TY - GEN A1 - Yasenchuk, Yuri A1 - Gunther, Victor A1 - Marchenko, Ekaterina A1 - Chekalkin, Timofey A1 - Baigonakova, Gulsharat A1 - Hodorenko, Valentina A1 - Gunther, Sergey A1 - Kang, Ji-hoon A1 - Weiß, Sabine A1 - Obrosov, Aleksei T1 - Formation of mineral phases in self-propagating high-temperature synthesis (SHS) of porous TiNi alloy T2 - Materials Research Express N2 - The complex structural-phase composition, morphology and elemental composition of surface and nonmetallics in porous TiNi compounds produced by self-propagating high-temperature synthesis (SHS) in a flow reactor in the layer-by-layer combustion mode were analyzed. The samples were investigated using light microscopy (LM), X-ray diffraction (XRD), scanning electron microscopy (SEM), scanning transmission electron microscopy (STEM), and energy dispersive X-ray spectroscopy (EDS). The findings indicate that in addition to the TiNi and Ti2Ni intermetallic constituents, the pore's surface contains numerous Ti4Ni2(O,N,C) nanocrystalline oxycarbonitrides, spinels, polysilicates, and residual amorphous phases. The elemental composition of the surface and crystalline inclusions is investigated by the EDS method. LM, SEM, TEM, and EDS instrumental examination revealed the entire surface comprising a continuous shell of intermetallic superficial bulb-shaped structures, as well as crystalline inclusions of polysilicates and spinels in the intergranular peritectic phase. Prominent morphology was confirmed to appear throughout the pore's surface owing to the interaction of the peritectic liquid (PL) with reaction gases. The epitaxial, nanocrystalline strata of intermetallic oxycarbonitrides were shown to have the intricate nature. Reaction gases chemisorbed by the PL are responsible for the continuous and dense substrate, which ultrafine structure modulates a high corrosion resistance. On the contrary, the sparse and foamy overlay resulted from a convective transfer of the PL by reaction gases facilitates in vivo bio-integration of the alloy. Overall, this sheds light on and may be more indicative of the complex role of superficial strata and nonmetallic crystals in enhanced biocompatibility of the unwrought porous TiNi alloy. KW - Porous TiNi alloys KW - SHS KW - Pore formation KW - Surface structures KW - Reaction gases KW - Amorphous layer Y1 - 2019 UR - https://iopscience.iop.org/article/10.1088/2053-1591/ab01a1 U6 - https://doi.org/10.1088/2053-1591/ab01a1 SN - 2053-1591 VL - 6 IS - 5 ER - TY - GEN A1 - Shtin, Valentin A1 - Novikov, Valeriy A1 - Chekalkin, Timofey A1 - Gunther, Victor A1 - Marchenko, Ekaterina A1 - Choynzonov, Evgeniy A1 - Baik Kang, Seung A1 - Jong Chang, Moon A1 - Hoon Kang, Ji A1 - Obrosov, Aleksei T1 - Repair of Orbital Post-Traumatic Wall Defects by Custom-Made TiNi Mesh Endografts T2 - Journal of Functional Biomaterials N2 - Repairs of orbital post-traumatic and extensive malignant defects remain a major surgical challenge, in view of follow-up outcomes. Incorrect surgical management of injured facial structures results in cosmetic, ophthalmic, and social aftereffects. A custom-made knitted TiNi-based mesh (KTNM) endograft was employed to overcome post-surgical complications and post-resected lesions of the orbital area. Preoperative high-resolution computed tomography (CT) imaging and CAD modelling were used to design the customized KTNM in each case. Twenty-five patients underwent surgery utilizing the suggested technique, from 2014 to 2019. In all documented cases, resolution of the ophthalmic malfunction was noted in the early period. Follow-up observation evidenced no relapsed enophthalmos, hypoglobus, or diplopia as late complications. The findings emanating from our clinical observations allow us to claim that the KTNM indicated a high level of biocompatibility. It is simply modified intraoperatively to attach any desired shape/size for implantation and can also be