Development Of Aluminum Matrix Composites Research Articles

Development of aluminum matrix composites through accumulative roll bonding: a review

Development of aluminum matrix composites through accumulative roll bonding: a review

Analysis of the morphological and mechanical characterization of aluminium matrix composite reinforced with chitosan

Recent studies acknowledge that convectional ceramic particulate could be replaced by several agricultural by-products in the development of aluminium matrix composites because of its selected for their low cost and relative ubiquity. This study explores the development of aluminium matrix composite from AA6061 alloy reinforced with chitosan particulates at weight proportions (3, 6, 9, and 12 wt%). The study further characterizes the developed composites using Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), X-ray Diffractometer (XRD), hardness, tensile and thermal and electrical conductivity test techniques. Results indicated that increasing chitosan content up to 10 wt% enhanced the hardness performance, while tensile strength of the composites increased sporadically, as SEM images observed reinforcement links embedded in grain boundaries. However, the thermal and electrical conductivity diminished due to the addition of chitosan particulates to the alloy matrix. The overall study showed the great potential of chitosan polymer as reinforcement to aluminium alloy.

Synergistic enhancement of strength and plasticity of SiCp/Al composites by designing and controlling SiCp@MgAl2O4 core-shell micro-interfaces

Building a superior balance of strength and plasticity inversion is a challenge in the development of aluminum matrix composites reinforced with medium volume fraction SiC particles. In this study, we reported an interface design strategy to simultaneously enhance the strength and plasticity of 30 vol% SiCp/Al composite by in-situ generating SiC@MgAl2O4 core-shell micro-nanostructures. The results showed that a uniform MgAl2O4 shell layer with a thickness of ∼300 nm was formed when the Mg content was 4.0 wt%. The MgAl2O4 shell layer formed abundant coherent interfaces with both SiC particles and aluminum alloy matrix, exhibiting powerful interfacial bonding strength. During the deformation process, the effective transmission of load and the delay of fracture achieved a synergistic improvement in both strength and plasticity.

Electrochemical investigation of the corrosion susceptibility of hybrid reinforced Al6063 with SiC and PKSA in 1.0 M sulfuric acid environment

AbstractThe recycling of agro‐waste as complementary reinforcements has received significant recognition in the development of aluminium matrix composites. Hence, this study examines the corrosion behavior of Al6063 reinforced with hybrid SiC/PKSA (palm kernel shell ash) particles. Through various ratios of SiC and PKSA particles in Al6063 alloy, composites were fabricated by double stir casting. Samples were cut and metallographically prepared for 1 M H2SO4 solution corrosion experiments. Gravimetric, potentiodynamic polarization and electrochemical impedance spectroscopic analyses were employed. The composites corroded initially at relatively high rates, gradually declining during long immersion times in the acidic solution. The intersection of reinforcements at the general surfaces of the composites where flawed oxide skins predominate acted as active sites for corrosion initiation. From potentiodynamic polarization studies, the corrosion currents increased with time for all specimens, with A9 being 1075.65 μA/cm2 at 72 h as against 857.99 μA/cm2 at 24 h of measurement. The corrosion potentials for all the specimens hovered around −654.00 to −647.22 mV. Bode plots revealed similar electrochemical reactions over all the substrates' surfaces. The relative corrosion resistance by the specimen depends on the oxide films' nature as the cathodic interfacial reinforcements dropped off into the acidic environment.

