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Composite plays an important role for the last two decades in the engineering world. A judicious combination of two or more materials produces a synergistic effect that cannot be obtained by other means. Composites can also be defined as a combination of two or more physically distinct phases whose combinations produce excellent properties that are different from those of their constituents. The final cast structure of components mainly depends on the suitable selection of processing parameters. The casting parameter should be controlled very accurately to achieve sound castings. Several processing parameters often influence the final properties of the product. Therefore obtaining, an excellent metal matrix composite by squeeze casting necessitates optimization of process parameters. However, the utmost influencing process parameters are die and melt temperature even though the applied pressure is considered to be important. Hence squeeze casting is adopted because of thermal limitation within the aluminum alloys. Although it is possible for copper alloys, cast iron, and steel can also be squeeze cast. In this investigations of 700,740,780 and 820 °C melting temperature of Aluminum Alloy AA6061 was carried out and its effects were studied. To investigate the microstructure stability and particle distribution after squeeze casting also to study the porosity reduction concerning process parameters which can investigate the improvements in mechanical properties. Further, to examine the outcome of melt temperature, die temperature, squeeze pressure of AA6061/SiCp Metal matrix composite. Wear rate analysis of AA-6061/SiC metal matrix composite involves evaluating the material's resistance to wear and determining the rate at which it experiences material loss during sliding or abrasive contact. Factors such as sliding velocity, load, and surface morphology are considered to assess wear performance. Electro Discharge Machining (EDM) of AA-6061/SiC Metal Matrix Composite involves using electrical discharges to remove material. EDM is effective for machining complex shapes and hardened materials, but care must be taken to control the process parameters to minimize damage to the SiC particles and ensure dimensional accuracy. [ABSTRACT FROM AUTHOR]

Composite plays an important role for the last two decades in the engineering world. A judicious combination of two or more materials produces a synergistic effect that cannot be obtained by other means. Composites can also be defined as a combination of two or more physically distinct phases whose combinations produce excellent properties that are different from those of their constituents. The final cast structure of components mainly depends on the suitable selection of processing parameters. The casting parameter should be controlled very accurately to achieve sound castings. Several processing parameters often influence the final properties of the product. Therefore obtaining, an excellent metal matrix composite by squeeze casting necessitates optimization of process parameters. However, the utmost influencing process parameters are die and melt temperature even though the applied pressure is considered to be important. Hence squeeze casting is adopted because of thermal limitation within the aluminum alloys. Although it is possible for copper alloys, cast iron, and steel can also be squeeze cast. In this investigations of 700,740,780 and 820 °C melting temperature of Aluminum Alloy AA6061 was carried out and its effects were studied. To investigate the microstructure stability and particle distribution after squeeze casting also to study the porosity reduction concerning process parameters which can investigate the improvements in mechanical properties. Further, to examine the outcome of melt temperature, die temperature, squeeze pressure of AA6061/SiCp Metal matrix composite. Wear rate analysis of AA-6061/SiC metal matrix composite involves evaluating the material's resistance to wear and determining the rate at which it experiences material loss during sliding or abrasive contact. Factors such as sliding velocity, load, and surface morphology are considered to assess wear performance. Electro Discharge Machining (EDM) of AA-6061/SiC Metal Matrix Composite involves using electrical discharges to remove material. EDM is effective for machining complex shapes and hardened materials, but care must be taken to control the process parameters to minimize damage to the SiC particles and ensure dimensional accuracy. [ABSTRACT FROM AUTHOR]

The study explores the development of novel composites using nano-based hybrid reinforcements to enhance mechanical and wear properties. Specifically, A356 aluminum matrix composites containing a combination of silicon carbide particles (SiCp) and multi-walled carbon nanotubes (MWCNTs) were prepared using the Rotary and Squeeze casting methods. The research aimed to investigate the mechanical properties and microstructure of A356 alloy with varying percentages (5%, 10%, and 15%) of SiC-MWCNT hybrid reinforcements added at a 2:1 ratio. The results indicated that the squeeze casting method led to refined silicon and intermetallic compounds in the microstructure, and the dispersion of SiCp in the A356 alloy was homogeneous. Grain refinement was achieved, with a notable 35.22% improvement compared to the A356 alloy without reinforcements. The addition of SiCp, intermetallics, and Si particles increased tensile and yield strength. The study also observed a reduction in Si phase and α-Al grains with increased squeeze cast parameters. Furthermore, the aspect ratio and mean diameter of Si needles decreased by 31% and 43%, respectively, compared to the base alloy. After the squeeze casting process, improvements in yield strength (17.99%), tensile strength (36.66%), and percentage of elongation (195.91%) were noted compared to the composite prepared by rotary centrifugal casting methods. Lastly, the study evaluated the machinability of the hybrid MMC through an optimization technique, Entropy-PROMETHEE (Entp-PRMT). Overall, the research demonstrates the potential of nano-based hybrid reinforcements and the squeeze casting method to enhance the mechanical properties and microstructure of A356 aluminum matrix composites, offering promising applications in various industries. [ABSTRACT FROM AUTHOR]

