Papers by Zakaria Boumerzoug
International journal of automotive and mechanical engineering, Mar 20, 2024
Aspects in Mining & Mineral Science
Energy Procedia, 2019
Abstract Joining of steel- aluminum thin sheets has been extensively studied at the beginning of ... more Abstract Joining of steel- aluminum thin sheets has been extensively studied at the beginning of 2000 years for automotive applications, in a regard to reduce vehicle weight, reducing the emissions while improving the energy security of the country. In this context the purpose of this work is to realize and study the dissimilar lap joint between a 6061-T6 aluminum alloy and ultra low carbon steel. A recent welding technique, known as "friction stir welding" was used. Joints have been obtained using coated WC–Co tools in terms of durability, the effects of process parameters including welding speeds (50 to 400 mm/min) at a constant rotation rate (1200 tr /min) and Offset in steel plate (0.2 mm) on the microstructures and mechanical properties of the joints were investigated. The joints were evaluated by mechanical testing and metallurgical analysis. Tensile shear tests, optical microscopy, and scanning electron microscopy with energy dispersive spectroscopy (EDS) were the main techniques used. The results showed that with increasing the welding speed, the tensile strength of the joints, increased up to a maximum value. The 3.6 KN maximum value of the tensile strength achieved a traverse speed of 200 mm/min. Microstructure characterization suggested that higher joint strengths were associated with thinner, ≈ 1 µm thick intermetallic reaction layers at joint interfaces.
Advanced Materials Research, Feb 1, 2014
The International Journal of Advanced Manufacturing Technology
Surface Review and Letters
Malaysian Journal on Composites Science & Manufacturing
This study aimed to investigate the effect of sintering temperature on the microstructures and me... more This study aimed to investigate the effect of sintering temperature on the microstructures and mechanical properties of a composite material prepared by powder metallurgy technique. The composite material was a 6061 aluminum alloy matrix reinforced with silicon carbide nanoparticles. The characterization techniques were X-ray diffraction, scanning electron microscopy (SEM) coupled with energy dispersive spectroscopy, optical microscopy, Vickers hardness, and density measurements. The composite material was successfully prepared, as indicated by the homogeneous distribution of the silicon carbide nanoparticles in the aluminum matrix. The sintering temperature has a remarkable effect on the densification of the composite material. It was found that when the sintering temperature increases up to 600°C, the density increases. This phenomenon is also accompanied by an increase in hardness up to 32.2 Hv. We have deduced that the optimal sintering temperature is 600°C.
World Journal of Engineering
Purpose The Ni-base superalloy INC738LC is a precipitation strengthened alloy and is widely used ... more Purpose The Ni-base superalloy INC738LC is a precipitation strengthened alloy and is widely used in hot sections of gas turbine engines owing to its excellent high-temperature strength and high hot corrosion resistance. The purpose of this study is to determine the appropriate welding current of Ni-base superalloy INC738LC after two passes of applying the tungsten inert gas (TIG) welding technique. Design/methodology/approach Ni-base superalloy INC738LC plates were joined by TIG welding technique by varying the welding current (30, 40 and 50 A). Welded specimens were investigated using optical microscopy, tensile tests, Vickers’s micro-hardness tests and X-ray diffraction (XRD). Optical microscopy was used to characterize fusion zone, heat-affected zone and base metal. Tensile test was conducted to characterize weld strength by determining ultimate tensile strength. Scanning electron microscopy was used to investigate the fracture surfaces after tensile tests. Micro-hardness test wa...
Nano research & applications, Jan 29, 2019
A ctually, there is an increasing industry need to join dissimilar materials. Hybrid parts made b... more A ctually, there is an increasing industry need to join dissimilar materials. Hybrid parts made by welding of dissimilar materials such as metal to metal, polymer to polymer, metal to polymer, and metal to ceramic are nowadays in high demand because the objective is to reduce the total weight and maintaining essential physical properties. For these reasons, research works on welding of dissimilar materials is very attractive and many scientific papers have been published in this research field. The objective of this paper is to review the metallurgical aspects of the main published works on dissimilar welded materials by presenting the main joining methods used, problems faced and the future research in this area.
Research & development in materials science, Dec 20, 2021
Figure 1: Schematic representation of the friction surfacing process. Surface engineering is the ... more Figure 1: Schematic representation of the friction surfacing process. Surface engineering is the sub-discipline of material science. Surface coatings are often used in engineering components for wear and corrosion protection. Friction Surfacing (FS) is an emerging surface engineering technology, derived from conventional friction welding, which was invented and patented in 1941 by Klopstock and Neeleands [1,2]. In modern days, friction surfacing has revived interest, consumed by the need for superior overcoat solutions. FS is a solid state process used for the production of metallic coatings. A rotating consumable rod is fed against a substrate under an axial load applied by rotational friction (Figure 1). The friction generates heat which generates a viscoplastic boundary layer at the end of the consumable rod, which travels along the surface of the base metal. The pressure
2022 5th International Conference on Power Electronics and their Applications (ICPEA)
Aspects in mining & mineral science, Aug 31, 2021
International Journal of Automotive and Mechanical Engineering, 2021
Aluminium matrix composites are both strong and lightweight, and are limited in their application... more Aluminium matrix composites are both strong and lightweight, and are limited in their applications due to the proper choice of welding process. Conventional welding that is based on fusion at the welded joint is not suitable because it leads to the formation of certain defects at the welded joint. For this reason, solid-state welding such as diffusion bonding is one of the suitable joining methods, as there will be no melting of any of the constituents. The solid-state diffusion bonding at 520° C of Al6061-SiC nanocomposites was investigated. This composite material was made by powder metallurgy, where aluminium alloy Al6061 was selected as the base metal, and SiC nanoparticles with an average size of 50 nm were added as reinforced particles. The effects of bonding time on the microstructures and mechanical properties of the welded material were investigated. The main characterisation techniques were optical microscopy, scanning electron microscopy coupled with energy dispersive spe...
