys have been extensively investigated during the last several years and the results confirm the possibility of producing Ni-free, Ti-based alloys with superelasticity thanks to reversible β to α″ martensitic transformation [4][5][6][7][8][9][10]. These materials have joined the family of the previously-developed low-modulus near-β and β-type titanium alloys containing non-toxic elements such as Nb, Ta, and Zr, but without superelasticity [11,12].…”

Section: Introductionmentioning

confidence: 86%

Bulk and porous metastable beta Ti–Nb–Zr(Ta) alloys for biomedical applications

Braïlovski

Прокошкин

Gauthier

et al. 2011

Materials Science and Engineering: C

187

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Bulk and porous metastable beta Ti-Nb-Zr(Ta) alloys for biomedical applications Brailovski, V.; Prokoshkin, S.; Gauthier, M.; Inaekyan, K.; Dubinskiy, S.; Petrzhik, M.; Filonov, M.Contact us / Contactez nous: nparc.cisti@nrc-cnrc.gc.ca. In this work, metastable beta Ti-Nb-Zr(Ta) ingots were manufactured by vacuum arc melting. The ingots thus obtained were divided into two batches: the first subjected to cold rolling (CR) from 30 to 85% of thickness reduction and subsequent annealing in the 450 to 900°C temperature region, and the second atomized to produce 100 μm size powders. This powder was used to manufacture open-cell porous material. Regardless of the CR intensity, Ti-(18…20)Nb-(5…6)Zr (at.%) samples subjected to 600°C (1 h) annealing showed a significant material softening due to the stress-induced martensitic transformation. The Young's modulus of these alloys varied between 45 and 55 GPa, and the yield stress, between 300 and 500 MPa. The obtained Young's moduli, which are comparable to 55-66 GPa of concurrent beta-titanium alloys and 45-50 GPa of superelastic Ti-Ni alloys, come close to those of cortical bones. Compression testing of the porous material as a function of porosity (from~45 to 66%) and interconnected cell size (d 50 from 300 to 760 μm) showed the following properties: Young's modulus from 7.5 to 3.7 GPa, which comes close to that of trabecular bones, and ultimate compression strength, of from 225 to 70 MPa.

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“…Ti-24Nb-4Zr-8Sn (abbreviated as Ti2448 from its chemical composition in weight percent) alloy is a multifunctional β-type titanium alloy developed for biomedical applications [7,8]. Its high strength (~850 MPa), low modulus (~42 GPa) and good biocompatibility make it suitable to produce orthopedic implants.…”

Section: Introductionmentioning

confidence: 99%

Weak fatigue notch sensitivity in a biomedical titanium alloy exhibiting nonlinear elasticity

et al. 2017

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It is well known that metallic materials exhibit worse fatigue damage tolerance as they behave stronger in strength and softer in modulus. This raises concern on the long term safety of the recently developed biomechanical compatible titanium alloys with high strength and low modulus. Here we demonstrate via a model alloy, Ti-24Nb-4Zr-8Sn in weight percent, that this group of multifunctional titanium alloys possessing nonlinear elastic deformation behavior is tolerant in fatigue notch damage. The results reveal that the alloy has a high strength-to-modulus (σ/E) ratio reaching 2% but its fatigue notch sensitivity (q) is low, which decreases linearly from 0.45 to 0.25 as stress concentration factor increases from 2 to 4. This exceeds significantly the typical relationship between σ/E and q of other metallic materials exhibiting linear elasticity. Furthermore, fatigue damage is characterized by an extremely deflected mountain-shape fracture surface, resulting in much longer and more tortuous crack growth path as compared to these linear elastic materials. The above phenomena can be explained by the nonlinear elasticity and its induced stress relief at the notch root in an adaptive manner of higher stress stronger relief. This finding provides a new strategy to balance high strength and good damage tolerance property of metallic materials.

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Super-elastic titanium alloy with unstable plastic deformation

Cited by 214 publications

References 14 publications

Mechanical properties of porous metastable beta Ti–Nb–Zr alloys for biomedical applications

Mechanical properties of porous metastable beta Ti–Nb–Zr alloys for biomedical applications

Bulk and porous metastable beta Ti–Nb–Zr(Ta) alloys for biomedical applications

Weak fatigue notch sensitivity in a biomedical titanium alloy exhibiting nonlinear elasticity

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