Mechanical and wear behaviour of Mg–SiC–Gr hybrid composites (original) (raw)
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International Journal of Surface Science and Engineering, 2012
Particle reinforced magnesium metal matrix composites (MMCs) and related manufacturing methods are among important research topics because of their low density, high specific stiffness, strength and wear resistance. SiC p /Mg composites are commonly used materials for fabrication of lightweight functional components. Magnesium powders with mean size of 69 μm were used as raw material while reinforcement material was selected as SiC p with the average particle size of 84 μm. Different amounts of SiC p (3, 6, and 9 wt. %) were added to the magnesium matrix and the composite materials were sintered in a vacuum furnace at 590°C. Structural characterisation of the produced composites was performed using several techniques such as scanning electron microscopy (SEM) and X-ray diffraction. The green density of the composite materials increased with SiC p addition. The hardness of the composites was found to be higher than the pure Mg. Reinforcement with 9 wt. % SiC p showed significant increase in the compressive strength of magnesium matrix composites.
Journal of Modern Manufacturing Systems and Technology
This research focuses on the impact of reinforcing particle size in Metal Matrix Composites (MMC). Because of its comprehensive mechanical qualities, MMC is widely employed in the aerospace and automobile industries. In order to increase the mechanical qualities of MMC, researchers are looking into ways to improve its performance. The aim of the research is to use powder metallurgy to fabricate an Al-SiC-Gr hybrid composite and explore its microstructure and mechanical characteristics, such as hardness and impact strength. Powder metallurgy will be utilised in this study, with pure aluminium, silicon carbide, and graphite being mixed in proportion to the volume of the specimen. For Pure Al, 85 %, 80 %, and % were used, while for SiC, 10%, 15%, and 20% were used, and for Gr, 5% was utilised. Hardness Vickers testing and impact testing are among the experiments conducted. The microstructural analysis will also be carried out to assess the particle distribution in the MMC. The microhar...
Materials
In recent years, studies of different properties of hybrid metal matrix composites, as well as very detailed issues, have been published. In this article, ready-made iron, graphite, and silicon carbide powders were used to produce the base material and composites. An analysis of some microstructural and mechanical properties, as well as the tribological behavior of metal matrix composites (MMCs), based on FeGr1 sintered material with the single and hybrid addition of a silicon carbide and graphite was undertaken. During the study, the flexural and compressive strength of MMCs were analyzed and changes of the momentary coefficient of friction, the temperature of friction, as well as wear rates of the MMCs tested were monitored. Based on the results, it was revealed that wear rates decreased 12-fold in comparison to the base material when SiC or SiC + Gr were added. Further research into MMCs with ceramic particle additives is proposed.
Fabrication and Characterizations of Mg/SiC Composite Via Compo-Casting Technique
The present work deals with applying compo-casting technique for fabrication of magnesium matrix composite under an inert gas atmosphere. A 15 Micrometer average diameter size of -SiC particulate was used as a reinforcement material with different volume fractions. The effect of processing technique on SiC distribution within alloy matrix was investigated using light optical microscope and scanning electron microscope. Also, microstructural characterization studies conducted on the composites produced by compo-casting technique revealed a uniform distribution of SiC particulates (at the microscopic scale) and less porosity content. The mechanical properties of pure Mg and Mg-SiC composites have been evaluated. The results show a remarkable increasing in hardness value, tensile strength and 0.2% yielding strength. The increasing in overall mechanical properties revealed to SiC addition to base matrix. However, it is also evident that the strain to failure significantly decreased as the volume fraction of the particulate increased. Also, a good bonding between Mg matrix and SiC reinforcement material was observed in fracture surface SEM micrograph.
Tribological characteristics of Al/SiC/Gr hybrid composites
MATEC Web of Conferences
Metal matrix composites (MMCs) are considered as important engineering materials due to their excellent mechanical, as well as tribological properties. When the metal (or alloy) matrix is reinforced with two or more reinforcements, those composites are the so-called hybrid composites. The aluminum metal matrix composites, reinforced with silicon carbide (SiC) and graphite (Gr), are extensively used due to their high strength and wear resistance. The tribological characteristics of such materials are superior to characteristics of the matrix. This research is presenting influence of the load and the graphite and silicon carbide contents the composites’ wear rate and the friction coefficient.
