TY - GEN A1 - Fellah, Mamoun A1 - Hezil, Naouel A1 - Bouras, Dikra A1 - Bouchareb, Nabila A1 - Larios, Alejandro Perez A1 - Obrosov, Aleksei A1 - El-Hiti, Gamal A. A1 - Weiß, Sabine T1 - Investigating the effect of Zr content on electrochemical and tribological properties of newly developed near β-type Ti-alloys (Ti–25Nb-xZr) for biomedical applications T2 - Journal of Science: Advanced Materials and Devices N2 - In order to create alloys with exceptional properties for orthopedic uses, this study focuses on the impact of zirconium (Zr) content on the structural, electrochemical, and tribological qualities of nanostructured Ti–25Nb-xZr [x = 5, 10, 15, 20, 25, and 30 atomic (at.) %] alloys. The structural evolution was investigated using XRD and SEM techniques. The mechanical characteristics of the produced alloys, including Vickers hardness and Young's modulus, were measured. In addition, the corrosion tests were performed using the OCP, EIS, and PD methods in Ringer's solution within the independent pH range at 37 °C. A ball-on-disc tribometer was used to investigate the tribological behavior of the alloys under various loads and wet conditions using the Ringer solution. It has been verified that Zr content (at. %) in the alloys had an impact on their morphologies, structural evolution, and mechanical characteristics. According to the morphological analysis, the particle and crystallite size decreases with increasing Zr content. Young's modulus and Vickers hardness show the same tendency. The EIS data demonstrated that a single passive film formed on the alloy surfaces, and the addition of Zr enhanced the corrosion resistance of the passive films. The polarization curves demonstrate that the alloys had low corrosion current densities and large passive areas without the passive films disintegrating. Likewise, the inclusion of Zr resulted in a reduction in the corrosion and passive current densities values. All of these results suggested that the titanium alloys exhibit a more noble electrochemical activity caused by Zr. From the tribological perspective, it was found that the friction coefficient of the alloys reduced with increasing Zr content. KW - Ti-Nb-Zr alloys KW - Nanobiomaterials KW - Tribological behavior KW - Corrosion KW - Ringer's solution KW - Biomedical applications Y1 - 2024 UR - https://www.sciencedirect.com/science/article/pii/S2468217924000261 U6 - https://doi.org/10.1016/j.jsamd.2024.100695 SN - 2468-2179 ER - TY - GEN A1 - Fellah, Mamoun A1 - Bouchareb, Nabila A1 - Hezil, Naouel A1 - Merah, Neçar A1 - Alashkar, Yasser A1 - Imran, Mohd A1 - Obrosov, Aleksei A1 - Weiß, Sabine T1 - Electrochemical analysis of mechanically alloyed Ti50%-Ni50% alloy for bone implants use T2 - Journal of Alloys and Compounds N2 - The corrosion resistance of an implant material is an essential element of its biocompatibility. This research focuses on studying the effect of grinding/milling time on the corrosion behavior of the mechanically alloyed Ti50 %-Ni50 % (at%) alloy, for bone implant use, at varying milling times of 2, 6, 12, and 18 h. The powder particles' size, shape, and homogeneous chemical content were examined employing scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The alloyed particles' structural characteristics were determined by X-ray diffraction (XRD). Moreover, the characterization of the electrochemical properties was performed utilizing open-circuit potential (OCP) measurement, the Potentiodynamic Polarization (PD), and the Electrochemical Impedance Spectroscopy (EIS) technique. Electrochemical tests were conducted in physiological mediums simulating the human body: Hank's solution. The results revealed that; as the grinding time increased the crystallite size reduced from 57 nm to 29 nm, whereas the lattice parameters increased slightly from 3.18 to 3.22 Å, while the microstrain increased from 0.32 % to 0.99 %. Moreover, the hardness and Young's Modulus increased