screw-fixed, providing a good supporting ability. The KTNM precisely renders orbitozygomatic outlines and orbital floor, thus recovering the anatomical structure, and is regarded as an attractive alternative to Ti-based meshes and plates. Additionally, we report one of the studied cases, where good functional and cosmetic outcomes have been achieved. KW - diplopia KW - enophthalmos KW - orbital defect repair KW - TiNi mesh Y1 - 2019 UR - https://www.mdpi.com/2079-4983/10/3/27 U6 - https://doi.org/10.3390/jfb10030027 SN - 2079-4983 VL - 10 IS - 3 ER - TY - GEN A1 - Ryabchikov, Alexander I. A1 - Kashkarov, Egor B. A1 - Shevelev, Alexey A1 - Obrosov, Aleksei A1 - Sivin, D. O. T1 - Surface modification of Al by high-intensity low-energy Ti-ion implantation: Microstructure, mechanical and tribological properties T2 - Surface and Coatings Technology N2 - A high-intensity metal ribbon ion beam was generated using plasma immersion extraction and the acceleration of the metal ions with their subsequent ballistic focusing using a cylindrical grid electrode under a repetitively pulsed bias. To generate the dense metal plasma flow, two water-cooled vacuum arc evaporators with Ti cathodes were used. The ion current density reached 43 mA/cm2 at the arc discharge current of 130 A. High-intensity ion implantation (HIII) with a low ion energy ribbon beam was used for the surface modification of the aluminium. The irradiation fluence was changed from 1.5 × 1020 ion/cm2 to 4 × 1020 ion/cm2 with a corresponding increase in the implantation temperature from 623 to 823 K. The structure and composition of the Ti-implanted aluminium were studied using X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDX). The mechanical properties and wear resistance were measured using nanoindentation and “pin-on-disk” testing, respectively. It was shown that the HIII method can be used to form a deep intermetallic Al3Ti layer. It has been established that a thin (0.4 μm) modified layer with a hcp Ti(Al) structure is only formed on the surface at 623 K, while the formation of the ordered Al3Ti intermetallic phase occurs at the implantation temperatures of 723 and 823 K. Despite the significant ion sputtering of the surface, the thickness of the modified layer increases from ~1 μm to ~6 μm, and the implantation temperature rises from 723 to 823 K. It was found that the homogeneous intermetallic Al3Ti layer with a thickness of up to 5 μm was formed at 823 К. The mechanical and tribological properties of the aluminium were substantially improved after HIII. For the Ti-implanted aluminium, the hardness of the surface layer increases from 0.4 GPa (undoped Al) to 3.5–4 GPa, while the wear resistance increases by more than an order of magnitude. KW - Ion implantation KW - Ribbon ion beam KW - Intermetallics KW - Aluminium KW - Titanium KW - Surface modification Y1 - 2019 UR - https://www.sciencedirect.com/science/article/pii/S0257897219304992?via%3Dihub U6 - https://doi.org/10.1016/j.surfcoat.2019.05.020 SN - 0257-8972 VL - 372 SP - 1 EP - 8 ER - TY - GEN A1 - Fellah, Mamoun A1 - Hezil, Naouel A1 - Djellabi, Ridha A1 - Samad, Mohammed Abdul A1 - Touhami, Mohamed Zine A1 - Montagne, Alex A1 - Iost, Alain A1 - Obrosov, Aleksei A1 - Weiß, Sabine T1 - Rapid and enhanced recovery of poly-dispersed nonionic surfactant (TX-100) from organic mediums using dehydrated and rehydrated kaolin T2 - Applied Clay Science N2 - The recovery of surfactants from organic mediums is of great economic and environmental interests in the field of petrochemicals sector. The aim of this study was to recover poly-dispersed nonionic surfactant (TX-100) from organic medium by the use of dehydrated and rehydrated kaolin. It was found that the presence of water after kaolin rehydration decreases considerably the amount of TX-100 adsorption from 28.7 μmol.g−1 onto dehydrated kaolin to 23.4 μmol.g−1 onto rehydrated kaolin. The estimation of the number of