Browsing by Author "Abboudi Abdelaziz"

Now showing 1 - 7 of 7
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    Characterization of Mo–V–N Coatings Deposited on XC100 Substrate by Sputtering Cathodic Magnetron
    (Metallofiz. Noveishie Tekhnol, 2017-11-21) Chermime Brahim; Abboudi Abdelaziz; Djebaili Hamid; Brioua Mourad
    The aim of this work is the characterization of ternary molybdenum–vanadium nitride (Mo–V–N) coatings deposited on silicon and XC100 steel substrates by the reactive radiofrequency dual magnetron sputtering with different contents of the Mo and V targets and nitrogen as reactive gas. The metal-target bias voltages are varied from 300 to 900 V. The hardness, surface morphology, microstructure and composition are studied by nanoindentation, scanning electron microscopy, atomic-force microscopy, and x-ray diffractometry. The Mo–V–N films manifest pyramidal surface morphology, high roughness (of 13.5 nm), but low mechanical properties. Hardness and Young’s modulus are found in the ranges of 10–18 GPa and 100–335 GPa, respectively. The residual stresses of coatings are compressive and varied between 0.8 GPa and 2.5 GPa (calculated with the Stoney formula).
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    Effect of Film Thickness on the Structural and Tribo-Mechanical Properties of Reactive Sputtered Molybdenum Nitride Thin Films
    (Metallurgical and Materials Engineering Association of Metallurgical Engineers of Serbia AMES, 2022-06-05) Abboudi Abdelaziz; Aissani Linda; Saoudi Abdenour; Djebaili Hamid
    The current study aims to examine the impact of nitrogen content and film thickness on the structural and tribo-mechanical characteristics of reactive sputtered MoN thin films. Molybdenum nitride thin films with thicknesses ranging from 0.2 to 1.25 m have been applied to steel and silicon substrates for this purpose, with various amounts of controlled atmosphere (Ar+N2). Then, the films are characterized using XRD (X-ray diffraction), EDX (energy dispersive X-ray analysis), SEM (scanning electron microscopy), FTIR (Fourier-transform infrared spectroscopy), and nanoindentation. The residual stress was measured using the Stoney formula. Results show that a high compressive residual stress of -5.7 GPa is present in the film with a 0.3 μm thickness and gradually decreases with increasing film thickness. Above 1 µm of film thickness, there is no change in the density of the MoN films. Also, the coating hardness and Young’s modulus vary between 9.5 and 35 GPa, and 266 and 320 GPa, respectively, depending on nitrogen content and film thickness. Lastly, the friction of the MoN thin films is estimated to be around 0.55, which proves that the oxide is being slowly removed.
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    Effect of Heat Treatments on the Mechanical Properties of a Form Tool
    (JOURNAL OF NANO- AND ELECTRONIC PHYSICS, 2018-06-25) Chermime Brahim; Abboudi Abdelaziz; Djebaili Hamid
    During the follow-up of the cutting tools in the production workshops, we noticed that the cutting tools operate in severe conditions, for this we thought to improve their mechanical characteristics and increase their yield. Two key factors influencing these tools, namely geometry and heat treatment. In this study we chose the heat treatment, from a basic fast steel form tool, after making the milling cutter in the tool shop we proceeded to a revenue treatment to remove austenite residues. The purpose of our work is to increase the machining quota of a Z80WCV 18-04-01 high speed steel mill, for this reason our study is based on the reduction of residual austenite by incomes. cumulated after prior quenching for different austenitization temperatures (1240, 1260 and 1270 °C)
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    Effect of MoZrN Coating on a Steel XC100
    (Metallofiz. Noveishie Tekhnol, 2016-11-22) Abboudi Abdelaziz; Meddour Belkacem; Chermime Brahim; Djebaili Hamid; Brioua Mourad
    The zirconium nitride ZrN coatings are deposited on substrates of XC100 steel using physical vapour deposition (PVD) technique. Coatings based on nitrides of transition metals (Nb, Zr, Ti, V, ) developed by PVD are known to increase the life of cutting tools, and so they naturally have seen a rapid industrial growth. It is possible to produce ZrN-coatings with variations of nitrogen partial pressure, the residual stresses, the thickness of the thin film, and the friction coefficient depending on the nitrogen content. Usage of nitrogen is a good way to enhance wear resistance and effectiveness in tribological applications.