The effect of SiC – particles – reinforced MgO composites
2016
The influence of SiC particles on the physical and mechanical properties for MgO/SiC composites was investigated. MgO matrix was reinforced with (2 wt%,4 wt%,6 wt % and 8 wt %) of SiC particles which synthesized using powder technology technique. Five samples of each patch have been prepared and supplied to physical properties (green density (G.D) and bulk density (B.D)) and mechanical properties (hardness and compressive strength) were measured. It was observed that the green density of all samples were decreases with increasing SiC particles content. This due to the lower density of SiC than MgO particles. Prepared samples were sintered at different temperatures (800 ˚C, 1100 ˚C, and 1450 ˚C). The bulk density reviled the unaffecting property for samples sintered at 800C and 1100˚C, but it was observed a significant increasing in B.D for samples sintered at higher temperature (1450˚C). It has been found that Vickers hardness, compressive strength and diametrical strength values in...
Wear Behaviour of Mg Alloy Reinforced with Aluminium Oxide and Silicon Carbide Particulates
Light weight metals like magnesium and its alloys are in more use these days in automotive & aerospace industries. Magnesium based hybrid structures which are combinations of magnesium and another material like Aluminium can offer optimal technical performance due to the favorable strength-weight ratio. Materials with improved tribological properties have become the pre-requisite of advanced engineering design. Metal matrix composites (MMCs) exhibit a unified combination of good tribological properties and high toughness of the interior bulk metal when compared with monolithic materials. Stir processing, a microstructure modification technique, has emerged as one of the processes used for fabrication of MMCs. Commercial cast or wrought type Mg-Al-Zn AZ-series alloys, such as AZ91 9 wt.% Al and 1 wt.% Zn, have been widely used in automobiles or electronic appliances. Tribological performance of the fabricated composite will be investigated using pin-on-disc wear & friction monitor. In this paper, a novel approach of making hybrid preforms with two types of reinforcements, i.e., lowcost and different sized particles, for magnesium-based composites is planned. This paper investigates the wear behavior of magnesium alloy (similar to commercially available AZ91) based metal-matrix composites (MMCs) reinforced with Silicon Carbide (SiC) & Aluminium oxide (Al2O3) particulates during dry/wet sliding.
Hybrid materials with the metal matrix are important engineering materials due to their outstanding mechanical and tribological properties. Here are presented selected tribological properties of the hybrid composites with the matrix made of aluminum alloy and reinforced by the silicon carbide and graphite particles. The tribological characteristics of such materials are superior to characteristics of the matrix – the aluminum alloy, as well as to characteristics of the classical metal-matrix composites with a single reinforcing material. Those characteristics depend on the volume fractions of the reinforcing components, sizes of the reinforcing particles, as well as on the fabrication process of the hybrid composites. The considered tribological characteristics are the friction coefficient and the wear rate as functions of the load levels and the volume fractions of the graphite and the SiC particles. The wear rate increases with increase of the load and the Gr particles content and with reduction of the SiC particles content. The friction coefficient increases with the load, as well as with the SiC particles content increase.
Tribology International, 2006
Scratch hardness results conducted on magnesium based metal-matrix composites using submicron SiC (4.8-15.4 wt%) and micron sized Ti (2.7 wt%) particulates are presented. These results are further correlated with composites' bulk mechanical properties such as the normal hardness, the elastic modulus and the yield strength. The data show that the scratch hardness correlates well with the normal hardness and the elastic modulus as all of these parameters increase with an increase in the weight percent of the reinforcing particulates. The scanning electron microscopic study reveals that the composites have greater tendency to form brittle cracks at the edges and wear debris in comparison to pure Mg. The addition of 2.7 wt% of Ti marginally increases the scratch resistance of the composites.