statistical layers of water deposited on kaolin was observed to be about 7 to 9. The effect of type of solvents (heptane, cyclohexane and benzene) on the adsorption onto rehydrated kaolin revealed a reduction in the adsorbed quantity; the adsorbed amounts were found to be 28.7 μmol.g−1, 26.7 μmol.g−1 and 24.2 μmol.g−1 in heptane, cycloheptane and benzene phases, respectively. On the other hand, it was observed that a temperature increased from 20 °C to 35 °C and 45 °C negatively affects the adsorption of TX-100 onto dehydrated and/or hydrated kaolin in heptane medium. KW - Adsorption KW - Organic medium KW - Surfactant recovery KW - Dehydrated/rehydrated kaolin KW - Petrochemical pollution Y1 - 2019 U6 - https://doi.org/10.1016/j.clay.2019.05.004 SN - 0169-1317 VL - 177 SP - 43 EP - 50 ER - TY - GEN A1 - Santhanakrishnan Balakrishnan, Venkateswaran A1 - Obrosov, Aleksei A1 - Kuke, Felix A1 - Seidlitz, Holger A1 - Weiß, Sabine T1 - Influence of metal surface preparation on the flexural strength and impact damage behaviour of thermoplastic FRP reinforced metal laminate made by press forming T2 - Composites Part B: Engineering N2 - In this paper the relationship between surface energy and flexural strength of metal laminate made by reinforcing glass fibre reinforced polymer on steel surfaces was investigated. Sand blasting was performed on 22MnB5 steel surface. This steel was stacked together with layers of unidirectional glass/polyamide-6 prepreg, followed by pressing in a hot press. Influenced parameters are pressure, temperature and time. 3D profilometer analysis was used to investigate the roughness profile on the surface of the steel generated by the sand blasting. The surface energy of the steel surface was calculated from a set of contact angles measured by three different liquids. To identify the optimal surface treatment, the variation of surface energy, flexural strength and roughness of the steel surface was determined as function of the surface treatment. Surface roughness (Ra of 1.08 μm), results indicate that increasing surface roughness leads to improvement in flexural modulus. The increase further leads to decrease in flexural modulus. In addition, the influence of surface energy and flexural strength on the impact damage behaviour was investigated too. The results showed that the sample with highest flexural modulus had the lowest impact-induced damage area. KW - Fiber reinforced plastic (FRP) KW - FRP reinforced metal composite KW - Sand blasting surface treatment KW - Surface energy KW - Contact angle Y1 - 2019 UR - https://www.sciencedirect.com/science/article/pii/S135983681930318X U6 - https://doi.org/10.1016/j.compositesb.2019.05.094 SN - 1359-8368 VL - 173 ER - TY - GEN A1 - Fellah, Mamoun A1 - Hezil, Naouel A1 - Samad, Mohammed Abdul A1 - Montagne, Alex A1 - Kosman, Stephania A1 - Megias, Alberto A1 - Iost, Alain A1 - Obrosov, Aleksei A1 - Weiß, Sabine T1 - Biotribocorrosion behaviour of newly developed nanostructured near β-types Titanium based Alloys for Biomedical Applications T2 - nanoMAT2019 – 2nd International Conference on Nanomaterials and Their Applications N2 - The biotribocorrosion behavior of newly developed nanocristalline near β-types Ti-15Nb and Ti-15Mo alloys surfaces, sintered by powder metallurgy and sequentially milled, has been investigated in SBF simulated body fluid (PBS solution) at OCP, an applied potential in the passive region and EIS. Reciprocating sliding tests using a ball-on-plate tribometer under differentes applied loads 3, 7 and 10 N load and anodic potentials were applied to evaluate the effect of applied lad and the effect of Nb and Mo elements on tribocorrosion behaviors of samples. Results showed that, Ti-Nb exhibited better anticorrosive properties than Ti-Mo. Under tribological action the nanostructured both of alloys showed similar friction coefficient, while Ti-Nb present lower tendency to corrosion compared