Tracer diffusion of boron in α-Ti and γ-TiAl

Divinski, Sergiy V.; Hisker, F.; Wilger, T.; Friesel, M.; Herzig, Chr.

doi:10.1016/j.intermet.2007.08.008

Cited by 24 publications

(14 citation statements)

References 41 publications

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“…This phenomenon can be related to the formation of TiB particles. Divinski et al [27] investigated the tracer diffusion of boron in pure a-Ti by secondary ion mass spectroscopy using the stable [11] B isotope. They observed that at temperatures below 760 8C, diffusion profiles of acceptable quality could no longer be measured, probably due to the low solubility of boron in a-Ti.…”

Section: The Sintering Processmentioning

confidence: 99%

The Influence of a Small Boron Addition on the Microstructure and Mechanical Properties of Ti‐6Al‐4V Fabricated by Metal Injection Moulding

2011

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The effect of boron additions on the sintering behavior, microstructural development, and mechanical properties of a Ti‐6Al‐4V alloy fabricated by metal injection moulding (MIM) was studied. The addition of boron promotes a significant refinement of the microstructure by changing the microstructure from the typical lamellar to a more equiaxed morphology. The presence of both features: α colonies and α grains were confirmed by electron backscatter diffraction (EBSD) experiments. Furthermore, the pinning effect of TiB particles on grain boundary motion enhances the densification process due to the fact that the separation of pores and grain boundaries is suppressed. As a result of the refinement of the microstructure achieved by adding 0.5 wt% boron to the Ti‐6Al‐4V alloy, excellent tensile (σ0.2 = 787 MPa, UTS = 902 MPa and ε = 12%) and fatigue (endurance limit = 640 MPa) properties were obtained.

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Section: The Sintering Processmentioning

confidence: 99%

The Influence of a Small Boron Addition on the Microstructure and Mechanical Properties of Ti‐6Al‐4V Fabricated by Metal Injection Moulding

2011

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“…Boron has a very low solubility in these phases [48,45,49] and its addition leads to the precipitation of boride particles, especially TiB 2 , which induces a grain refinement, resulting in an improvement of ductility and deformability in the alloys. Tracer diffusion of boron in polycrystalline γ-TiAl was measured by Divinski et al [50], using secondary ion mass spectroscopy. Since boron and oxygen are both light atoms that diffuse in metallic lattices through interstitial sites, the comparison of the computation results with the data from Divinski et al [50] will allow validating our methodology.…”

Section: Introductionmentioning

confidence: 99%

“…Tracer diffusion of boron in polycrystalline γ-TiAl was measured by Divinski et al [50], using secondary ion mass spectroscopy. Since boron and oxygen are both light atoms that diffuse in metallic lattices through interstitial sites, the comparison of the computation results with the data from Divinski et al [50] will allow validating our methodology. Moreover, the computations will allow a better understanding of the atomic-scale processes involved in the boron diffusion and investigating possible anisotropic behaviours, not shown by the available experimental data.…”

Section: Introductionmentioning

confidence: 99%

First-principle study of the solubility and diffusion of oxygen and boron in γ-TiAl

Epifano

Hug

2020

Computational Materials Science

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Solubility and diffusion of boron and oxygen in the γ-TiAl intermetallic compound are herein investigated by firstprinciple calculations. On the basis of the space group of the γ phase, the accommodation of the light atoms in the various interstitial positions is studied by density functional theory. Diffusion coefficients are also obtained from ab initio calculations. Barrier energies for the boron and oxygen diffusion among the different stable interstitial sites are computed using the Nudged Elastic Band method and atomic jumping rates are obtained from the Transitional State Theory. Diffusion coefficients are obtained from the solution of the transport equation in the infinite time limit, using the analytical Multi-State Diffusion method. The methodology here applied is validated by the good agreement between the computed diffusion coefficient of boron and the experimental data available in the literature for this species.

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“…Consequently, the needle‐shape morphology of the TiB particles is associated to the faster diffusion rate in one direction 19. Other investigations20 showed that the particles are formed at around 800 °C by reaction of the elemental boron with the titanium in the alloy powder. Because boron is a very fast diffuser in alpha titanium the powder particles interact quickly during heating up.…”

Section: Resultsmentioning

confidence: 95%

Ti–6Al–4V–0.5B—A Modified Alloy for Implants Produced by Metal Injection Molding

et al. 2011

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Permanent implants have to fulfill a great variety of requirements related to both material and geometry. In addition, manufacturing costs play a role, which is getting steadily more and more important. Metal Injection Molding (MIM) of titanium alloy powders may contribute to the development of implants with higher functionality without increasing the price. High degree of freedom with regard to geometry, high material efficiency, and the possibility to create even porous structures are main benefits from applying this technique. Today, even long‐term implants made from Ti–6Al–4V by MIM are commercially available. However, in order to improve fatigue behavior it is beneficial to perform a minor variation of Ti–6Al–4V by adding a low amount of boron. In this paper the mechanical, biological, and corrosion properties of specimens manufactured from Ti–6Al–4V–0.5B alloy by MIM are presented. In order to exclude unknown reactions in the body environment due to the boron content, corrosion, and biological tests are performed. Tensile and fatigue tests characterize the mechanical properties. Potentiodynamic polarization and electrochemical impedance spectroscopy are done in comparison to wrought and to MIM processed Ti–6Al–4V material. For cell experiments cancellous bone cells are cultured to perform adhesion, proliferation, and viability experiments. The results presented here show that the alloy Ti–6Al–4V–0.5B satisfies all basic needs of a material for highly loaded permanent implants manufactured by MIM.

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Tracer diffusion of boron in α-Ti and γ-TiAl

Cited by 24 publications

References 41 publications

The Influence of a Small Boron Addition on the Microstructure and Mechanical Properties of Ti‐6Al‐4V Fabricated by Metal Injection Moulding

The Influence of a Small Boron Addition on the Microstructure and Mechanical Properties of Ti‐6Al‐4V Fabricated by Metal Injection Moulding

First-principle study of the solubility and diffusion of oxygen and boron in γ-TiAl

Ti–6Al–4V–0.5B—A Modified Alloy for Implants Produced by Metal Injection Molding

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