by about 70 and 16 %, respectively with milling period going from 2 to 18 h. The findings of the electrochemical test demonstrated that as milling progressed, corrosion resistance increased. The evolution of OCP curves as a function of the duration of immersions indicated that OCP increased with the duration of immersion up to 2500 s; this is due to a stable passive layer that has formed on the samples' surface. The results of potentiodynamic polarization curves revealed that both corrosion current density (icorr) and corrosion rate (CR) decreased reaching a value of 3.6945E-07 A/cm2 and 0.0074722 mm/year, respectively, at longer milling time (18 h). While, corrosion potential (Ecorr) increased from −0.51255 V/SCE to −0.29997 V/SCE with increasing grinding time. Additionally, the EIS data indicated that the resistance of the passive film increased with increasing milling times. The samples of Ti50-Ni50 produced at longer milling time exhibited excellent corrosion resistance due to the formation of a stable passive film which makes them useful for bone implants. KW - Ti-Ni alloys KW - Biomaterials KW - Mechanical alloying KW - Nanomaterial KW - Corrosion behavior KW - Electrochemical impedance spectroscopy Y1 - 2025 U6 - https://doi.org/https://doi.org/10.1016/j.jallcom.2024.178046 SN - 1873-4669 IS - 1010 SP - 1 EP - 13 ER - TY - GEN A1 - Alontseva, Darya A1 - Safarova (Yantsen), Yuliya A1 - Voinarovych, Sergii A1 - Obrosov, Aleksei A1 - Yamanoglu, Ridvan A1 - Khoshnaw, Fuad A1 - Nessipbekova, Assem A1 - Syzdykova, Aizhan A1 - Yavuz, Hasan Ismail A1 - Kaliuzhnyi, Sergii A1 - Krasavin, Alexander A1 - Azamatov, Bagdat A1 - Khozhanov, Alexandr A1 - Olzhayev, Farkhad A1 - Weiß, Sabine T1 - Microplasma-Sprayed Titanium and Hydroxyapatite Coatings on Ti6Al4V Alloy: in vitro Biocompatibility and Corrosion Resistance: Part I T2 - Johnson Matthey Technology Review N2 - This two-part paper investigates the bioactivity and mechanical properties of coatings applied to Ti6Al4V, a common titanium alloy used in endoprosthetic implants. Coatings made from hydroxyapatite (HA) powder and commercially pure titanium (CP-Ti) wires were applied using microplasma spraying. The study focuses on the responses of rat mesenchymal stem cells (MSCs), which are essential for bone healing, to these coatings. Part I shows how adjusting the microplasma spraying process allows coatings with varying porosity and surface roughness to be achieved. KW - Endoprosthesis implants KW - Biocompatible coatings KW - Porosity KW - Surface roughness KW - In vitro test KW - Elastic modulus Y1 - 2025 UR - https://technology.matthey.com/content/journals/10.1595/205651325X17201903387613 U6 - https://doi.org/10.1595/205651325X17201903387613 VL - 69 IS - 1 SP - 45 EP - 58 ER - TY - GEN A1 - Alontseva, Darya A1 - Safarova (Yantsen), Yuliya A1 - Voinarovych, Sergii A1 - Obrosov, Aleksei A1 - Yamanoglu, Ridvan A1 - Khoshnaw, Fuad A1 - Nessipbekova, Assem A1 - Syzdykova, Aizhan A1 - Yavuz, Hasan Ismail A1 - Kaliuzhnyi, Sergii A1 - Krasavin, Alexander A1 - Azamatov, Bagdat A1 - Khozhanov, Alexandr A1 - Olzhayev, Farkhad A1 - Weiß, Sabine T1 - Microplasma-sprayed titanium and hydroxyapatite coatings on Ti6Al4V alloy: in vitro biocompatibility and corrosion resistance : part II coatings enhance cell proliferation, corrosion resistance and implant integration T2 - Johnson Matthey Technology Review N2 - Part II presents the results which show that HA coatings significantly enhance MSC proliferation by 13% compared to the titanium alloy base, while titanium coatings also exhibit an 11% increase. Porosity inversely affects CP-Ti’s elasticity. Coatings with lower porosity demonstrate better corrosion resistance. HA coatings promote osteogenic activity and angiogenesis, which is crucial for implant integration. KW - Endoprosthesis implants KW - Biocompatible coatings KW - Porosity KW - Surface roughness KW - In vitro test KW - Elastic modulus Y1 - 2025 U6 - https://doi.org/10.1595/205651325X17290035905758 SN - 2056-5135 VL - 69 (2025) IS - 1 SP - 59 EP - 75 ER - TY - GEN A1 - Rim, Imen A1 - Hezil, Naouel A1 - Fellah, Mamoun A1 - Saoudi, Adel A1 - Obrosov, Aleksei A1 - El-Hiti, Gamal A. T1 - Enhancing kaolin performance through organic molecule modification and assessing its efficiency for lead and copper adsorption T2 - Environmental Technology & Innovation N2 - The research aimed to enhance the efficacy of kaolin in water treatment by incorporating diphenylamine (DPA) and to evaluate its effectiveness in adsorbing lead and copper in wastewater in comparison to natural kaolin (Nat-kaolin). This entailed modifying kaolin with DPA to create DPA-kaolin and conducting comprehensive characterization utilizing a range of techniques, including X-ray diffraction analysis (XRD), scanning electron microscope (SEM), energy dispersion X-ray (EDX), thermogravimetric analysis (TGA), differential thermal analysis (DTA), Fourier-transform infrared spectroscopy (FTIR), and Brunauer-Emmett-Teller (BET) analysis. The results demonstrated the successful modification of DPA, as evidenced by an increase in BET-specific surface area of about 25 % (from 66.69 m².g−1 to 71.35 m².g−1), indicating enhanced adsorption capacity. XRD analysis confirmed the composition of the samples, while TGA/DTA indicated changes in water adsorption and dehydroxylation. SEM and EDX illustrated the tubular nature of the clay with a decrease in the amount of Al, about 10.76 %, and the amount of Si, about 10.38 %, on the DPA-kaolin. Notably, the FTIR spectrum of DPA-kaolin showed the presence of new vibration bands at 1248 cm−1, indicating the presence of DPA. In terms of adsorption, the DPA-kaolin exhibited significantly higher maximum adsorption capacities for Pb(II) and Cu(II) compared to the nat-kaolin, with values of 151 µmol/g and 134 µmol/g, respectively.These values were significantly higher than those observed for Nat-kaolin, which demonstrated adsorption capacities of 103 µmol/g for Pb(II) and 91 µmol/g for Cu(II). The adsorption kinetics indicated that the pseudo-second-order kinetic model described the sorption mechanism for both Pb(II) and Cu(II). This was evidenced by the values of R², which were 0.999 and 0.996, respectively. The study provides clear evidence that DPA-kaolin is more effective than Nat-kaolin in removing lead (Pb(II)) and copper (Cu(II)) from wastewater. Through rigorous experimentation, it was observed that DPA-kaolin exhibited notably enhanced adsorption capabilities for both Pb(II) and Cu(II) compared to Nat-kaolin. These findings serve to emphasize the practical importance and potential utility of the modification, offering promising prospects for the development of more efficient wastewater treatment methodologies. KW - Kaolin clay KW - Water treatment KW - DPA-Kaolin KW - Chemical treatment KW - Adsorption KW - Isotherms Y1 - 2024 U6 - https://doi.org/10.1016/j.eti.2024.103904 SN - 2352-1864 VL - 36 IS - November 22024 SP - 1 EP - 19 ER - TY - GEN A1 - Bouras, Dikra A1 - Fellah, Mamoun A1 - Barille, Regis A1 - Obrosov, Aleksei A1 - Ikbal, Amjad A1 - Avramov, Pavel V. A1 - El-Hiti, Gamal A. T1 - Multiple layers, porous surface, and their role in increasing the efficiency of photocatalytic coating on (DD3, DD3+ZrO2) ceramics and glass T2 - Ceramics International N2 - Magnesium-doped zinc oxide thin films were dip-coated onto porous ceramic and glass substrates under identical conditions (50 layers, same doping ratio). Structural, morphological, and photocatalytic properties were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), UV–visible spectrophotometry, and confocal microscopy. XRD analysis indicated a shift in peak positions towards higher angles, increased grain size, and lattice distortion on both substrates. Unique flower-shaped crystalline granulates were observed exclusively on the ceramic substrate (DD3Z). The energy gap decreased on the