scholarly journals Investigations on Mechanical Properties of Heat-treated Aluminum 7075/Graphite Powder/Bagasse ash Hybrid Metal Matrix Composites

2019 ◽  
pp. 258-266
Author(s):  
Madhu M G ◽  
H K Shivanand ◽  
Prof Maibusab ◽  
Kiran R
Keyword(s):  
Tensile Strength ◽  
Metal Matrix Composites ◽  
Compression Strength ◽  
Metal Matrix ◽  
Testing Machine ◽  
Graphite Powder ◽  
Matrix Composites ◽  
Astm Standard ◽  
Heat Treated ◽  
Al 7075

Metal Matrix Composites (MMC’s) consist of either pure metal or an alloy as the matrix material, while the reinforcement generally a ceramic material. Aluminium composites are considered as one of the advanced engineering materials which have attracted more and more benefits. Now a days these materials are widely used in space shuttle, commercial airlines, electronic substrates, bicycles, automobiles, etc., Among the MMC’s aluminium composites are predominant in use due to their low weight and high strength. The key features of MMC’s are specific strength and stiffness, excellent wear resistance, high electrical and thermal conductivity. Hence, it is proposed to form a new class of composite. Al 7075 alloy reinforced with Graphite Powder and Bagasse ash to form MMC using Stir casting. The MMC is obtained for different composition of Graphite powder and Bagasse ash particulates (varying Graphite powder with constant Bagasse ash and varying Bagasse ash with constant Graphite powder percentage). The test specimens are prepared as per ASTM standard size by turning and facing operations to conduct tensile tests, compression tests and hardness tests. The specimens are tested for tensile strength and compression strength as per ASTM standard E8 by using universal testing machine and hardness as per ASTM standard E10 at different loads by using Brinell hardness testing machine. Through the results, it is concluded that the MMC obtained has got better tensile strength, compression strength and hardness properties when compared to non-heat-treated Al 7075 alone.

scholarly journals Influence of Solutionising and Aging Treatments on Mechanical Behavior of Stir-Cast Eutectoid Steel Powder Reinforced Al 7075 Metal Matrix Composites

2018 ◽  
Vol 15 (3) ◽  
pp. 5583-5591 ◽  
Author(s):  
Rajesh Rajesh ◽  
Sathyashankara Sharma ◽  
M. C. Gowrishankar
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Matrix Material ◽  
Steel Powder ◽  
Stir Casting ◽  
Matrix Composites ◽  
Eutectoid Steel ◽  
Al 7075

Al 7075 is a good choice as a matrix material to prepare metal matrix composites (MMCs) owing to its better specific tensile strength and toughness. Among different types of the recently introduced composite materials, particles reinforced MMC and in particular aluminium as matrix material have been found to have enormous industrial applications like automotive and aerospace sectors. In the present study, mechanical properties of Al 7075-eutectoid steel powder metal matrix composites is assessed in age-hardened and as-cast conditions. The heat treatment processes are carried out in atmospheric condition. Eutectoid steel (water hardenable tool steel - W1grade) reinforced aluminium 7075 is an attempt to investigate the role of micro-constituent phases on property alterations of metal matrix composites. As an economical and promising route for MMC, liquid stir casting technique is used to reinforce synthesised steel powder in the matrix of Al 7075. Heat treatment is performed as a tool to mould and improve the required mechanical properties as per the requirements. Eutectoid steel powder is selected as the reinforcement material since it is believed to be composed of lamellar pearlite with ferrite and cementite as alternate layers in as-cast condition, serving as micro-hybrid reinforcement to improve hardness and strength. In this work four different proportions of steel powder (2, wt.% 4 wt.% and 6 wt.%) reinforced composites are prepared by a two-stage stir casting process. Age-hardening treatment is given to the samples and analysed critically and compared with alloy matrix for different properties such as tensile strength, hardness and toughness. Results have shown significant improvement in the ultimate tensile strength and hardness of the composites after aging treatment. The 4 wt.% steel powder reinforced composite has shown better results compared to other composites.

scholarly journals Study of Mechanical Properties of Heat treated AL 7075/Graphite Powder/Baggasse Ash hybrid MMCs

2020 ◽  
pp. 203-211
Author(s):  
Meghashree K A ◽  
Puneeth P ◽  
Madhu M G ◽  
H K Shivananda
Keyword(s):  
Mechanical Properties ◽  
Compression Strength ◽  
Research Work ◽  
Testing Machine ◽  
Graphite Powder ◽  
Compression Tests ◽  
Standard Size ◽  
Casting Technique ◽  
Heat Treated ◽  
Al 7075