AIP Conference Proceedings, 2017
In this study, we present the effects of temperature rise on microstructural evolution of industr... more In this study, we present the effects of temperature rise on microstructural evolution of industrial Al wire. This material is used to manufacture electric cables. For the X-ray analysis of the line profile (LPA), we have chosen the so-called «breadth method» whose basic principle is to draw the Williamson-Hall plot. We have observed that the increase in temperature causes the increasing of coherent diffraction domains (crystallites) size, interplanar distance and cell parameter. There is an expansion of the unit cell. XRD patterns refinement were performed using the whole powder pattern modelling procedure implemented in PM2k software. T [K] 293 323 343 363 383 423 443 463 483 503 a [nm] 0.
Le but de ce travail est la mise en evidence de l'effet de la temperature sur les mecanismes ... more Le but de ce travail est la mise en evidence de l'effet de la temperature sur les mecanismes de la dissolution discontinue dans l'alliage Cu-4,6at.%In et en particulier son effet sur le comportement du mouvement du front de reaction, ses caracteristiques et sa capacite de diffusion. Les resultats obtenus par les differentes techniques d'analyse utilisees a cet egard sont coherent entre eux et confirment plusieurs travaux realises dans ce domaine. The aim of this work is to appear the effect of the temperature on the mechanisms of the discontinuous dissolution in the alloy Cu-4,6at. %In and in particular its effect on the behavior of the reaction front its characteristics and capacity of diffusion.The obtain results by the different methods of analysis in this respect are coherent between them and confirm various works archived in this field
Ce travail a pour but de mettre en exergue l’influence de la temperature de vieillissement sur le... more Ce travail a pour but de mettre en exergue l’influence de la temperature de vieillissement sur le mode de la reaction de precipitation dans l’alliage Al- 15 at. % Zn. On a constate, qu’a haute temperature de vieillissement l’apparition de la precipitation continue caracterisee par des precipites fins, par contre a basse temperature on a observe seulement l’evolution de la reaction de precipitation discontinue, ou les precipites formes ont une forme cellulaire avec une faible distance interlamellaire. Les principales methodes d’analyse pour la mise en evidence de ces phenomenes sont : la microscopie optique, la diffraction des rayons X et la microdurete. Mots cles : precipitation - continue - discontinue - cellules - joint de grains.
The decomposition of supersaturated solid solution of numerous alloys during aging occurs through... more The decomposition of supersaturated solid solution of numerous alloys during aging occurs throughout discontinuous cellular reaction resulting in the formation of the alternating structure α and β phases. The discontinuous precipitation is characterized by the presence of sharp reaction front which separates the initial state from the reaction product. In this contribution, the morphology of cellular precipitation in an Cu-4.5 at. % In alloy has been investigated by optical microscopy and electron microscopy (TEM and SEM). The lamellar precipitates develop from the grain boundary into the grain by discontinuous reaction during aging at 673 K. The discontinuous precipitation clearly revealed by optical and scanning electron micrographs was observed to decompose into lamellar structure. It has been observed different orientations of lamellae in the same cell and the discontinuous reaction is more developed in certain sites of matrix, like grain boundaries and interphases of matrix. On the other hand, the shape of reaction front is analyzed by transmission electron microscopy.
Metallurgia Italiana, 2008
The effect of plastic deformation by wire drawing on structure and properties of an industrial el... more The effect of plastic deformation by wire drawing on structure and properties of an industrial electric aluminum wire has been studied. Some heat treatments were applied on the drawn wires. For this investigation, different techniques were used: optical microscopy, transmission electron microscopy, hardness measurements and differential scanning calorimetry. We have observed texture structure along axis wire after the wire drawing process. This cold plastic deformation causes a phenomenon of material consolidation. However, the heat treatments applied on drawn wires lead to recrystallization phenomenon. We have found that in low temperature, the recrystallization reaction is observed only for reduction by wire drawing greater than 30 %.
Welding is used extensively for pipe welding, aerospace, aviation, biomedical implants, fabricati... more Welding is used extensively for pipe welding, aerospace, aviation, biomedical implants, fabrication of race cars, choppers, etc. Generally, the metallurgy of the welded joint performed by thermal fusion joining process can be categorized into two major regions, the fusion zone (FZ) and the heat-affected zone (HAZ). The heat-affected zone (HAZ) is a region that is thermally affected by the welding treatment. The main difficulty associated with welding is the prevention of unexpected deterioration of properties as a result of the microstructure evolutions which reduce the resistance to brittle fracture in the heat-affected zone (HAZ). Properties of the HAZ are different from those of the base material. According to the literature, the HAZ is the most problematic area in the high strength steels weld. For this reason, many research works investigated this critical zone in welded joint. The main research questions and results related to the HAZ will be presented.
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Papers by Zakaria Boumerzoug