ceramic and increased on the glass substrate. The photocatalytic activity was evaluated using an aqueous orange II solution, showing significantly higher decomposition (80 ± 0.53 % after 6 h) on the ceramic compared to the glass substrate (30 %). The enhanced performance on ceramic substrates, particularly with DD3+ZrO2, was attributed to increased microporosity, surface roughness, and active material incorporation, facilitating greater photocatalytic efficiency. The findings suggest promising applications of these materials for efficient and cost-effective photocatalysis, with potential for reuse after thermal treatment at 500 °C. KW - Magnesium oxide KW - Magnesium-doped zinc oxide/DD3+zirconium oxide KW - Magnesium-doped zinc oxide/glass KW - Degradation capacity KW - Nanotechnology KW - Nanocomposites Y1 - 2024 U6 - https://doi.org/https://doi.org/10.1016/j.ceramint.2024.08.239 SN - 1873-3956 VL - 50 IS - 21, C SP - 43854 EP - 43873 ER - TY - GEN A1 - Fellah, Mamoun A1 - Hezil, Naouel A1 - Bouras, Dikra A1 - Habeeb, Majeed Ali A1 - Hamadi, Fouzia A1 - Bouchareb, Nabila A1 - Laouini, Salah Eddine A1 - Larios, Alejandro Perez A1 - Obrosov, Aleksei A1 - El-Hiti, Gamal A. T1 - Microstructural and photocatalytic properties of nanostructured near-β Ti-Nb-Zr alloy for total hip prosthesis use T2 - Kuwait Journal of Science N2 - With its unique corrosion resistance, light weight, mechanical strength, and biocompatibility, TNZ is a versatile metal alloy that is used in the aerospace and medical industries. The current study aims to investigate the effect of milling time (2, 12, 24, and 36 h) on the nanostructured ternary alloy Ti-25Nb-25Zr (TNZ) prepared by high energy ball milling, a process involving the use of a high-energy ball mill to mix and grind the alloy powders, on its structural, physical, and photocatalytic characterizations. The alloys' characteristics, such as morphology, structural properties, relative density/porosity, surface roughness, hardness, and Young's modulus, were evaluated using SEM, XRD, surface profilometer, and microdurometer, respectively. The photocatalytic characterization was conducted by measuring their absorbance as a function of time using a spectrophotometer of visible and ultraviolet light in the wavelength range of 250–650 nm. Results showed that the crystallite and mean pore size reduced with increasing milling time, with the smallest values of 25 nm and 34 μm, respectively, after 36 h. This indicates that longer milling times result in a more compact and uniform structure, which could enhance the mechanical properties of the alloy. Structural characterization shows that the amount of the β-Ti phase increased with increasing milling time, resulting in the spherical morphology and texturing of the synthesized alloys. The milled alloys' structural evolution and morphological changes were sensitive to their milling times. Also, the relative density, Young's modulus, and hardness increased, reaching values of 89 %, 105 GPa, and 352 HV, respectively, due to grain size decreasing with increasing milling time. This suggests that longer milling times lead to a denser and harder alloy, which could be beneficial for its use in total hip prostheses. The photocatalytical characterization demonstrated that the degradation of orange II (OII) increased with increasing milling time. The Ti-25Nb-25Zr catalyst gave the best degree of degradation, which meant that the decolorization process could be operated rapidly and at a relatively low cost without UV irradiation. KW - Ti-25Nb-25Zr alloy KW - Biomaterial alloys KW - Total hip replacement KW - Photocatalytic KW - Biocompatibility KW - Artificial bone KW - Orthopedic implants Y1 - 2024 U6 - https://doi.org/https://doi.org/10.1016/j.kjs.2024.100276 SN - 2307-4116 VL - 51 IS - 4 SP - 1 EP - 12 PB - Elsevier ER - TY - GEN A1 - Bouras, Dikra A1 - Fellah, Mamoun A1 - Barille, Regis A1 - Obrosov, Aleksei A1 - El-Hiti, Gamal A. T1 - Production of novel Zr–Mg nanoceramics based on kaolinite clay with strong antibacterial activity T2 - Ceramics International N2 - Gram-negative bacteria Pseudomonas putida, Gram-positive Bacillus subtilis, and Staphylococcus aureus were utilized as test samples to evaluate the antibacterial characteristics of DD3-clay/MgO and DD3+38 wt% ZrO2-clay/MgO nanoparticles. The ceramic powders prepared by a thermal autoclave method are characterized before and after Mg addition by SEM, EDX, XRD, IR, UV–visible, and TEM in order to investigate microstructure, phase, and surface morphology. The results showed that after adding Mg, it led to the deformation of the crystal lattices of (mullite, zirconium silicate, and zirconium oxide) together with a decrease in particle size (75–103 nm) and a complete change in its shape from nanotube to nanospherical, as observed by SEM and TEM analyses. It also confirmed by UV–visible spectroscopy that the addition of Mg increases the absorbance accompanying a decrease in the energy gap of 1.91, 1.74, 1.73, and 1.43 eV corresponding to DD3, DD3Z, DD3/30 wt% Mg and DD3Z/30 wt% Mg respectively. The antibacterial mechanism is related to the size of the particles, the solvent used for powder dissolution, the nanoparticle's size when they come into touch with bacteria, and the generation of reactive oxygen species (ROS: ˙O2−, ˙OH, and H2O2). It was observed that the anti-bacterial activity is enhanced with 10 wt% and 30 wt% of Mg added to a modified ceramic powder. Also, more O2− is formed on the surface of the prepared powder, which penetrates the bacterial cell and destroys it. The nanocomposite particles showed remarkable antibacterial activity when they were dissolved in DMSO compared to methanol and chloroform as organic solvents. The aim is to enrich knowledge on the antibacterial activities of metal nanoparticles (ZrSiO4 and MgO) on three bacterial strains with different Grams due to their extensive involvement in the phenomena of contamination and infection encountered in the medical field. The synthesized nanoparticles have good antimicrobial activity against all strains tested. A maximum inhibition zone of 35 ± 0.2 mm was obtained with S. aureus, a zone of 23 ± 0.46 mm with P. putida and a zone of 27 ± 0.46 nm with B. subtilis for DD3/30 wt% Mg and an inhibition zone of 38 ± 0.93 mm, 26 ± 0.24 nm and 17 ± 0.33 nm was obtained with same strains for DD3Z/30 wt% Mg, respectively. KW - DD3 + 38 wt% ZrO2/Mg KW - Nanoparticles KW - Synthesis KW - Antibacterial activity KW - Transmission electron microscope KW - Nanomaterial Y1 - 2024 U6 - https://doi.org/https://doi.org/10.1016/j.ceramint.2024.05.091 SN - 1873-3956 VL - 50 IS - 16 SP - 27949 EP - 27960 PB - Elsevier ER - TY - GEN A1 - Sellam, Manel A1 - Azizi, Soulef A1 - Bouras, Dikra A1 - Fellah, Mamoun A1 - Obrosov, Aleksei A1 - El-Hiti, Gamal A. T1 - Degradation of rhodamine B dye under visible and solar light on zinc oxide and nickel-doped zinc oxide thin films T2 - Optical Materials N2 - The kinetic investigation of rhodamine B dye's photocatalytic degradation, chosen as a model pollutant, was conducted at room temperature using Zinc oxide (ZnO) and nickel-doped zinc oxide (Zn0.97Ni0.03O) photocatalysts synthesized through the spray pyrolysis method. XRD analysis confirmed the formation of hexagonal ZnO and Zn0.97Ni0.03O films, with crystallite sizes ranging from 19 to 29 nm and varying in mean average grain size from 72 nm to 88 nm. The surface morphology of the Ni-doped ZnO films was influenced by nickel doping, observed through SEM and TEM micrographs, revealing a dense structure of spherical-shaped crystals. Light transmission and optical band gap energy of the films ranged between specified values, ranging from 3.27 to 3.24 eV. The degradation process was assessed under various conditions, including different light sources (UV lamp and solar irradiation), pH levels, and substrate concentrations. Degradation