to Ti-Mo. Furthermore, Nb diffusion increased the repassivation rate with respect to Ti-Mo surfaces due to its stable passive film. Due to the high chemical reaction rate in β-type Ti-15Mo alloy as compared to Ti-15Nb. The β- Ti-15Nb showed lower volume loss, lower friction coefficient values and exhibited better corrosion resistance during tribocorrosion tests than Ti-15Mo. Prevailing electrochemical conditions between -1 and 2 V influences the wear accelerated corrosion by increasing it with the applied potential and slightly increases the mechanical wear. Also, wear accelerated corrosion can be predicted by existing models as a function of electrochemical and mechanical parameters of the titanium alloys. However, considering biomedical applications, the β- Ti15 Mo and Ti15Nb alloys may be good candidates with low elastic modulus and without toxic alloying elements. KW - Biotribocorrosion KW - titanium based alloys KW - Biomedical Applications Y1 - 2019 UR - http://nanomat2019.org/wp-content/uploads/2019/04/Book-of-Abstracts-nanomath2019.pdf SP - 170 ER - TY - GEN A1 - Obrosov, Aleksei A1 - Yasenchuk, Yuri A1 - Marchenko, Ekaterina A1 - Gunther, Victor A1 - Radkevich, Andrey A1 - Kokorev, Oleg A1 - Gunther, Sergey A1 - Baigonakova, Gulsharat A1 - Hodorenko, Valentina A1 - Chekalkin, Timofey A1 - Kang, Ji-hoon A1 - Weiß, Sabine T1 - Biocompatibility and Clinical Application of Porous TiNi Alloys Made by Self-Propagating High-Temperature Synthesis (SHS) T2 - Materials N2 - Porous TiNi alloys fabricated by self-propagating high-temperature synthesis (SHS) are biomaterials designed for medical application in substituting tissue lesions and they were clinically deployed more than 30 years ago. The SHS process, as a very fast and economically justified route of powder metallurgy, has distinctive features which impart special attributes to the resultant implant, facilitating its integration in terms of bio-mechanical/chemical compatibility. On the phenomenological level, the fact of high biocompatibility of porous SHS TiNi (PTN) material in vivo has been recognized and is not in dispute presently, but the rationale is somewhat disputable. The features of the SHS TiNi process led to a multifarious intermetallic Ti4Ni2(O,N,C)-based constituents in the amorphous-nanocrystalline superficial layer which entirely conceals the matrix and enhances the corrosion resistance of the unwrought alloy. In the current article, we briefly explore issues of the high biocompatibility level on which additional studies could be carried out, as well as recent progress and key fields of clinical application, yet allowing innovative solutions. KW - porous SHS TiNi KW - biocompatibility KW - rheological similarity KW - corrosion resistance KW - bone substitution Y1 - 2019 UR - https://www.mdpi.com/1996-1944/12/15/2405/htm#B2-materials-12-02405 U6 - https://doi.org/10.3390/ma12152405 SN - 1996-1944 VL - 12 IS - 15 ER - TY - GEN A1 - Fellah, Mamoun A1 - Hezil, Naouel A1 - Samad, Mohammed Abdul A1 - Djellabi, Ridha A1 - Montagne, Alex A1 - Mejias, Alberto A1 - Kossman, Stephania A1 - Iost, Alain A1 - Purnama, Agung A1 - Obrosov, Aleksei A1 - Weiß, Sabine T1 - Effect of Molybdenum Content on Structural, Mechanical, and Tribological Properties of Hot Isostatically Pressed β-Type Titanium Alloys for Orthopedic Applications T2 - Journal of Materials Engineering and Performance N2 - Aiming to develop alloys with better properties for orthopedic applications, the focus of the present research was to evaluate the effect of Mo at.% content on structural, mechanical, and tribological properties of hot isostatically pressed Ti-xMo (x = 4, 8, 12, 15, and 20 at.