Browsing by Author "Naouel Hezil"

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    Structural, and tribological properties of nanostructured a þ b type titanium alloys for total hip
    (2022-06-12) Naouel Hezil
    Titanium alloys are in demand for various biomedical applications and the most popular among them being, Tie6Ale4V. Hence, in this study, Tie6Ale7Nb are fabricated through the route of mechanical milling using different sintering temperatures. X-ray diffraction and hardness tests were conducted to characterize the developed sams to evaluate the effect of sintering temperatures on the structural and mechanical properties. It is observed that the sams sintered at a temperature of 1250 C had the smallest crystallite and pore size, with enhanced relative density and mechanical properties. Tribological tests were conducted at varying normal loads to characterize the wear and frictional behaviour and showed that the sams sintered at 1250 C presented the lowest friction coefficient and wear rate. © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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    Synthesis and structural and mechanical properties of nanobioceramic (α-Al 2 O 3 )
    (2019-02-19) Naouel Hezil
    The structural and mechanical properties of the nanostructured alpha-alumina (α-Al compact powders, formed by calcination of aluminum hydroxide (Al(OH) gibbsite at different temperatures (100–1100 °C), followed by uniaxial pressing and subsequently hot isostatically pressed (HIP), were investigated using X-ray diffraction, scanning electron microscopy (SEM), and type ball-on-disk oscillating tribometer. X-ray diffraction analysis indicates that the transformation sequence involves the formation of κ-Al as an intermediate phase between χ-andα-Al . The crystallite size of calcined alumina (α-Al )was as small as 8 nm after calcination at 1100 °C. The sliding friction and wear rate were lower in the nanocrystalline samples calcined at 1100 °C at same applied load (3, 6, or 10 N). The enhanced friction and wear resistance were endorsed to have fin microstructure similar to the sample calcined at 1100 °C.