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    Mechanical and Structural Studies of Ternary Mo–Zr–N Layers Deposited on Substrate by PVD
    (Metallofiz. Noveishie Tekhnol, 2017-07-04) Abboudi Abdelaziz; Chermime Brahim; Djebaili Hamid; Brioua Mourad
    Our study of ternary Mo–Zr–N thin layers is novel with the objective of improving certain mechanical and tribological characteristics and of finding the appropriate stoichiometry to have the microstructure, which orientates to the desired properties, using the characterization techniques: SEM, XRD, EDS, XPS, WDS and similar methods as well as nanoindentation, alternative tribometry and scratch test. The morphological study of ternary Mo–Zr–N coating shows that the (111) orientation of texture is preferred essentially due to residual internal stresses. During the development of the Mo–Zr–N deposits, we have noticed that the addition of Zr results in multiphases consisting of binary ZrN, MoN and MoZrN nitrides with a prism-shaped structure. The coefficient of friction is low for Mo–N coating and low zirconium levels. The Young’s modulus takes values almost very close that is indicated for values below 100 at.% of Zr. The crystalline structure does not affect the resistance capacity of the material. The introduction of zirconium particles destabilizes the compound because zirconium atomic radius (0.138 nm) is higher than that of molybdenum (0.126 nm), and the lattice is distorted that explains these residual stresses.
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    Tribological Study of Molybdenum Nitrides Under the Effect of Vanadium
    (JOURNAL OF NANO- AND ELECTRONIC PHYSICS, 2018-01-01) Abboudi Abdelaziz; Chermime Brahim; Djebaili Hamid; Boulehrouz Salim
    Our study of the MoVN ternary thin films has the objective of improving certain tribological and mechanical characteristics and of finding the appropriate stoichiometry to have the microstructure that corresponds to the desired properties using the characterization techniques: SEM -XRD-EDS-XPS- WDS. Nano-indentation and the scrash-test. Note that wear and friction resistance does not depend on the internal characteristics of the materials in contact as is usually the case for mechanical properties, but rather depends mainly on the structure and morphology and experimental conditions. Hypotheses will be presented in order to explain the tribological behavior of deposits and to match them to their physicochemical and mechanical properties. The EDS-XPS microanalyses revealed that the atomic ratio (N/V) ~ 1 for VN, that (N/Mo)  1.22 for MoN and that (N/(Mo + V))  1 for the MoVN ternary films. From this figure we find that the MoN film has an average coefficient of friction of 0.65. This film then has good wear resistance. Comparing this value with that obtained on MoN coatings deposited by the Alcatel PVD sputtering system on AISI substrate, (which is of the order of 0.45) therefore better than that deposited on XC100 and Si . This variation can be explained by the nature that differs between the coating/substrate interface and the other links that are generated. By comparing the Mo-V-N and MoN films, we can then say: increasing the V content in the Mo-V-N film is more favorable for the production of films with a low average value of the coefficient of friction. Which remains lower than that of MoN film (0.65)? So this is regular with the mechanical properties.
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    Vickers Hardness Test of Steel Pipes Welded by High Frequency Induction
    (JOURNAL OF NANO- AND ELECTRONIC PHYSICS, 2022-01-01) Mansouri Khelifa; Abboudi Abdelaziz; Djebaili Hamid
    The rapid development of design technology and strong market competition have prompted us to look into the field of production of steel pipes with a process that perfectly meets industrial requirements, which is high frequency (HF) induction welding, which is the most common welding process to produce steel pipes. This process is currently better known for the manufacture of pipes of different diameters at the Tube Gaz unit in Tebessa (Algeria). Among the various known destructive tests, the Vickers hardness test is used to control the pipe. This test will allow us to determine the evolution of hardness in the longitudinal and transverse directions of the welded joint. The objective of our study is based on the characterization of the processes controlling the mechanical behavior of steel pipes (type S235) with a thickness of 2.2 mm and an outside diameter of 70.70 mm, welded by HF induction. The analysis shows the existence of very diverse microstructures in the studied welded joint.