%) alloys. The structural evolution, mechanical properties, and tribological behavior of the nanostructured Ti-xMo alloys were evaluated using x-ray diffraction, scanning electron microscope, and ball-on-disk tribometer. Wear tests were conducted under different applied loads of 2, 8, and 16 N. Experimental results indicated that the structural evolution and morphological changes of the milled alloys were sensitive to their molybdenum (Mo) content. The morphological characterization showed that the crystallite size and the particle size decreased with increasing Mo content (at.%) reaching the lowest values of 27 and 26 nm in the case of Ti-15Mo and Ti-20Mo, respectively. On the other hand, the coefficient of friction and wear rates were found to be decreasing with increasing Mo content. KW - friction behavior KW - hot isostatic pressing KW - milling KW - nanobiomaterials KW - Ti-Mo alloy KW - β-type titanium alloy KW - tribology KW - wear resistance Y1 - 2019 UR - https://link.springer.com/article/10.1007/s11665-019-04348-w U6 - https://doi.org/10.1007/s11665-019-04348-w SN - 1059-9495 VL - 28 IS - 10 SP - 5988 EP - 5999 ER - TY - GEN A1 - Obrosov, Aleksei A1 - Kashkarov, Egor B. A1 - Sharma, A. A1 - Weiß, Sabine T1 - Microstructure and defect structure of Zr-1Nb alloy deep surface modified by high Intensity Ti Ion implantation T2 - MC Microscopy Conference, 01-05 September 2019, Berlin, Abstracts N2 - A deep surface modified TiZr layer was fabricated by high-intensity low-energy titanium ion implantation into zirconium alloy Zr-1Nb alloy with the various dose in the range of (5.4–9.56) × 1020 ion/cm2. The gradient distribution of titanium as well as vacancy type defects were analysed. The effects of ion implantation on microstructure, phase composition and elemental distribution of TiZr layer were analysed by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and glow-discharge optical emission spectroscopy, respectively. The results show the appearance of Zr-Ti intermetallic phases of different stoichiometry after Ti implantation. The intermetallic phases are transformed from both Zr0.7Ti0.3 and Zr0.5Ti0.5 to single Zr0.6Ti0.4 phase with the increase in the implantation dose. The depth of Ti penetration into the bulk of Zr increases from 6 to 13 μm with the implantation dose. The higher current density (170 mA/cm2) leads to the increase in the grain size and surface roughness. It was revealed that TiZr layer (~10 μm thickness) is represented by α′ + α(TiZr) lamellar microstructure with gradient distribution of Ti through the layer depth. Transmission electron microscopy was used for investigation of the physical basis of Ti diffusion and its influence on the evolution of the defect structure after surface modification. Furthermore, it was found that on the surface between substrate and implanted layer was found an amorphous layer, which occur as a result of further stress accumulations from the higher implantation doses. Y1 - 2019 UR - https://epub.uni-regensburg.de/40685/1/MC%202019_Proceedings.pdf SP - 86 CY - Berlin ER - TY - GEN A1 - Shevelev, Alexey A1 - Kashkarov, Egor B. A1 - Ryabchikov, Alexander I. A1 - Syrtanov, Maxim S. A1 - Obrosov, Aleksei T1 - Surface Modification of E110 Alloy by High-Intensity Low Ion Energy Cr Implantation T2 - The 21st International Conference on Surface Modification of Materials by Ion Beams, 25-30 August 2019 N2 - The Fukushima disaster has strongly effected on nuclear energetics and their progress [1]. It pointed to a crucial oxidation and subsequent destruction of nuclear fuel claddings in light-water reactors in the case of loss of coolant accident conditions. Surface modification is one of the promising approaches to protect Zr alloys in normal operation and accident conditions of nuclear reactors [2]. Surface modified layers or coatings forming chromia during oxidation is of greatest interest since it meets the basic requirements for accident tolerant fuel materials [3]. The aim of this research is to study the possibility of deep surface modification of zirconium alloy E110 by high intensity ion implantation using low energy metal ion beam. The formation of the metal ion beams