SiC and TiB2 particle reinforced Al7075 matrix composite has numerous applications such as aircraft structures, mould tool manufacturing, and structural application due to less weight to strength ratio, low wear rate and high creeping behaviour. This paper deals with the various effect of the physical properties, mechanical properties, microstructure evaluation, and wear resistance of SiC, and TiB2 particulates reinforced Al7075 matrix composite fabricated by stir casting. XRD revealed the proper dispersion of SiC and TiB2 reinforcement throughout the aluminium matrix without the formation of an intermetallic compound. Ultimate tensile strength (UTS) and microhardness of aluminium matrix composite developed its strength and hardness from 140 MPa to 198 MPa and 66 HV to 86 HV respectively with the incorporation of SiC and TiB2 reinforcement. As compared to unreinforced aluminium matrix 7075, the ultimate tensile strength of SiC and TiB2 reinforced composite significantly developed due to better bonding and clear interface of reinforced particulates. Microstructure analyses that SiC and TiB2 contents homogeneously dispersed throughout the aluminium matrix. The unlubricated pin on disc tribotest was performed to determine the wear rate of casted aluminium matrix composite. The wear tests were performed at various loads (10, 20, 30 and 40 N), sliding velocity (1.25, 2.5, 3.75 and 5 m/s) and covering distance (1000, 2000, 3000 and 4000 m) which rotates against counter plate EN31 steel disc. [ABSTRACT FROM AUTHOR]

Aluminium matrix composites are scientifically engineered materials possessing higher potential in automotive, aerospace and defence applications. Therefore this study focuses on the fabrication of aluminium matrix composites reinforced with micro SiC particulates by stir casting process and investigating the effect of SiC content on mechanical properties as well as wear behaviour of the prepared composites. Different weight percentages (wt.%) of silicon carbide particulates (0, 3, 6 and 9%) were used. Stirring speed, time and other parameters were kept constant during the casting process. Microstructural characterization, tensile, hardness and wear tests were carried out of the casted samples. XRD analysis depicted the existence of SiC particulates in the prepared composites. Microstructural analysis confirms even distribution of reinforcement particulates. The experimental results revealed that, strength and hardness of the prepared composites improved with SiC addition. Wear resistance of SiC reinforced composites were also higher than that of the matrix alloy. The wear mechanism of matrix alloy was adhesive, whereas the wear mechanism changed to abrasive in case of SiC reinforced composites. The prepared composites exhibit augmented mechanical and tribological properties and can be used as a promising material in applications such as gears, drive shafts, brake drums and bearings. [ABSTRACT FROM AUTHOR]

Application of reinforced composite material enhanced in recent days compared to earlier conventional material due to its specific strength, high hardness, less weight, and better wear performance capacity. This paper deals with the wear resistance behaviour of different weight percentages of SiC particles dispersed aluminium matrix composites fabricated by stir casting. Scanning Electron Microscope (SEM) analysis revealed that uniform distribution of SiC particulates throughout the aluminium matrix. Wear analysis of formed composite was evaluated by using Taguchi L16 orthogonal array to minimize the total number of experimental runs. In order to obtain an efficient wear rate, four major factors such as reinforcement quantity (3, 5, 7 and 9%), applied load (10, 20, 30 and 40 N), sliding velocity (0.5, 1, 1.5 and 2 m/s) and sliding distance (500, 1000, 1500 and 2000 m) were varied four various levels. Analysis of Variance (ANOVA) result revealed that the probability value of the applied load was lesser than 0.05 that expressed the factor of significance. In this work, maximum Grey Relational Grade (GRG) and Grey Fuzzy Grade (GFG) results are observed 0.798 and 0.772 respectively to optimized factors of 9 wt.% SiC reinforcement, 10 N applied load, 2 m/s sliding velocity and 500 m sliding distance. It is concluded that the grey-fuzzy approach significantly strengthens the decision making of tribological behaviour instead of a simple grey relational grade. [ABSTRACT FROM AUTHOR]

Aluminium matrix composites impact greatly in modern trends for huge applications in the aerospace and automotive industry due to its better strength to weight ratio and temperature resistance capacity. This work investigated the effect on SiC and TiB2 powder reinforced aluminium matrix composite fabricated by stir casting. Stir casting is a widely used liquid state method of a fabrication technique for preparing metal matrix composite with the help of mechanical stirring. Density, tensile strength, hardness, and fracture analysis were done to observe the development of ceramic particle reinforced aluminium matrix composite. SEM analysis revealed the uniform distribution of reinforcement particles throughout the aluminium matrix. Universal tensile strength and micro hardness of aluminium matrix composite enhanced from 140 MPa to 182 MPa and 66 HV to 81 HV respectively due to the addition of particle reinforcement. The microstructural investigation from the fractured surface of tensile samples indicated ductile nature appeared in Al7075, Al7075/SiC, and Al7075/TiB2 composites due to nucleation and micro-voids formation. [ABSTRACT FROM AUTHOR]