Elastic softening of β-type Ti–Nb alloys by indium (In) additions

Calin, Mariana; Helth, Arne; Moreno, José Julio Gutiérrez; Bönisch, Matthias; Brackmann, Varvara; Giebeler, Lars; Gemming, Thomas; Lekka, Christina; Gebert, A.; Schnettler, Reinhard; Eckert, J.

doi:10.1016/j.jmbbm.2014.07.010

Cited by 79 publications

(35 citation statements)

References 42 publications

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“…The fraction of the secondary phase increased with x value. Nb is known to stabilize the β-phase Ti and Ti-based alloys with the body-centered cubic (BCC) structure [21][22][23]. So, in the present study, Nb seems to promote the segregation of the secondary phase, causing the increase in the intensity of the diffraction peak around 41.0 degree in Figure 1.…”

Section: Resultsmentioning

confidence: 57%

Electrochemical Properties of Nb-Substituted Zr-Ti-Ni Hydrogen Storage Alloy Negative Electrodes for Nickel-Metal Hydride Batteries

Matsuyama

Takito²,

Kozuka³

et al. 2018

Metals

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Abstract:Crystal structure, pressure-composition isotherms and electrochemical properties of the Zr 0.6−x Ti 0.4 Nb x Ni (x = 0.01, 0.02, and 0.05) alloys were investigated. Their X-ray diffraction profiles demonstrated that all the Zr 0.6−x Ti 0.4 Nb x Ni alloys consisted of the primary phase with the B33-type orthorhombic structure and the secondary phase with the B2-type Ti 0.6 Zr 0.4 Ni cubic structure. Rietveld refinement demonstrated that the atomic fraction of the secondary phase increased with the Nb content. The Zr 0.6−x Ti 0.4 Nb x Ni alloys were lower in hydrogen storage capacity than the Nb-free Zr 0.6 Ti 0.4 Ni alloy due to an increase in the abundance of the secondary phase. In the charge-discharge tests with the Zr 0.6−x Ti 0.4 Nb x Ni alloy negative electrodes, all the initial discharge curves had two potential plateaus due to the electrochemical hydrogen desorption of trihydride to monohydride and monohydride to alloy of the primary phase. The total discharge capacities at 333 and 303 K for the Zr 0.58 Ti 0.4 Nb 0.02 Ni alloy negative electrode were 384 and 335 mAh g −1 , respectively, which were higher than those of the other Zr 0.6−x Ti 0.4 Nb x Ni and Zr 0.6 Ti 0.4 Ni alloy negative electrodes.

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Section: Resultsmentioning

confidence: 57%

Electrochemical Properties of Nb-Substituted Zr-Ti-Ni Hydrogen Storage Alloy Negative Electrodes for Nickel-Metal Hydride Batteries

Matsuyama

Takito²,

Kozuka³

et al. 2018

Metals

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“…The samples produced by hot-pressing as well as by hot-pressing followed by sintering have a low microporosity and a high density which is close to the theoretical density of the alloy. These samples are deformed like bulk cast samples, as described in a work by Calin et al [39], where the stressstrain curves demonstrated a remarkable strain hardening, but do not show the double yielding effect originating from a stress-induced α″-martensite formation. This can be also attributed to the samples produced by hot-pressing as well as hot-pressing followed by sintering.…”

Section: Resultsmentioning

confidence: 89%

Mechanical and Corrosion Behavior of New Generation Ti-45Nb Porous Alloys Implant Devices

et al. 2016

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Strategies to improve the mechanical compatibility of Ti-based materials for hard tissue implant applications are directed towards significant stiffness reduction by means of the adjustment of suitable β-phases and porous device architectures. In the present study, the effect of different compaction routes of the gas-atomized β-Ti-45Nb powder on the sample architecture, porosity, and on resulting mechanical properties in compression was investigated. Green powder compacted and sintered at 1000 • C had a porosity varying between 8% and 12%, strength between 260 and 310 MPa, and Young's modulus ranging between 18 and 21 GPa. Hot pressing of the powder without or with subsequent sintering resulted in microporosity varying between 1% and 3%, ultimate strength varying between 635 and 735 MPa, and Young's modulus between 55 and 69 GPa. Samples produced with NaCl space-holder by hot-pressing resulted in a macroporosity of 45% and a high strength of >200 MPa, which is higher than the strength of a human cortical bone. Finally, the corrosion tests were carried out to prove that the presence of residual NaCl traces will not influence the performance of the porous implant in the human body.

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“…However, most of these alloys show higher Young's modulus (>70 GPa) compared to the Young's modulus of the cortical bone (10-30 GPa) [2]. These differences cause significant stress shielding [3] due to a mechanical stress mismatch between the implant and the bone, results in loosening of the implant or potential mismatch of the implant in the human body [4,5].…”

Section: Introductionmentioning

confidence: 99%

Selective Laser Melting of Ti-45Nb Alloy

Schwab

Prashanth

Löber

et al. 2015

Metals

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Ti-45Nb is one of the potential alloys that can be applied for biomedical applications as implants due to its low Young's modulus. Ti-45Nb (wt.%) gas atomized powders were used to produce bulk samples by selective laser melting with three different parameter sets (energy inputs). A β-phase microstructure consisting of elliptical grains with an enriched edge of titanium was observed by scanning electron microscopy and X-ray diffraction studies. The mechanical properties of these samples were evaluated using hardness and compression tests, which suggested that the strength of the samples increases with increasing energy input within the range considered.

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Elastic softening of β-type Ti–Nb alloys by indium (In) additions

Cited by 79 publications

References 42 publications

Electrochemical Properties of Nb-Substituted Zr-Ti-Ni Hydrogen Storage Alloy Negative Electrodes for Nickel-Metal Hydride Batteries

Electrochemical Properties of Nb-Substituted Zr-Ti-Ni Hydrogen Storage Alloy Negative Electrodes for Nickel-Metal Hydride Batteries

Mechanical and Corrosion Behavior of New Generation Ti-45Nb Porous Alloys Implant Devices

Selective Laser Melting of Ti-45Nb Alloy

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