is provided by the application of negatively pulsed bias (1.5 kV) to the system immersed in the chromium vacuum arc plasma. The structure and composition of Cr-implanted zirconium alloy were studied by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. The mechanical properties and wear resistance were measured by nanoindentation and «ball on disk» testing, respectively. The influence of implantation temperature on the phase composition, microstructure, and mechanical properties as well as on the corrosion behavior of Cr-implanted zirconium alloy under high-temperature oxidation (up to 1100÷1200 °C) have been described. Y1 - 2019 UR - https://smmib.ru/assets/files/SMMIB2019_TOMSK_full.pdf#page=176 SP - 109 EP - 109 CY - Tomsk ER - TY - GEN A1 - Fellah, Mamoun A1 - Hezil, Naouel A1 - Dekhil, Leila A1 - Samad, Mohammed Abdul A1 - Djellabi, Ridha A1 - Kosman, Stephania A1 - Montagne, Alex A1 - Iost, Alain A1 - Obrosov, Aleksei A1 - Weiß, Sabine T1 - Effect of sintering temperature on structure and tribological properties of nanostructured Ti–15Mo alloy for biomedical applications T2 - Transactions of Nonferrous Metals Society of China N2 - The effect of sintering temperature (1073–1373 K) on the structural and tribological properties of nanostructured ball-milled β-type Ti–15Mo samples was investigated. The prepared samples were characterized using various apperatus such as X-ray diffractometer, scanning electron microscope (SEM) and ball-on-plate type oscillating tribometer. Wear tests were conducted under different applied loads (2, 8 and 16 N). Structural results showed that the mean pore and crystallite size continuously decreased with increasing sintering temperature to reach the lowest values of 4 nm and 29 nm at 1373 K, respectively. The relative density of the sintered sample at 1373 K was as high as 97.0%. Moreover, a higher sintering temperature resulted in higher relative density, greater hardness and elastic modulus of the sample. It was observed that both the friction coefficient and wear rate were lower in the sample sintered at 1373 K which was attributed to the closed porosity. KW - Ti–15Mo KW - wear KW - tribological behaviour KW - nanotribology KW - sintering KW - biomedical applications Y1 - 2019 UR - https://www.sciencedirect.com/science/article/pii/S100363261965137X#! U6 - https://doi.org/10.1016/S1003-6326(19)65137-X SN - 1003-6326 VL - 29 IS - 11 SP - 2310 EP - 2320 ER - TY - GEN A1 - Kashkarov, Egor B. A1 - Ryabchikov, Alexander I. A1 - Syrtanov, Maxim S. A1 - Obrosov, Aleksei A1 - Zacharchenko, S. T1 - ФОРМИРОВАНИЕ ГЛУБОКИХ МОДИФИЦИРОВАННЫХ СЛОЕВ TIZR НА ПОВЕРХНОСТИ ЦИРКОНИЕВОГО СПЛАВА Э110 МЕТОДОМ ВЫСОКОИНТЕНСИВНОЙ ИОННОЙ ИМПЛАНТАЦИИ T2 - 24rd International Conference on Ion-Surface Interactions N2 - This work describes the effect of high-intensity low ion energy implantation on the structure and properties of the surface modified layer forming on zirconium alloy. The influence of irradiation dose on the microstructure, phase composition, thickness and mechanical properties of surface modified zirconium alloy were investigated. T2 - Formation of deep modified TiZr layers on the surface of zirconium E110 alloy using high-intensity ion implantation, 19-23. August 2019 Y1 - 2019 UR - https://elibrary.ru/item.asp?id=41212236 SP - 190 EP - 193 CY - Moscow ER - TY - GEN A1 - Naumov, Anton A1 - Morozova, Iuliia A1 - Rylkov, Evgenii A1 - Obrosov, Aleksei A1 - Isupov, Fedor A1 - Michailov, Vesselin A1 - Rudskoy, Andrey I. T1 - Metallurgical and Mechanical Characterization of High-Speed Friction Stir Welded AA 6082-T6 Aluminum Alloy T2 - Materials N2 - The objective of this study was to investigate the effect of the high welding speed on the mechanical properties and their relations to microstructural characteristics of butt friction stir welded joints with the use of 6082-T6 aluminum alloy. The aluminum sheets of 2.0 mm thick were friction stir welded