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Search Results: 1 - 10 of 12958 matches for " Metal matrix composites "
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Evaluation of HEBM Mechanical Alloying of Al2O3—356/7075 Powder Mixture  [PDF]
G. Govender, Lilian Ivanchev, H. Burger, A. Mulaba, H. Chikwande
Open Journal of Composite Materials (OJCM) , 2012, DOI: 10.4236/ojcm.2012.22007
Abstract: Particle reinforced aluminium alloy metal matrix composites (MMC) have proven to be one of the advanced materials capable of replacing conventional structural alloys. However, the demand for such materials has been confined to high cost applications due to their complex processing. A preliminary mechanical alloying (MA) of metal powder with ce-ramic particulates by High Energy Ball Mill (HEBM) processing is a step of MMC manufacturing process. In this paper mechanical alloying of aluminium alloys A356 and 7075 powder with Al2O3 and SiC par-ticulates using two types of HEBM was investigated. The effect of dispersed phase strengthening mechanism on three aluminium grade alloys was evaluated by micro hardness measurement. Microstructure investigation confirms the achieved strengthening results. It was established that by measuring hardness of alloyed aluminium particles with low load reliable information on the alloying effect can be achieved.
Experimental Investigation on the Effect of Reinforcement Particles on the Forgeability and the Mechanical Properties of Aluminum Metal Matrix Composites  [PDF]
S. Das, R. Behera, A. Datta, G. Majumdar, B. Oraon, G. Sutradhar
Materials Sciences and Applications (MSA) , 2010, DOI: 10.4236/msa.2010.15045
Abstract: The wide choice of materials, today’s engineers are posed with a big challenge for the right selection of a material and as well as the right selection of a manufacturing process for an application. Aluminium Metal Matrix Composites is a relatively new material among all the engineering materials. It has proved its position in automobile, aerospace, and many other engineering applications due its wear resistance properties and due to its substantial hardness. One of the most important criteria is forgeability by which the workability of the material can be determined. The nature of distribution of reinforcing phase in the matrix greatly influenced the properties of Aluminum Metal Matrix Composites. The forgeability of Aluminum Metal Matrix Composites, which are produced by powder metallurgy method, are greatly depends on the size and percentage of reinforcement materials, compacting load, sintering temperature and soaking time etc. In this present work, the forgeability of Aluminum Metal Matrix Composites reinforced with silicon carbide (400 meshes) has investigated. A comparison have been made with different types of Aluminum Silicon Carbide Metal Matrix Composite materials contains 0%5%,10%,15%&20% by weight of silicon carbide. The mechanical properties like hardness of the different composites have also investigated. It is observed that the forgeabilty of the composites decreases with increasing the wt% of SiC but the mechanical properties like hardness enhanced on increasing the wt% of SiC.
Equal Channel Angular Pressing of Al-SiC Composites Fabricated by Stir Casting  [PDF]
Farouk Shehata,Nahed ElMahallawy,Mohamed Arab,Mohamed Agwa
Open Journal of Metal (OJMetal) , 2013, DOI: 10.4236/ojmetal.2013.32a1004
Abstract: Stir casting method was used to produce conventional metal matrix composites (MMC) with fairly homogenous dispersion of reinforcement material. Commercial pure aluminum and silicon carbide particles (50 μm) were selected as matrix and reinforcement materials respectively. The matrix was first completely melt and kept constant at 750°C. Then SiC powder preheated to 800°C was added during stirring action. No wetting agents were used. The melt mixture was poured into a metallic mold. The composite contents were adjusted to contain 5% and 10% SiC. The as-cast composites were processed by Equal Channel Angular Pressing (ECAP) route A. The microstructure and mechanical properties were studied. Results indicated that as cast AlSiC composites can be successfully fabricated via a cheap conventional stir casting method, giving fairly dispersed SiC particle distribution and having low porosity levels < 3.6%. The mechanical properties have improved compared to as cast composites. ECAP technique has greatly reduced SiC particles from 50 to 3 μm. After the first ECAP pass, yield strength has almost twice its value in the as cast composites. The maximum yield of 245 MPa obtained after 8 passes is almost four times the corresponding values of the as cast MMC composites. Hardness has also increased to 1.5 times its value in the as cast composites after one ECAP pass. The maximum hardness of 71 HRB obtained after 8 passes, which is almost 3.5 times the corresponding values of the as cast MMC composites.
