Microstructure and interface characteristics of B4C, SiC and Al2O3 reinforced Al matrix composites: a comparative study (original) (raw)
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Journal of materials …, 2003
Three aluminium metal matrix composites containing reinforcing particles of B 4 C, SiC and Al 2 O 3 (0-20 vol.%) were processed. The stir-casting manufacturing route followed by hot extrusion was utilized, being one of the cost-effective industrial methods. A clear interfacial reaction product/layer was found at Al-SiC interface for composites held for a relatively long processing time (>30 min). No reaction product was observed at Al-B 4 C and Al-Al 2 O 3 interfaces at the resolution limit of the SEM used. On the other hand, two secondary phases (alumina and another phase containing aluminium, boron and carbon) were found in the aluminum matrix away from the interface in Al-B 4 C composites. From the fracture surface analysis, B 4 C reinforced Al composite seemed to exhibit a better interfacial bonding compared to the other two composites. .bd (A.S.M.A. Haseeb).
Currently aluminum metal matrix composites (MMC) with particulate reinforcement and related manufacturing methods are among important research topics because of their low density, high specific stiffness, strength, and wear resistance. B 4 C p /Al composites are commonly used materials for fabrication of lightweight functional components. Different percentage amounts of B 4 C p (3wt%, 6wt%, and 9wt%) were added to the aluminum matrix and the composite materials were prepared at 823 °K under argon atmosphere. The X-ray diffraction (XRD) showed the formation of the phases such as Al, B 4 C and AlB 2 in B 4 C p /Al composites. The density of the composite materials decreased from 2.5773 to 2.5270 g/cm 3 with an increase in the amount of B 4 C p addition. The optimum properties (hardness and compressive strength) were obtained by reinforcement with smallest B 4 C particles (size 22 µm). The present work was concentrated on the feasibility of the fabrication of B 4 C p particulate reinforced aluminum MMCs by P/M technique.
Processing and mechanical properties of B4C reinforced Al matrix composites
Journal of Alloys and Compounds, 2009
Aluminum matrix composites are emerging as advance engineering materials due to its high specific strength and stiffness, good wear resistance and high temperature properties. Properties of Al reinforced with Al 2 O 3 and SiC are widely investigated. In the present study, mechanical properties of B 4 C reinforced Al matrix is investigated due to higher hardness and lower density properties than SiC and Al 2 O 3. The high temperature deformation behavior of 5, 10, 15 and 20 wt% B 4 C powder having an average particle diameter of about 10 m aluminum matrix composite sintered at 650 • C was investigated by creep tests at temperatures ranging from 400 to 450 • C and creep resistance of Al alloy is enhanced by the presence of B 4 C particles. Measurement of impact and hardness properties of composites showed that impact values decrease and hardness values increased with increase in weight fraction of reinforcement.
Materials Today: Proceedings, 2019
This paper reviews different experimental and theoretical studies related to B4C reinforced aluminum metal matrix composites (MMC). Various processes like solid sintering, powder processing through ball milling, and also various thermo-mechanical processing like heat treatment, quenching are discussed. The effects on the particle size of boron carbide (B4C) reinforcement on morphology evolution and microstructure are thoroughly studied. The strengthening mechanisms of B4C reinforced Al-MMC are thoroughly reviewed and the interfacial structure in between B4C and matrix material are discussed.
Aluminum Matrix Composites (AMCs) are emerging as advance engineering materials due to their strength, ductility and toughness. The aluminium matrix can be strengthened by reinforcing with hard ceramic particles like SiC,Al 2 O 3 , B 4 C etc.In this work The aim involved in designing metal matrix composite materials is to combine the desirable attributes of metals and Ceramics.Powder metallurgy is one of the established manufactured processes which allow products of complex geometries to be produced with tailor made properties like high strength and tolerances. P/M has replaced conventional metal forming operations due to added benefits like high material utilization, low energy consumption, less material wastage and reasonable cost, because of which it is extensively used in automobile, aerospace and many other industriesIn this work Al7075-Sic and Al6082-B 4 C metal matrix composites were fabricated using powder metallurgy technique Specimens were prepared by varying reinforcement...
Powder Metallurgy and Metal Ceramics, 2019
The conversion into the desired shape of the metal powders using Powder Metallurgy (PM) method enables economically mass productions. This case allows producing parts with complex and high dimensional accuracy with no machining. In this study the composites and hybrid composites with Al matrix were produced using PM method with different ratios B 4 C and SiC. Microhardness and wear experiments of the produced composites were investigated. Wear experiments were performed at a constant speed of 0.5 m/s, application loads of 5, 10 and 15 N and sliding distances of 250, 500, and 750 m. Then, SEM images of composites and hybrid composites were captured. The increase of the reinforcement ratio in the composites contributed to the increase of the hardness. The highest hardness value was computed as 58.7 HV from 16% B 4 C reinforced composite. In addition, the increase in the reinforcement ratio contributed to the increase of the wear resistance. The increase in the load and sliding distance also increased the wear. The minimum weight loss was calculated as 18 mg from 5 N load, 250 m sliding distance and 16% SiC reinforced composite.
The applications of metal matrix composites are increasing day by day due to high strength to weight ratio. In the present work Al—SiC—B 4 C metal matrix composite is prepared from sintering of mechanically alloyed powder (ball milling) in powder metallurgy processes. Three different combinations of compositions in volume fraction were chosen namely 90%Al 8%SiC 2%B 4 C, 90%Al 5%SiC 5%B 4 C and 90%Al 3%SiC 7%B 4 C. An attempt has been made to study the characteristics of developed metal matrix composite. As increase in percentage of B 4 C the micro hardness of the metal matrix composite has increased significantly. The microstructure of the prepared metal matrix composite reveals the uniform distribution of particles in metal matrix.
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2008
The microstructure and tensile properties of two particulate metal-matrix composites have been studied in the present work. The composite ingots were made by stir casting process which had similar matrices (A356 aluminium alloy) and different volume fraction of Al 2 O 3 and SiC particles (5, 10, 15 and 20 vol.%). It was found that increasing volume fraction of the reinforcing particles reduces tensile strength and ductility of the composites but, the addition of 4 wt.% Al-5Ti-1B to composites improves the tensile strength and elongation values to some extent. Microstructural observations and fractographic examination of the fractured faces of several cast MMCs showed that these materials basically suffer from microshrinkage pores which increase with the addition of ceramic reinforcements.
Perspectives in Science, 2016
The applications of metal matrix composites are increasing day by day due to high strength to weight ratio. In the present work Al-SiC-B 4 C metal matrix composite is prepared from sintering of mechanically alloyed powder (ball milling) in powder metallurgy processes. Three different combinations of compositions in volume fraction were chosen namely 90%Al 8%SiC 2%B 4 C, 90%Al 5%SiC 5%B 4 C and 90%Al 3%SiC 7%B 4 C. An attempt has been made to study the characteristics of developed metal matrix composite. As increase in percentage of B 4 C the micro hardness of the metal matrix composite has increased significantly. The microstructure of the prepared metal matrix composite reveals the uniform distribution of particles in metal matrix.
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.