Applicability of Agro-Waste Materials in the Development of Aluminium Matrix Composites for Transport Structures

Applicability of Agro-Waste Materials in the Development of Aluminium Matrix Composites for Transport Structures

Effects of milling time on the structural and morphological features of Si-Based refractory compounds derived from selected Agro-Wastes

The effects of milling time on the structural and morphological features of Si-based refractory compounds (SBRC) derived from selected agro-wastes (bamboo leaves- BL and coconut shell-CS) are reported. The processing of the SBRC was done using the controlled environment of a conventional furnace at a heating rate of 10°/min between 900 and 1650 °C. The SBRC was then placed in 250 ml vial containing zirconia balls as grinding media of 8 mm in diameter to mill in an argon atmosphere (ultra-pure with 99.98% wt, < 3 ppm O2) using a planetary mill, Retsch, with a speed of 300 rpm. A ball-to-powder ratio (BPR) of 10:1 with 3 wt% of ethanol as process control agent (PCA) were used. The optimum milling time used was 25 h at a variation of 5 h. The morphological features were examined using a scanning electron microscope (SEM/EDX) and X-ray diffraction (XRD). The SEM results revealed a good dispersion of SBRC in the network of the BL and CS respectively. SiC precipitating as moissanite phase being a polytype of SiC with cubic structure was revealed from the XRD spectrum for BL sample. Also, other intermetallic phases were evident from all the samples under different milling time. It is evident that size grows with milling time due to high plastic deformation. It was observed that the milling time influenced, to a significant extent, the dislocation density. The attainment of a nanometer scale particle sizes was achieved using this method. The SBRC shows a good potential as nano-reinforcement materials for the development of aluminium matrix composites.

Review and Outlook of Aluminum Matrix Composites

In the past 20 years, the development of aluminum matrix composites (AMCs) has made a qualitative leap. This article comprehensively introduces the performance characteristics and the preparation methods of aluminum matrix composites. The powder metallurgy method (P/M) is elaborated in detail. And the applications of aluminum matrix composites in aerospace, automobile and other fields are described. Finally, the future development of aluminum matrix composites is prospected.

Effect of Reinforcement Material on Properties of Manufactured Aluminum Matrix Composite Using Stir Casting Route

Composite is a lightweight material that used and developed in various industries. The use of aluminum matrix composites as structural and automotive materials has increased in recent years. One of the obstacles in the development of aluminum matrix composites is high-cost production, especially raw material for reinforcing particles. One innovation is the use of natural materials and waste as reinforcement in aluminum matrix composites. Sea sand is one of the natural materials containing ceramic or oxide compounds so that it has the potential to be used as reinforcement in aluminum matrix composites. This paper compares the physical and mechanical properties of aluminum composite production using sea sand particles and composites with commonly used ceramic particle reinforcement, such as alumina and SiC. Calculation of density and porosity shows that Al6061/sea sand composites have higher density and lower porosity compared to Al6061/Al2O3 and Al6061/SiC composites. The hardness of Al6061/sea sand composite is higher compared to Al6061/Al2O3 and Al6061/SiC composites.

A Nanoindentation Study on Al (TiFe-Mg-SiC) Composites Fabricated via Stir Casting

The limitations of aluminium in most engineering applications has led to the development of aluminium matrix composites with improved microstructural and mechanical properties. Nanoindentation techniques was used in assessing the mechanical properties of fabricated aluminium matrix composites with ferrotitanium and silicon carbide as reinforcements. Results from nanoindentation experiments shows the dependence of modulus of elasticity, microhardness and contact depth on the dispersion of ferrotitanium and silicon carbide reinforcements within the aluminium matrix. Highest nanohardness value was observed in composite with 7 wt. % silicon carbide, while the lowest elastic modulus was recorded in as-cast aluminium. Further analysis of specimens confirmed a decrease in maximum penetration depth with respective increase in the addition of silicon carbide reinforcements in the fabricated composites.

Production of hybrid reinforcement by ball milling for development of aluminium matrix composites