Equal Channel Angular Pressing of Al-SiC Composites Fabricated by Stir Casting  [PDF]
Farouk Shehata, Nahed ElMahallawy, Mohamed Arab, Mohamed Agwa
Open Journal of Metal (OJMetal) , 2013, DOI: 10.4236/ojmetal.2013.32A1004
Abstract:

Stir casting method was used to produce conventional metal matrix composites (MMC) with fairly homogenous dispersion of reinforcement material. Commercial pure aluminum and silicon carbide particles (50 μm) were selected as matrix and reinforcement materials respectively. The matrix was first completely melt and kept constant at 750°C. Then SiC powder preheated to 800°C was added during stirring action. No wetting agents were used. The melt mixture was poured into a metallic mold. The composite contents were adjusted to contain 5% and 10% SiC. The as-cast composites were processed by Equal Channel Angular Pressing (ECAP) route A. The microstructure and mechanical properties were studied. Results indicated that as cast AlSiC composites can be successfully fabricated via a cheap conventional stir casting method, giving fairly dispersed SiC particle distribution and having low porosity levels < 3.6%. The mechanical properties have improved compared to as cast composites. ECAP technique has greatly reduced SiC particles from 50 to 3 μm. After the first ECAP pass, yield strength has almost twice its value in the as cast composites. The maximum yield of 245 MPa obtained after 8 passes is almost four times the corresponding values of the as cast MMC composites. Hardness has also increased to 1.5 times its value in the as cast composites after one ECAP pass. The maximum hardness of 71 HRB obtained after 8 passes, which is almost 3.5 times the corresponding values of the as cast MMC composites.

Development of Aluminium Based Silicon Carbide Particulate Metal Matrix Composite  [PDF]
Manoj Singla, D. Deepak Dwivedi, Lakhvir Singh, Vikas Chawla
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2009, DOI: 10.4236/jmmce.2009.86040
Abstract: Metal Matrix Composites (MMCs) have evoked a keen interest in recent times for potential applications in aerospace and automotive industries owing to their superior strength to weight ratio and high temperature resistance. The widespread adoption of particulate metal matrix composites for engineering applications has been hindered by the high cost of producing components. Although several technical challenges exist with casting technology yet it can be used to overcome this problem. Achieving a uniform distribution of reinforcement within the matrix is one such challenge, which affects directly on the properties and quality of composite material. In the present study a modest attempt has been made to develop aluminium based silicon carbide particulate MMCs with an objective to develop a conventional low cost method of producing MMCs and to obtain homogenous dispersion of ceramic material. To achieve these objectives two step-mixing method of stir casting technique has been adopted and subsequent property analysis has been made. Aluminium (98.41% C.P) and SiC (320-grit) has been chosen as matrix and reinforcement material respectively. Experiments have been conducted by varying weight fraction of SiC (5%, 10%, 15%, 20%, 25%, and 30%), while keeping all other parameters constant. The results indicated that the ‘developed method’ is quite successful to obtain uniform dispersion of reinforcement in the matrix. An increasing trend of hardness and impact strength with increase in weight percentage of SiC has been observed. The best results (maximum hardness 45.5 BHN & maximum impact strength of 36 N-m.) have been obtained at 25% weight fraction of SiC. The results were further justified by comparing with other investigators.
Study of Wear Properties of Al-SiC Composites  [PDF]
Manoj Singla, Lakhvir Singh, Vikas Chawla
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2009, DOI: 10.4236/jmmce.2009.810070
Abstract: Al–SiC composites containing four different weight percentages 5%, 10%, 20% and 25% of SiC have been fabricated by liquid metallurgy method. Friction and wear characteristics of Al–SiC composites have been investigated under dry sliding conditions and compared with those observed in pure aluminium. Dry sliding wear tests have been carried out using pin-on-disk wear test rate normal loads of 5, 7, 9 and 11 Kgf and at constant sliding velocity of 1.0m/s. Weight loss of samples was measured and the variation of cumulative wear loss with sliding distance has been found to be linear for both pure aluminium and the composites. It was also observed that the wear rate varies linearly with normal load but lower in composites as compared to that in base material. The wear mechanism appears to be oxidative for both pure aluminium and composites under the given conditions of load and sliding velocity as indicated by scanning electron microscope (SEM) of the worn surfaces. Further, it was found from the experimentation that the wear rate decreases linearly with increasing weight fraction of silicon carbide and average coefficient of friction decreases linearly with increasing normal load and weight fraction of SiC. The best results have been obtained at 20% weight fraction of 320 grit size SiC particles for minimum wear.
