Nanostructured SPD Processed Titanium for Medical Implants

Valiev, Ruslan Z.; Semenova, Irina P.; Jakushina, Enja; Латыш, В. В.; Rack, H.J.; Lowe, Terry C.; Petruželka, Jiří; Dluhoš, L.; Hrušák, D.; Sochová, Jarmila

doi:10.4028/www.scientific.net/msf.584-586.49

Cited by 77 publications

(60 citation statements)

References 8 publications

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“…Reduction in grain size significantly increases the strength and hence extends applications that requires reliable performance. The grain refinement mechanisms of Ti is, however, still unclear due to lack of systematic observations of deformation structures [16][17][18][19][20][21][22][23]. For example, a dynamic recrystallization (DRX) process is suggested to account for the formation of submicrosized grains [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Grain refinement of pure Ti during plastic deformation

Fan

Jiang

et al. 2010

Materials Science and Engineering: A

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a b s t r a c tThe mechanism of grain refinement was studied in titanium subjected to high-rate surface mechanical attrition treatment. By cross-sectional transmission electron microscopy, the deformation structures were systematically characterized in a nanocrystalline (NC) layer of the treated surface which exhibits a grain size gradient. The microstructural evolution with increasing strain involves (1) the formation of slip bands with dislocation-free cells in their interiors, (2) nucleation and migration of high-angle grain boundaries at cell boundaries consisting of high-density tangled dislocations, leading to the formation of submicrosized grains inside the slip bands, followed by (3) the formation of subgrains and dislocation cells inside the submicrosized grains with increasing misorientations, which finally become NC grains. The mechanism of grain refinement was interpreted in terms of the classical migration dynamic recrystallization (DRX) and continuous rotation DRX, respectively, leading to submicrosized and NC grains with increasing strains at high strain rates. The cooperative grain boundary sliding is active at high strain rate, by the presence of arrays of coplanar grain boundaries.

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Section: Introductionmentioning

confidence: 99%

Grain refinement of pure Ti during plastic deformation

Fan

Jiang

et al. 2010

Materials Science and Engineering: A

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“…Valiev et.al. developed implants based on SPD processed CP grade 2 titanium, which apart from increased strength are characterized with improved biological response from osteoblast cells thanks to nanostructured metal surface [10]. Both ECAP and HE are however complex processes requiring multiple steps of deformation to accumulate sufficient strain in processed material.…”

Section: Titanium As a Biomedical Materialsmentioning

confidence: 99%

Microstructure of Commercial Purity Titanium Subjected to Complex Loading by the Kobo Method

Kawałko¹,

Bieda²,

Sztwiertnia³

2016

Archives of Metallurgy and Materials

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mIcrosTrucTure of commercIal purITy TITanIum subjecTed To complex loadIng by The kobo meThodObservations of refined microstructure of Commercial Purity titanium for applications in biomedical devices has been carried out. refinement of titanium microstructure has been performed in process with complex strain scheme. Materials investigated in this work were: Commercial Purity titanium grade 2 and grade 4. Samples of as received materials were subjected to plastic deformation in complex loading process of extrusion combined with oscillation twisting (KoBo extrusion). Both types of samples were deformed in single step of extrusion, in temperature of 450 °C, with extrusion ratio 19.14 and 12.25 for grade 2 titanium and grade 4 titanium, respectively. Initial mean grain diameter for both types of materials was approximately 30 μm. Samples were investigated by means of crystal orientation microscopy. in both cases considerable microstructure refinement has been observed. Microstructures of deformed samples are heterogenous and consist of both elongated and fine equiaxed grains. Elongated grains (lamellae) are separated by High Angle Grain Boundaries and feature internal structure with subgrains and dislocation walls. Grain refinement is stronger in material with higher extrusion ratio and mean grain diameter in this case is equal to 1.48 μm compared to 8.07 μm. in material with lower extrusion ratio.

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“…[1][2][3][4] However, despite the utility of metallic materials of high strength in many implants, cases of implant failure due to metal fatigue and fracture have been reported. [4][5][6] In such an incident, not only the treatment is unsuccessful, but also infection and other severe consequences may prevail, making an urgent surgical intervention inevitable.…”

Section: Introductionmentioning

confidence: 99%

Microstructure-based modeling of the impact response of a biomedical niobium–zirconium alloy

et al. 2014

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This article presents a new multiscale modeling approach proposed to predict the impact response of a biomedical niobium-zirconium alloy by incorporating both geometric and microstructural aspects. Specifically, the roles of both anisotropy and geometry-based distribution of stresses and strains upon loading were successfully taken into account by incorporating a proper multiaxial material flow rule obtained from crystal plasticity simulations into the finite element (FE) analysis. The simulation results demonstrate that the current approach, which defines a hardening rule based on the location-dependent equivalent stresses and strains, yields more reliable results as compared with the classical FE approach, where the hardening rule is based on the experimental uniaxial deformation response of the material. This emphasizes the need for proper coupling of crystal plasticity and FE analysis for the sake of reliable predictions, and the approach presented herein constitutes an efficient guideline for the design process of dental and orthopedic implants that are subject to impact loading in service.

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Nanostructured SPD Processed Titanium for Medical Implants

Cited by 77 publications

References 8 publications

Grain refinement of pure Ti during plastic deformation

Grain refinement of pure Ti during plastic deformation

Microstructure of Commercial Purity Titanium Subjected to Complex Loading by the Kobo Method

Microstructure-based modeling of the impact response of a biomedical niobium–zirconium alloy

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