followed a pseudo-first-order kinetic model, with rate constants (k) and half-life times (t1/2) calculated accordingly. The degradation efficiency of undoped ZnO and ZnO doped with nickel decreased with increasing concentration under UV irradiation from (0.1–0.5 M) under UV irradiation decreased from (34.29–45.02) (49.61–56.61), while under visible light are (40–45.07 %) (58.46–60.24 %), removal rates ranged within specific percentages. The porous Zn0.97Ni0.03O synthesized at 0.5 M exhibited the highest photocatalytic efficiency due to its enhanced crystallinity, resulting in degradation rates of 9.22 and 11.22 × 10−3 min−1 and half-life times of 75.18 and 61.77 min at 90 min specified for both UV and solar light irradiations, respectively. Acidification of the reaction medium accelerated the photocatalytic degradation kinetics, while alkalization slowed it down. These findings mark a significant advancement in the utilization of oxide semiconductors for water pollutant degradation under natural sunlight. KW - Zn0.97Ni0.01O KW - Rhodamine B KW - Heterogeneous photocatalysis KW - Solar irradiation Y1 - 2024 U6 - https://doi.org/https://doi.org/10.1016/j.optmat.2024.115316 SN - 1873-1252 VL - 151 (2024) SP - 1 EP - 17 PB - Elsevier ER - TY - GEN A1 - Bouchareb, Nabila A1 - Fellah, Mamoun A1 - Hezil, Naouel A1 - Hamadi, Fouzia A1 - Montagne, Alex A1 - Obrosov, Aleksei A1 - Yadav, Krishna Kumar A1 - El-Hiti, Gamal A. T1 - Effect of milling time on structural, physical and photocatalytical properties of Ti-Ni alloy for biomedical applications T2 - The International Journal of Advanced Manufacturing Technology N2 - Ti-Ni shape memory alloys (SMA) are used extensively in the field of orthopedics owing to their unique physical and mechanical features, excellent corrosion resistance, and good biocompatibility in the human body environment. This study aims to investigate how milling time affects the characteristics of Ti-Ni alloys which were synthesized with equal atomic percentages by using a high-energy ball milling type (Planetary Micro Mill Pulverisette P7, Fritsch GmbH, Germany) under varying milling periods (2, 6, 12, and 18 h). The duration of the grinding process refines the grain and diminishes the material's porosity, improving the material's physical and structural characteristics as well as its photocatalytic activity. The milled powders of Ti50-Ni50 alloys underwent characterization employing scanning electron microscopy (SEM) associated with an energy dispersive spectrometer (EDS), X-ray diffraction (XRD), and spectrophotometery of visible and ultraviolet light (UV–VIS) to measure the solution absorbance of methylene blue (MB). The results revealed that the milling process influences the particle size and shape of powders, where the proportion of fine particles increased with increasing grinding times from 2 to 18 h due to severe deformation and fracturing. The crystallite size was reduced, and the microstrain increased, attaining values of 29 nm and 0.99%, respectively. In addition, the pores of samples were decreased to 10 nm at higher milling times. Furthermore, solutions of MB containing powders of Ti50-Ni50 milled at 18 h exhibited good photocatalytic activity with a degradation rate value of 93.23% after 60 min of irradiation time because of a greater surface area. The improved properties of Ti50-Ni50 alloys make them clinically useful for biomedical implantation in humans. Plus, they are considered to be effective materials for photocatalytic applications. KW - Ti-Ni shape memory alloys KW - Milling time KW - Structural evaluation KW - Nanostructure KW - Biomedical implant KW - Photocatalytic activity Y1 - 2024 U6 - https://doi.org/https://doi.org/10.1007/s00170-024-13207-5 SN - 1433-3015 VL - 131 (2024) SP - 3539 EP - 3553 PB - Springer ER - TY - GEN A1 - Belgroune, Ahlam A1 - Aissani, Linda A1 - Alhussein, Akram A1 - Zaabat, Mourad A1 - Obrosov, Aleksei A1 - Rtimi, Sami