This research work investigated the influence of the graphite powder on the Mechanical behaviour of Aluminium 7075/Graphite Powder(Gr)/Bagasse Ash(BA) hybrid composite. This investigation reveals the effectiveness of incorporation of graphite powder in the composite for gaining enhancing mechanical properties. The Al7075 (Aluminium alloy 7075) reinforced with bagasse ash and graphite powder to form MMCs were investigated. The conventional liquid casting technique was used for the fabrication of the composite material and subject to T6 heat treatment. The composite was produced for different percentages of graphite powder and bagasse ash. The specimens were prepared as per ASTM standard size by turning and facing operations to conduct tensile tests, compression tests and hardness tests. The specimens for tensile and compression strength are tested using universal testing machine and for hardness they are tested using Brinell hardness testing machine. The reinforcement content was chosen as 2,4, 6wt.% of Graphite powder to identify its potential for self lubricating property under dry sliding conditions. Through the results, it is concluded that the MMC obtained has got better tensile strength, compression strength, yield strength and hardness properties when compared to non-heat-treated Al 7075 alone.

scholarly journals Development and Characterization of Al7475/NbC Reniforced Metal Matrix Composites

2020 ◽  
pp. 206-207
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Metal Matrix Composites ◽  
Compression Strength ◽  
Metal Matrix ◽  
High Strength ◽  
Stir Casting ◽  
Matrix Composites ◽  
Alloy Matrix ◽  
Thermal And Electrical Properties

Aluminium metal matrix composites (AMMCs) have considerable applications in aerospace, automotive and military industries due to their high strength to wear ratio, stiffness, light weight, good wear resistance and improved thermal and electrical properties. Ceramic particles such as Al2O3, SiC are the most widely used materials for reinforcement of aluminium. In the present work, an effort is made to enhance the mechanical properties like tensile strength, compression strength and hardness of AMMCs by reinforcing AL7475 matrix with varying NBC particles sizes. By stir casting route (liquid metallurgical technique) in which amount of reinforcement is varied from 2-8 wt% in steps of 2 wt% for varying reinforcement sizes and specimens are artificially aged. The prepared composites of AL7475-Boron Carbide (NBC) are characterized by microstructural studies, SEM and XRD/EDS analysis will be carried out to analyze the microstructure and the dispersion of the reinforced particles in the alloy matrix, mechanical properties such as Tensile strength, Compression Strength, Density, Tribological Properties and Fracture Toughness as per ASTM Standards. Hypothesis of the present work in particularly to the optimum size of reinforcement and also the results of both with and without heat treatment are compared with that of as cast AL7475 Alloy.

scholarly journals Processing and Property Evaluation of Nano Al2O3 Reinforced Copper- 5% Tin Composites for Bearing Applications

2019 ◽  
Vol 8 (2S8) ◽  
pp. 1027-1032
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Yield Strength ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Copper Matrix ◽  
Matrix Composites ◽  
Wear Properties ◽  
Casting Technique ◽  
Tin Metal

Nano technology has fascinated the attention of numerous material scientists and design engineers. The nano scaled particulates incorporation exhibit many attractive and special properties. The inclusion of nano particulates into the copper matrix might augments the hardness, ultimate tensile strength and yield strength significantly increases, maintaining the ductility. In this paper, the nano Al2O3 reinforced copper - 5%tin- metal matrix composites were manufactured by stir casting technique and reinforcement is varied from 0wt. % to 9wt. % in ventures of 3wt. %. The nano composites are characterized in terms of their mechanical and wear properties. Results revealed that, the distribution of nano Al2O3 particulates is fairly uniform in copper - 5%tin metal matrix. As the level of reinforcement increases, hardness, yield strength, ultimate tensile strength, and wear resistance of the copper - 5%tin – nano Al2O3 metal matrix composites increases. The developed nano metal matrix composites may be an alternative material for bearing applications

Phase, microstructure and tensile strength of Al–Al2O3–C hybrid metal matrix composites

2020 ◽  
Vol 234 (13) ◽  
pp. 2681-2693 ◽  
Author(s):  
Naseem Ahamad ◽  
Aas Mohammad ◽  
Kishor Kumar Sadasivuni ◽  
Pallav Gupta
Keyword(s):  
Tensile Strength ◽  
Impact Strength ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Intermediate Phase ◽  
Stir Casting ◽  
Aluminium Matrix ◽  
Equal Proportion ◽  
Matrix Composites ◽  
Hybrid Metal Matrix Composites

The aim of the present study is to investigate the effect of alumina (Al2O3)–carbon (C) reinforcement on the properties of aluminium matrix. Aluminium matrix reinforced with Al2O3–carbon (2.5, 5, 7.5 and 10 wt.%) in equal proportion was prepared by stir casting. Phase, microstructure, EDS, density, hardness, impact strength and tensile strength of prepared samples have been investigated. X-ray diffraction reports the intermediate phase formation between the matrix and reinforcement phase due to interfacial bonding between them. Scanning electron microscopy shows that Al matrix has uniform distribution of reinforcement particles, i.e. Al2O3 and carbon. Density decreases due to variation of reinforcement because ceramic reinforcement has low density. Hardness decreases due to variation of carbon since it has soft nature. Impact strength was found to increase with addition of reinforcement. Hybrid composite of Al and 5% Al2O3 + 5% carbon reinforcement has maximum engineering and true ultimate tensile strength. It is expected that the present hybrid metal matrix composites will be useful for fabricating stock screws.

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