TY - GEN A1 - Fellah, Mamoun A1 - Hezil, Naouel A1 - Touhami, Mohamed Zine A1 - Samad, Mohammed Abdul A1 - Obrosov, Aleksei A1 - Bokov, Dmitry O. A1 - Marchenko, Ekaterina A1 - Montagne, Alex A1 - Iost, Alain A1 - Alhussein, Akram T1 - Structural, tribological and antibacterial properties of (α + β) based ti-alloys for biomedical applications T2 - Journal of Materials Research and Technology N2 - Implant-related follow up complications resulting from poor implant integration, delamination, chipping, mechanical instability, inflammation or graft-vs-host reaction may lead to low patient tolerance, prolonged care and sometimes leading to a second surgery. Hence, there is an urgent need for developing biomaterials which will help to overcome the above compatibility problems. Ti based alloys have been widely used for biomedical applications, due to their excellent properties, such as low modulus, high biocompatibility and high corrosion resistance. In order to further improve the physical, mechanical and tribological properties of these alloys, microstructural modification is often required. Hence, this study aims to develop and evaluate the structural and tribological behavior of Hot Isostatic Pressed (HIPed) and sintered Ti-6Al-7Nb samples containing niobium, which is less toxic and less expensive as compared to the usual alloying element, vanadium (Ti-6Al-4 V). The Ti-6Al-7Nb alloys were fabricated by using nanoparticle powders milled for different durations (2, 6, 12 and 18 h) to evaluate the effect of milling time on the morphological and structural properties. Friction and wear tests were carried out on the (HIPed) and finally sintered Ti-6Al-7Nb alloy samples, to evaluate their tribological properties under different applied loads (2, 8 and 16 N), with an alumina α-Al2O3 ball as a counter face using an oscillating tribometer. The physical characterization of the nanopowders formed using different milling times indicated that the particle and crystallite size continually decreased with increasing milling time, while the microstrain increased. It is observed that the friction coefficient and wear rate for the samples prepared by powders milled for 18 h and tested under 2 N were lowest with values of 0.25 and 1.51 × 10−2 μm3∙N-1 μm-1, respectively compared to other milled samples. This improvement in tribological properties is attributed to the grain refinement at high milling times. The antibacterial evaluation of the fabricated alloys showed an improvement in antibacterial performance of the samples milled at 18 h compared to the other milling times. KW - Mechanical properties KW - Hot Isostatic Pressure KW - Ti-6Al-7Nb KW - Powder metallurgy KW - Milling time KW - Physical characterization KW - biomaterials KW - microstructure Y1 - 2020 UR - https://www.sciencedirect.com/science/article/pii/S2238785420318421 U6 - https://doi.org/10.1016/j.jmrt.2020.09.118 SN - 2238-7854 VL - 9 IS - 6 SP - 14061 EP - 14074 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 -