PurposeThis paper aims to produce hybrid reinforcement for the development of aluminium matrix composites using ball-billing technique to avoid or reduce the problem of agglomeration of the reinforcement during casting.Design/methodology/approachIn the present investigation, a mixture of silicon carbide (SiC) and rice husk ash (RHA) powder in equal weight percentage ratio 4:4 (1:1) was alloyed mechanically in a ball-mill at distinct milling times of 15, 30, 45, 60 and 75 h. Morphological Characterization and density measurements of the ball-milled powder were carried out after different intervals of milling times.FindingsThe results revealed that the process of ball milling is a novel technique for the conversion of two or more powders in to an integer powder and reduces the problem of agglomeration also. The density measurement results revealed that an increasing trend of density initially and reduction of the density with the increase of milling time. The density value of the combined particles became comparable to the density of aluminium at the milling time of 75 h for the equal weight percentage ratio 4:4 (1:1) of SiC and RHA.Originality/valueThe manuscript highlights the research work related to the development of the reinforcement for the aluminium hybrid composites by ball milling process. The use of this process for the development of the reinforcement not only reduces the problem of the agglomeration but reduces the density mismatch of the reinforcement and matrix material also.

Experimental investigation of AA6061-Al2O3-fly ash composite produced by using stir casting method

Today’s composite research has been focused on developing lighter and cheaper materials. Out of many available ceramic reinforcements, fly-ash has been used as a cheaper reinforcement available in abundant quantity. Use of fly-ash will be helpful in reducing the cost of metal composite and weight also. Use of fly-ash as particle reinforcement will utilize a large amount of a waste material. The present work deals with the development of Aluminium Matrix composites using aluminium alloy AA6061 as matrix, Al2O3 and fly ash as reinforcing material; fabricated by stir casting technique. The effects on properties of these materials investigated by adding fly ash. This investigation shows that with the addition of fly ash Micro hardness, Rockwell hardness increases however density decreases. The microstructures of specimen of composites also have studied by optical microscopy. The microstructure reveals the fairly uniform distribution of reinforcement particles in the aluminium 6061 matrix.

Synthesis and Study of Microstructure and Mechanical Properties of Cast Al1100 (Mg) - SiC Composites

Metal matrix composites (MMCs) is a innovative engineering materials in which a tough reinforcement is included into a metal matrix to improve its properties. MMCs are used for weight critical applications like aircraft engines and in the automotive industries. Among the various types of MMCs, particulate-reinforced composites are the most versatile and economical one. SiC particulate can be considered as ideal reinforcements due to their high strength, high aspect ratio and thermo-mechanical properties. The development of aluminium matrix composites is receiving considerable emphasis in meeting the requirements of various industries. The objective of this work is to reinforce Al 1100-Mg alloy with different wt% of SiC (0, 3, 6, 9 and 12) was added by melt stirring method for the same alloy and composites. Microstructural Studies using Scanning Electron Microscopy (SEM) and Mechanical property like hardness and tensile properties have been investigated for cast base alloy and composites.

Enhanced tensile, hardness and wear behaviors of pure aluminum matrix reinforced with steel chips via powder metallurgy technique

The mechanical properties and wear behavior of aluminum matrix reinforced with steel machining chips was investigated. Pure aluminum was reinforced with 5, 7.5, and 10 wt% steel chips with an average size of 100 μm using powder metallurgy technique. Aluminum reinforced with 5 and 10 Wt.% SiC particles were manufactured for comparison. The investigation showed clear evidence that the addition of steel machining chips resulted in significantly low porosity levels in the aluminum matrix composites compared with the use of SiC as reinforcement. The mechanical properties (tensile and hardness) as well as the wear resistance were also observed to improve with the use of the steel machining chips as reinforcement. The results demonstrate the capability of steel machining chips to act as efficient reinforcing material and a reliable cost effective candidate in the development of aluminum matrix composites.

Development of aluminium matrix composites with non-agglomerated nanodiamond reinforcements

The mechanical alloying of 'aluminium+nanodiamond' mixtures for more than 8 h leads to the formation of aluminium carbide. To avoid this, the break-up of primary agglomerates should be performed during the production of a non-carbide-forming copper matrix composite (in the event that this metal is included in the required aluminium alloy), which is then followed by processing with aluminium. As a result, the time of processing a composite containing aluminium is reduced by 5-7 times, and the formation of aluminium carbide is prevented.

Development of aluminum matrix composites for neutron absorbing material

Development of aluminum matrix composites for neutron absorbing material