Preparation of Al-5Ti Master Alloys for the In-Situ Processing of Al-TiC Metal Matrix Composites  [PDF]
Satish Babu Boppana, K . Chennakeshavalu
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2009, DOI: 10.4236/jmmce.2009.87049
Abstract: The present paper reports on the preparation of various Al-5Ti master alloys by the reaction of halide salt (K2TiF6) with molten Al in an induction furnace. The master alloys are supposed to be used for the in-situ processing of Al-TiC Metal Matrix Composites. During the preparation of these master alloys the reaction temperature was varied from 800-1000℃ with the intervals of 100℃, while the reaction time was varied at 45, 60 and 75 min. The binary master alloys prepared were characterized using image analyzer and particle size was measured. It was found that the master alloy Al-5Ti prepared at 8000C, and 45 minutes had a minimum particle size of 9.0 micrometer. Also it is observed that the population of particles less than 10 micrometer decreases at higher reaction temperature.
Effect of Copper and Silicon Carbide Content on the Corrosion Resistance of Al-Mg Alloys in Acidic and Alkaline Solutions  [PDF]
Ahmad T. Mayyas, Mohammad M. Hamasha, Abdalla Alrashdan, Adel M. Hassan, Mohammed T. Hayajneh
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2012, DOI: 10.4236/jmmce.2012.114025
Abstract: In this study, corrosion resistance of cast aluminum based alloys and composites reinforced with silicon carbide has been investigated. Different Al-Mg-Cu alloys and Al-4wt.%Mg-Cu/SiC composites reinforced with 5 or 10 vol.%SiC were subjected to corrosive media (acidic: 1.0M HCl and alkaline: 1.0M NaOH) using weight loss method to evaluate their corrosion resistance. The results show that introducing copper and silicon carbide have a negative effect on the corrosion resistance of monolithic aluminum; however, Al-based composites still being attractive materials to replace steel parts in automotive and aircraft industries and hence studying their corrosion resistance is of high importance. Scanning electron microscopy (SEM) and Energy-dispersive X-ray (EDS) were used to show the degree of attack and of acidic and alkaline solution on the surface of the investigated materials.
The similarity of the water system to the real foam making system
J. Grabian
Archives of Foundry Engineering , 2011,
Abstract: Cellular structures are characterized by a number of unique properties that can be successfully utilized in the construction of machines and vehicles. Their low density makes them an ideal filling material for laminated structures. The use of the proper method of foam production affects its structure (e.g. the distribution, openness and size of pores, wall thickness between pores etc.), consequently the material properties are affected. Another important issue is the material itself used for metal foam production, as materials meeting increasingly new requirements are being sought, among which are metal composite materials.This work presents theoretical considerations referring to foam making by comparing the water system to a real foam production system.
Evaluation of Filler Distribution in Particulate Reinforced Composites  [PDF]
Kurganova Yuliya, Lopatina Yuliya, Yijin Chen
Journal of Materials Science and Chemical Engineering (MSCE) , 2015, DOI: 10.4236/msce.2015.37014
Abstract:

Aluminum matrix particulate reinforced composites are of significant interest to industry, but it’s difficult to provide stable properties for this group of material. The mechanical properties of metal matrix composites are deeply influenced by the distribution of reinforcement particulates in the matrix. In this paper uniformity of SiC particles distribution in Al-based composites produced by stir casting and powder metallurgy technique is assessed. Analysis is carried out by means of classical and computer quantification metallographic image analysis methods. In addition, we suggest setting hardness distribution in cross section of samples as an indicator of reinforcement distribution uniformity in the matrix.

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