at low (conventional FSW) and high welding speeds (HSFSW) of 200 and 2500 mm/min, respectively. The grain size in the nugget zone (NZ) was decreased; the width of the softened region was narrowed down as well as the lowest microhardness value located in the heat-affected zone (HAZ) was enhanced by HSFSW. The increasing welding speed resulted in the higher ultimate tensile strength and lower elongation, but it had a slight influence on the yield strength. The differences in mechanical properties were explained by analysis of microstructural changes and tensile fracture surfaces of the welded joints, supported by the results of the numerical simulation of the temperature distribution and material flow. The fracture of the conventional FSW joint occurred in the HAZ, the weakest weld region, while all HSFSW joints raptured in the NZ. This demonstrated that both structural characteristics and microhardness distribution influenced the actual fracture locations. KW - high-speed friction stir welding (HSFSW) KW - aluminum alloy KW - remnant oxide line (ROL) KW - microstructural characteristics KW - mechanical properties KW - fracture behavior KW - FEM Y1 - 2019 UR - https://www.mdpi.com/1996-1944/12/24/4211 U6 - https://doi.org/10.3390/ma12244211 SN - 1996-1944 VL - 12 IS - 24 ER - TY - GEN A1 - Fellah, Mamoun A1 - Hezil, Naouel A1 - Dekhil, Leila A1 - Samad, Mohammed Abdul A1 - Montagne, Alex A1 - Mejias, Alberto A1 - Iost, Alain A1 - Obrosov, Aleksei A1 - Weiß, Sabine T1 - Structural characterization of developed near β-Type Titanium Alloys (Ti-25NbxZr) for biomedical Applications T2 - 3rd International Conference on Mechanics and Materials : ICMM’2019 11-12 November 2019. Setif, Algeria, Abstracts book N2 - The osteoarthritis and degenerative diseases osteoporosis as well as trauma lead to the bone mechanical properties degradation due to absence of normal biological self healing processes or excessive loading [1–5]. These problems solution are artificial biomaterials, as surgical implantation of appropriate shapes helps restore function for the otherwise functionally compromised structures [1–5]. Biocompatibility is considered to be optimal once tissue neoformation and later function occurs around implantable devices [6]. The efficacy of biomaterials implants is determined mostly by their surface characteristics such as microstructure, surface morphology, composition and biological properties [2]. Aiming to develop alloys with better properties for orthopedic applications, the focus of the present research was to evaluate the effect of Zr at. % content on structural, mechanical and tribological properties of hot isostatically pressed Ti-25Nb-xZr (x = 5, 10, 15, 20 and 25 at. %) alloys. The structural evolution, and mechanical properties of the nanostructured Ti-Nb-xZr alloys were evaluated using X-Ray diffraction, scanning electron microscope. The mechanical properties were performed using Vickers hardness and berkovich nanoindentation. Experimental results indicated that the structural evolution and morphological changes of the milled alloys were sensitive to their Zirconium (at. %) content. The morphological characterization showed that the crystallite size and the particle size decreased with increasing Zr content (at. %). As well, as the Zr was added to the Ti-25NbXZr system, there was a clear decrease in the Vickers hardness and young’s modulus. On the other hand, the coefficient of friction and wear rates were found to be decreasing with increasing Zr content. KW - Ti-Nb-Zr alloys KW - Nanobiomaterials KW - tribological behaviour KW - Sintering KW - Biomedical applications Y1 - 2019 UR - https://drive.google.com/file/d/1XCFz_8p3aAacxwT1bWgK_rljAL5_oEXS/view SP - 224 EP - 225 CY - Setif, Algeria ER - TY - GEN A1 - Khalil, S. A1 - Fellah, Mamoun A1 - Hezil, Naouel A1 - Smata, L. A1 - Montagne, Alex A1 - Mejias, Alberto A1 - Kossman, Stephania A1 - Iost, Alain A1 - Obrosov, Aleksei A1 - Weiß, Sabine T1 - Synthèse et caractérisation structurale d’un composé nanostructuré de Ti, Mo et Zr pour applications biomédicales T2 - 3rd International Conference on Mechanics and Materials : ICMM’2019 11-12 November 2019. Setif, Algeria, Abstracts book N2 - Le milieu médical est un perpétuel demandeur de biomatériaux compatibles surtout en orthopédie. Effectivement le nombre important d’arthroplasties effectuées chaque année ne cesse d’augmenter dans le monde, non seulement du fait vieillissement de la population (à partir de 65 ans), mais aussi de demandes de patients plus jeunes entre 45 ans et 55 ans. Actuellement, les composés à base de titane Ti sont largement utilisés comme des biomatériaux pour leur biocompatibilité, leur résistance à la corrosion et leur faible module d’élasticité. Le molybdène et le zirconium sont parmi les meilleurs éléments alliés parce qu’ils sont non toxiques et non allergiques et offrent d’excellentes propriétés. De plus,Le Zr peut augmenter la trempabilité et la résistance à la corrosion de l'alliage . Mo est un élément fort stabilisant pour la phase des alliages de titane et les alliages à base de Ti-Mo présentent des propriétés mécaniques adéquates compatibilité et bonne cyto-compatibilité . Par conséquent, le système Ti-Mo-Zr, qui a montré une bonnes performances et de magnifiques perspectives dans l’application de biomatériaux, a été intensivementétudié [1,2,3]. Cependant, les alliages de Ti largement utilisés, tels que les interstitiels extra-low (ELI) Ti-6Al-4V (wt.% en poids ), Ti- 5Al-2,5 Fe et Ti-6Al-7Nb, ont le risque de libérer de l'aluminium toxique (Al) et les Ions de vanadium (V) in vivo, ce qui peut causer des problèmes de santé, comme la maladie d’Alzheimer et la neuropathie[4].La métallurgie des poudres (MP), y compris la méthode de mixture des composants en poudre, qui consiste à fritter titane en poudre ou ses mélanges avec d’autres composants en poudre, est un procédé économique à moindre cout. La nanotechnologie est intervenue dans la structuration des biomatériaux à l’échelle nanométrique (entre1nmet 100 nm) par soucis d’amélioration des propriétés mécanique surtout le module de Young. KW - Biomatériaux, KW - Ti-Mo-Zr KW - nanomatériaux KW - caractérisation structurale KW - broyage mécanique Y1 - 2019 UR - https://drive.google.com/file/d/1XCFz_8p3aAacxwT1bWgK_rljAL5_oEXS/view SP - 243 EP - 244 CY - Setif, Algeria ER - TY - GEN A1 - Marchenko, Ekaterina A1 - Yasenchuk, Yuri A1 - Gunther, Sergey A1 - Baigonakova, Gulsharat A1 - Gunther, Victor A1 - Chekalkin, Timofey A1 - Weiß, Sabine A1 - Obrosov, Aleksei A1 - Dubovikov, Kirill T1 - Structural-phase surface composition of porous TiNi produced by SHS T2 - Materials Research Express N2 - The study aimed to characterize the structural-phase composition of the porous SHS TiNi surface explored by the GIXRD method. The surface layers at a depth of up to 100 nm mainly consist of amorphous nanocrystalline intermetallic oxycarbonitrides Ti₄Ni₂(O,N,C) with nonmetallic inclusions of different structural variants and routes of origin. Fine-porous alloys were synthesized at ignition temperatures of 450-480 °C. A distinct feature of the surface of crystalline phases therein was shown to be a low degree of crystallinity (up to 40%) and presence of multifarious glass and cermet phases evident as NiSi₂, NaAlSiO (SO₄), SiO₂, MgSi₂, and CaCO₃. Conversely, large-pore alloys ignited at temperatures of 280-330 °C have a higher degree of crystallinity (up to 70%). An individually selected GIXRD technique and precision structural phase analysis are capable to determine a set of other superficial nonmetallic and cermet phases reported as CaTiO₃, Si (P2O₇), CaSiO₃, MgAl₂O₄, TiNiAl, as well as the Ti₃SiC₂MAX phase. Y1 - 2019 UR - https://iopscience.iop.org/article/10.1088/2053-1591/ab4e32/pdf U6 - https://doi.org/10.1088/2053-1591/ab4e32 SN - 2053-1591 VL - 6 IS - 11 ER -