Nanostructured titanium-based materials for medical implants: Modeling and development

Mishnaevsky, Leon; Левашов, Е. А.; Valiev, Ruslan Z.; Segurado, J.; Sabirov, I.; Enikeev, Nariman A.; Прокошкин, С. Д.; Solov’yov, Andrey V.; Korotitskiy, Andrey; Gutmanas, E.Y.; Gotman, I.; Rabkin, Eugen; Psakh’e, Sergey; Dluhoš, L.; Seefeldt, Marc; Smolin, Alexey Yu.

doi:10.1016/j.mser.2014.04.002

Cited by 236 publications

(161 citation statements)

References 188 publications

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“…With view on the possibility of additional diffusion routes in triple junctions contributing to the accommodation of GB sliding, Rabkin and colleagues [2] derived equations for the strain rate of nanocrystalline material due to GB sliding which take into account the triple junction diffusion controlled sliding. They have shown that dependence of deformation rate on the grain size is stronger in the case of triple junction diffusion controlled sliding than in the case when GB sliding is controlled by the GB diffusion.…”

Section: Grain Boundary Slidingmentioning

confidence: 99%

“…The extraordinary properties of nanocrystalline and ultrafine grained metallic materials (i.e., materials with the grain sizes of the order of several to several hundred nanometers) include superductility at room temperature, high hardness and high strength to hardness value (which might be 2…7 times higher than in coarse grained materials), lower elastic modulus, negative Hall-Petch slope, enhanced strain rate sensitivity and difference between tensile and compression response [1][2][3][4][5]. The yield strength of nanocrystalline materials can be up to 5…10 times higher than of coarse-grained materials [6].…”

Section: Introductionmentioning

confidence: 99%

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Micromechanical modelling of nanocrystalline and ultrafine grained metals: A short overview

Mishnaevsky

Левашов

2015

Computational Materials Science

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Abstract:An overview of micromechanical models of strength and deformation behaviour of nanostructured and ultrafine grained metallic materials is presented. Composite models of nanomaterials, polycrystal plasticity based models, grain boundary sliding, the effect of nonequilibrium grain boundaries and nanoscale properties are discussed and compared. The examples of incorporation of peculiar nanocrystalline effects (like large content of amorphous or semi-amorphous grain boundary phase, partial dislocation GB emission/glide/GB absorption based deformation mechanism, diffusion deformation, etc.) into continuum mechanical approach are given. The possibilities of using micromechanical models to explore the ways of the improving the properties of nanocrystalline materials by modifying their structures (e.g., dispersion strengthening, creating non-equilibrium grain boundaries, varying the grain size distributions and gradients) are discussed.Keywords: Micromechanics; Finite element modelling; Nanomaterials; Nanocrystalline materials IntroductionDuring recent decades, growing interest of scientific community has been attracted to the nanostructured materials. The expectations on nanostructuring as a way to enhance material performances and to improve competing materials properties are very high, and some of them have been delivered, indeed.The extraordinary properties of nanocrystalline and ultrafine grained metallic materials (i.e., materials with the grain sizes of the order of several to several hundred nanometers) include superductility at room temperature, high hardness and high strength 2 to hardness value (which might be 2…7 times higher than in coarse grained materials), lower elastic modulus, negative Hall-Petch slope, enhanced strain rate sensitivity and difference between tensile and compression response [1][2][3][4][5]. The yield strength of nanocrystalline materials can be up to 5…10 times higher than of coarse-grained materials [6]. Other peculiar effect of nanocrystalline materials are the deviation fromHall-Petch relation at ultrafine and nanoscale grain sizes (below 100 nm), which goes into negative Hall Petch slope at about 10 nm, as well as asymmetry of tensile and compressive behaviour and enhanced diffusion properties [7].In order to predict the service properties of the materials and to explore the potential and reserves of their improvement, computational models linking the macroscale (service) In this paper, we present an overview of micromechanical models of nanocrystalline and ultrafine grained materials, their mechanical behaviour, deformation and strength.Composite models, crystal plasticity based models, grain boundary sliding, the effect of non-equilibrium grain boundaries, etc. are reviewed. The main constraints and challenges in the considered models are discussed. Composite models of nanocrystalline metallic materialsThe main structural feature of nanocrystalline and ultrafine grained materials, apart from the small grain sizes, is the high relative volume of grain boundary surface pha...