T1 - In Vitro Corrosion and Wear Investigation of Multifunctional TiAlMoN Sputtered Coatings on Cold-Sprayed SS316L T2 - ACS Applied Engineering Materials N2 - Although TiAlN has been thoroughly studied, there is still an ongoing demand for developing new-based TiAlN films with enhanced protection efficiency for a long lifetime and high load-bearing capability linked to friction and corrosion mechanisms. This work aims to present the effect of Mo content by studying the structural tribo-mechanical, wettability, and corrosion behaviors in TiAlMoN coatings deposited by magnetron sputtering on cold-sprayed stainless steel 316L substrates. TiAlMoN coatings showed a dense columnar structure with the coexistence of titanium and molybdenum nitrides, and TiN (200) preferred orientation changed to TiN(111) with increasing Mo content. The surface energy of the TiAlMoN coatings decreased gradually with the increase in Mo content. The TiAlMoN coating containing 16.09 atom % Mo possesses the highest hardness and Young’s modulus (29.5 and 334.5 GPa, respectively) and the maximum H/E and H3/E2 of 0.092 and 0.237, respectively. Formations of tribolayer oxides reduced the friction and enhanced the wear resistance of TiAlMoN coatings in atmospheric conditions and reached the minimum values of 0.3 and 0.849 × 10–6 mm3/N, respectively, at 16.09 atom % of Mo under 5 N load charge. Corrosion examination in simulated seawater revealed that TiAlMoN coating-coated SS316L exhibited a significant positive shift of about −16 mV in corrosion potential with a notable reduction in corrosion current density (1.41 nA/cm2), confirming the improved corrosion performance. The combination of both cold spray and magnetron sputtering techniques for producing this kind of component is shown to have great potential in processing applications. KW - Magnetron sputtering KW - Cold spray KW - TiAlMoN coating KW - Wettability KW - Tribo-mechanical properties KW - Corrosion resistance Y1 - 2024 UR - https://pubs.acs.org/doi/10.1021/acsaenm.3c00672 U6 - https://doi.org/https://doi.org/10.1021/acsaenm.3c00672 SN - 2771-9545 VL - 2 IS - 2 SP - 345 EP - 359 ER - TY - GEN A1 - Fellah, Mamoun A1 - Hezil, Naouel A1 - Bouras, Dikra A1 - Obrosov, Aleksei A1 - Samad, Mohammed Abdul A1 - Montagne, Alex A1 - Abd-Elmonem, Assmaa A1 - Din, Sayed M El A1 - Weiß, Sabine T1 - Structural, mechanical and tribological performance of a nano structured biomaterial Co–Cr–Mo alloy synthesized via mechanical alloying T2 - Journal of Materials Research and Technology N2 - The influence of milling time on the tribological behavior of a Co–Cr–Mo alloy designed for biomedical applications, synthesized via mechanical alloying is investigated. Elemental Co, Cr and Mo powders are milled using different milling times (2, 6, 12 and 18 h) in a high-energy ball mill. The resulting powders were subjected to cold uniaxial and hot isostatic pressing respectively, followed by sintering to obtain cylindrical samples, which were evaluated for their structural, mechanical and the wear behavior. Results showed that the grain and crystallite sizes of the powders decreased with increasing milling time, reaching low values of <10 μm and 32 μm respectively, at higher milling times. Furthermore, the wear rates and the coefficients of friction were lower, at higher milling times due to high densities (96%), and higher elasto-plastic resistance, as presented by the H/E and H3/E2 values of 0.026 and 0.0021 GPa, respectively. Increased milling time enables the refinement of grains and reduction in porosity in the Co–Cr–Mo alloy, which in turn increases the alloy's elasto-plastic resistance and enhances its wear resistance. KW - Tribology KW - Wear resistance KW - Friction KW - Powder metallurgy KW - Co–Cr–Mo alloy Y1 - 2023 UR - https://www.sciencedirect.com/science/article/pii/S2238785423012796 U6 - https://doi.org/10.1016/j.jmrt.2023.06.031 SN - 2214-0697 VL - 25 SP - 2152 EP - 2165 ER -