Mechanical behavior of AA2024/SiC AMCs (original) (raw)
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Experimental Investigation of Mechanical Properties of Al2024-SiC Metal Matrix Composite
2017
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. To achieve these objectives two step-mixing method of stir casting technique has been adopted and subsequent property analysis has been made. Aluminum (Al 2024) and SiC (150 µm) has been chosen as matrix and reinforcement material respectively. The present study was aimed at evaluating the physical properties of Aluminum in the presence of silicon carbide at varying compositions. Consequen tly aluminum metal matrix composite combines the strength of the reinforcement with the toughness of the matrix to achieve a combination of desirable properties not available in any single conventional material. The compositions were added up to the ultimate level and stir casting method was used for the fabrication of aluminum metal matrix composites. Experiments have been conducted by varying weight fraction of SiC (5%, 10%, 15%, 20%, 25%), while keeping all other parameters constant. The results were evaluated by Tensile Test, Rockwell Hardness Test, Charpy Impact Test (including micro-structure), Compression Test and Heat Treatment In terms of a metal-matrix composite, an Aluminum 2024 alloy as the matrix and silicon carbide as the reinforcement is considered to be an excellent structural material used in both the aeronautic/aerospace industry and also the automotive industry. This is due to its high strength-to-weight ratio and its high thermal conductivity.
Evergreen, 2019
This study investigates the effect of addition of SiC particles on Al 6061 alloy. The composites are prepared with varied (0, 2, 4, 6 and 8) weight percent of SiC particles through electromagnetic stir casting technique. Scanning Electronic Microscope (SEM) is employed to examine the microstructure of the fabricated composite and results depict that SiC content were uniformly dispersed in the Al 6061 matrix. Density of the composite is increased due to high density of SiC particles in comparison to Al 6061 alloy. Hardness and tensile tests are performed to investigate the mechanical properties of composite. The hardness and tensile strength is significantly improved up to 8 wt % of SiC particles. The novelty of this archival work lie in fact that few experiments have been carried out for Al 6061/SiC composite and some significant insight for the electromagnetic stir casting is achieved in the performed experiment.
The present research involved the accumulation of aluminium AA-2618 alloy, weighed along with calculated amounts of increasing weight percentage of white SiC particulates. The composites were separately prepared by combining the matrix material and the reinforcements by using Stir Casting technique before the individual specimens were machined to specified standard testing dimensions. Conduction of tensile tests of all composite test specimens followed. The results and conclusions were analyzed and compared with the individual results of other composite specimens and the base alloy of the same category to help determine the nature of the trends that arise due to the incremental addition of reinforcement particulates into the matrix material in order to determine their potentiality for application in various industrial fields and sectors.
Metal matrix composites are the resultant of combination of two or more elements or compounds, possessing enhanced characteristics than the individual constituents present in them. This paper deals with the fabrication of Al 2014-SiC composite and investigation of its Microstructure and Mechanical properties. 2014 Aluminium alloy is characterized by good hardness. It is selected as the base metal. The Silicon Carbide is characterized by good strength and low density (3.21 g/cm3). It is chosen as the reinforcement. Silicon Carbide is coated with Nickel by electroless method to increase its wettability and binding properties. The fabrication of metal matrix composites is done by stir casting in a furnace, by introducing the required quantities of reinforcement into molten Aluminium alloy. The reinforcement and alloy is mixed by means of stirring, with the help of a stirrer. The base alloy and the composites are then tested for mechanical properties such as tensile strength, flexural strength, impact strength and hardness. The fabricated samples have higher tensile strength and impact strength than the alloy. Microstructure of the samples, are analyzed using optical microscope.
Synthesis and Evaluation of Mechanical properties of Al/ Sic Composite by Stir Casting Method
The main focus for this project is to find out the betterproportion of the AA6061 – Sic composite by analyzing their mechanical properties which has been made by stir casting method.The Mechanical properties of AA6061 Aluminium matrix composites (AMC's) when reinforced with Sic with varying weight percentages that can be used for high performance applications such as automotive ,aerospace, military and electrical industries has been evaluatedStir casting has been used to synthesize Al/Sic MMCs by reinforcing silicon carbide particles into aluminum matrix. The reason for using stir casting is to develop technology for the development of MMCs at affordable cost. The selection of Sic as reinforcement and Al as matrix isbecause of their easy availability. The practical data acquired, analyzed and optimized will beinterpreted in the light of information available in the literature and be shared with the relevant industries. The present work was mainly carried out to characterize the Sic/Al composite which was produced by reinforcing the various proportions of Sic (5, 10, and 15%) in aluminum matrix using stir casting technique. Itis noted that the volume fraction of Sic in the composite is gradually increased, the hardness and impact energy increase. However, beyond a level of 25-30 percent Sic, the results are not very consistent, and depend largely on the uniformity of distribution of Sic in the aluminum matrix.This work is focused to study the change in behavior of AA6061 aluminum alloy by adding different percentage of Sic Then tensile tests, hardness test, impact test performed on these samples which are produced by stir casting to investigatethe improved physical and mechanical properties.