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Section: Grain Boundary Slidingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Micromechanical modelling of nanocrystalline and ultrafine grained metals: A short overview

Mishnaevsky

Левашов

2015

Computational Materials Science

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“…또한 기존 응집제들은 많은 하수슬러지를 발생시키는 문제점을 가지고 있다 (Kim et al, 2013 (Shon et al, 2007;Upton and Buswell, 1937). 티타늄은 인체 골 격, 생물의학 장비로 사용할 정도로 생체에 대해 거부반응 이 없고, 안정적인 물질로 설명되고 있다 (Mishnaevsky et al, 2014;Sun et al, 2013 (Kim et al, 1998;Kim et al, 2011). [TiCl4]를 0.45 mM로 고정하고 초기 pH에 따른 인 제거 효율을 살펴보았다.…”

Section: 합하도록 인을 처리하기 위해서는 물리･화학적 처리방법의unclassified

Optimization of TiCl₄Concentration and Initial pH for Phosphorus Removal in Synthetic Wastewater

Shin¹,

Kim²,

Ahn³

2015

Journal of Korean Society on Water Environment

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This study experimentally determined the effect of titanium tetrachloride (TiCl4) concentration ([TiCl4]) (0.25-0.55 mM) and initial pH (3-11) on phosphorus (P) removal in synthetic wastewater (2 mg P/L). The P removal efficiency increased when [TiCl4] increased. The P removal efficiency showed a parabolic trend with an inflection point at pH 7. At the molar ratio of TiCl4 and P>6.2, the P removal efficiency was over 90% and the residual P concentration was less than 0.2 mg/L. Within the design boundaries, the complete P removal could be achieved at 7.0≤initial pH≤8.5 and 0.43≤[TiCl4]≤0.55 mM. The final pH was over 5.8 at initial pH≥7.7 and [TiCl4]≥0.35 mM. The results showed that TiCl4 was effective in P removal in water so that it could be an alternative chemical for P removal.

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“…It is now possible to predict the mechanical behavior by FEM of several medical devices (Wu, 2011) or medical multiphasic alloys, as nanostructured titanium-based materials (Mishnaevsky et al, 2014). Morris (1996) has proposed a methodology in which the main error sources of FE Analysis are characterized; it is useful for testing the reliability of devices in order to get their certification and qualification.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of a nanoporous membrane used in implantable medical devices. Correlation between experimental characterization and 2D numerical simulation

Cristofari

Piotrowski

Pesci

2017

Journal of the Mechanical Behavior of Biomedical Materials

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. A B S T R A C TNanoporous membranes are used for the elaboration of implantable medical devices. In order to guaranty their integrity after implantation in a patient body, it is necessary to characterize the microstructure and the mechanical behavior of such membranes. They present randomly distributed pores around 1 µm in diameter at the surface. X-ray nanotomography permits to get the geometry of the pores through the thickness with a reduction of the diameter in the core. A multiscale study is done to characterize the membranes: macroscopic tensile tests permit to get the behavior law of the non porous material and in situ tensile tests are carried on in a Scanning Electron Microscope in order to observe the evolution of pores and cracks during loading. A 2D Finite Element Model is also developed in parallel. The confrontation between experiments and numerical simulations permit to validate the accuracy of the model. The latter is then used to simulate several types of loadings considering various pore distributions and sizes.

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Nanostructured titanium-based materials for medical implants: Modeling and development

Cited by 236 publications

References 188 publications

Micromechanical modelling of nanocrystalline and ultrafine grained metals: A short overview

Micromechanical modelling of nanocrystalline and ultrafine grained metals: A short overview

Optimization of TiCl₄Concentration and Initial pH for Phosphorus Removal in Synthetic Wastewater

Mechanical properties of a nanoporous membrane used in implantable medical devices. Correlation between experimental characterization and 2D numerical simulation

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Nanostructured titanium-based materials for medical implants: Modeling and development

Cited by 236 publications

References 188 publications

Micromechanical modelling of nanocrystalline and ultrafine grained metals: A short overview

Micromechanical modelling of nanocrystalline and ultrafine grained metals: A short overview

Optimization of TiCl4Concentration and Initial pH for Phosphorus Removal in Synthetic Wastewater

Mechanical properties of a nanoporous membrane used in implantable medical devices. Correlation between experimental characterization and 2D numerical simulation

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Product

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Optimization of TiCl₄Concentration and Initial pH for Phosphorus Removal in Synthetic Wastewater