IOP Conference Series: Materials Science and Engineering, 2018
Aluminum reinforced with silicon carbide composites areextensively used in automobile industries and aerospaceowing to their favourable microstructure and improved mechanical behaviour with respect to pure aluminium but at a lower cost. Aluminium is remarkable for the low density and its ability to resist corrosion. The aim of present study istoevaluate the mechanical and microstructural properties of aluminum with silicon carbide (average particle size 30-45μm) reinforced in varying weight percentages (wt %) ranging from 0-15 wt% in a step of 5% each. Ultimate tensile strength, micro hardness and density of the fabricated composites were investigated as a function of varying SiC wt%. Microstructure analysis was carried out on casted composites using optical microscopy and scanning electron microscopy. From micrographs it is clear that fair distribution of reinforcing particles in the matrix and also observed some clustering and porosity in the cast material. Results revealed that, the addition of SiC reinforcement in the aluminum matrix increases the hardness and ultimate tensile strength gradually from 23 HV to 47 HV and 84 MPa to 130 MPa respectively.
Characterization of Aluminium Alloy/ SiC Metal Matrix Composites
The present research involved the conduction of hardness and compression tests of aluminium AA-2618 alloy matrix composite reinforced with white Silicon Carbide particulates. The composites were fabricated using Stir Casting technique of liquid metallurgy and machined to the required ASTM standards. The hardness tests were conducted using a Brinell hardness tester, whereas the compression tests were conducted using a Universal Testing Machine. Appropriate readings were taken during the conduction of the tests in order to be compared with each other as well as the base alloy. The results and conclusions were analyzed and compared to help determine the nature of the trends that arise due to the incremental addition of reinforcement particulates into the matrix material on the hardness and compressive behavior of the composites, in order to determine their potentiality for application in various industrial fields.
stir and compocasting techniques were used to produce Al/SiC composite materials. Aluminium alloy (A356) was used as a matrix for producing such composites with different volume fractions of particulate SiC. The microstructural characterization studies conducted on the composites produced by compocasting technique revealed a more uniform distribution of SiC particulates and less porosity content when, compared to the composites prepared by stir casting technique. X-ray diffraction technique was used to check the structure of the obtained composites. The density measurements show that the obtained composites contained little porosity of less than 2%. Moreover, the amount of porosity in the composites increased with increasing the volume fraction and decreasing size of reinforcement particles. Some mechanical properties such as hardness, wear resistance and tensile strength were measured as a function of SiC content. The hardness values for cast composites using 50 μm SiC with different SiC volume fraction prepared by stir and compocasting techniques were measured in the range of 95-180 and 101-191 BHN, respectively. Also, the tensile strength increases with increasing the volume fraction of particulate SiC. Moreover, wear resistance behavior for composites prepared by compocasting technique were improved with increasing SiC content and SiC particle size. Whereas, wear resistance behavior for composites prepared by stir casting technique were improved with increasing SiC content and decreasing in SiC particle size
Characterization of Mechanical Properties and Microstructure of Aluminium Alloy-SiC Composites
Materials Today: Proceedings, 2015
In the present paper, an effort has been made to study about the mechanical properties of composites prepared using Al-18wt%Si as the base metal. The base metal was reinforced with using SiC particles having an average size of 60μm. The composite was produced using a combination of bottom pouring stir cast machine and a horizontally rotating centrifugal casting machine. The prepared samples of the composite was checked for various mechanical properties like hardness, tensile strength, toughness etc and the results obtained where then compared with the mechanical properties of alloy cast under the same conditions. It was hence found that, the addition of SiC reinforcing particles have increased the mechanical properties of the alloy to a greater extent but has reduced its toughness.
PRODUCTION & CHARACTERIZATION OF AL 2024-SIC P METAL MATRIX COMPOSITE USING STIR CASTING
Journal of Mechanical and Production Engineering (JMPE), 2016
The substantial use of aluminum reinforced with silicon carbide composites in various structural applications has led to the need of finding a efficient technical production techniques for these composites. Uniformity, machinability and intra-grain reactions of the constituents represent the most problems related to these composites. Production of uniform and strong components made from aluminum-silicon carbide composites can be achieved with the help of stir casting. Metal Matrix Composites (MMCs) have developed a high interest in modern times for potential applications in aeronautical and automobile industries. Achievement of a uniform distribution of reinforcement in the matrix is difficult and it has direct effect on the properties of the composite. Present thesis attempts to develop aluminum based silicon carbide particulate Metal Matrix Composites. Aluminum (Al2024) has been chosen as matrix and SiC (320-grit) as reinforcement material. Trials are done by changing the weight fraction of SiC (10% &15%), while other parameters are kept constant. An increase in hardness and strength has been observed with the increase in weight percentage of SiC. The results were further justified by comparing with other investigators.