Effect of microwave sintering on the microstructure and mechanical properties of AA7075/B4C/ZrC hybrid nano composite fabricated by powder metallurgy techniques

Manohar, Guttikonda; Pandey, Krishna Murari; Maity, Saikat Ranjan

doi:10.1016/j.ceramint.2021.08.156

Cited by 51 publications

(16 citation statements)

References 47 publications

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“…Over lubricant, conditions can cause cracks in the sintering product. In addition, the nonuniform distribution of reinforcing particles in the matrix tends to experience agglomeration formation due to differences in particle thermal coefficients that trigger the formation of micro-pores [19]. Figure 6 displays the post-sintering composite porosity levels.…”

Section: Relative Density and Porosity Analysismentioning

confidence: 99%

“…The constituent particles can be identified, and dark gray is Al, light gray is Cu, Mg is white, graphite is black, while pores can be identified by black gradations. Figure 10a shows the tendency for the agglomeration of the copper reinforcing particles to be caused by the non-uniformity of the mixture, the difference in thermal coefficients, and the hightemperature sintering treatment with a long duration [19]. Micropores are also seen that are formed but have been filled with graphite particles.…”

Section: Sem and Eds Quantitative Analysismentioning

confidence: 99%

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Effect of Graphite Addition on Aluminum Hybrid Matrix Composite by Powder Metallurgy Method

Syahid¹,

Hayat²,

Aswar³

2022

RCMA

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The requirement for optimal strength and lightweight materials is a challenge in today's automotive industry. In this study, the synthesis of aluminum matrix hybrid composites containing magnesium and copper with the addition of graphite 0, 1, 3, and 5% by volume was carried out using powder metallurgy techniques and investigated the effect of the treatment given. The investigation of composite properties was carried out by testing density, porosity, hardness, wear rate, XRD, and SEM investigations integrated with EDS. Optimal conditions indicated composite with a content of 5% volume of graphite with the lowest porosity level of 5.10%, the relative density of 88.67%, and the highest hardness at 50.37 HV, followed by superior wear resistance. This result is supported by observing secondary phase formation and microstructure through XRD and SEM-EDS. The addition of graphite in the composite supports optimizing physical and mechanical properties as a lightweight composite. It deserves to be considered as an alternative material for automotive components.

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Section: Relative Density and Porosity Analysismentioning

confidence: 99%

Section: Sem and Eds Quantitative Analysismentioning

confidence: 99%

Effect of Graphite Addition on Aluminum Hybrid Matrix Composite by Powder Metallurgy Method

Syahid¹,

Hayat²,

Aswar³

2022

RCMA

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“…Microwave sintering was performed at three sintering temperatures i.e., 400, 450, 500, 550°C at a heating rate of 10°C/min for 30 min, SiC susceptor was used for preheating the samples up to its critical temperatures (T c ) in order to couple the microwaves with Aluminium matrix material (microwave re ector) for internal heat generation [30,32,36], and alumina insulation was used to prevent heat loses.…”

Section: Cold Compaction and Sinteringmentioning

confidence: 99%

“…The cold compacts were placed at centre of cavity, and sintering was performed at the multimode cavity [10,28,29,36]. Figure 2 represents the dimensions of composite samples for mechanical tests after sintering and machining operations.…”

Section: Cold Compaction and Sinteringmentioning

confidence: 99%

Effect of Variations in Microwave Processing Temperatures on Microstructural and Mechanical Properties of AA7075/SiC/Graphite Hybrid Composite Fabricated by Powder Metallurgy Techniques

Manohar¹,

Pandey

Maity

2022

Silicon

Self Cite

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Due to the demand in present industrial, aerospace, defense sectors for lightweight high-performance aluminum (Al) particle-reinforced metal matrix composites, the advancement of techniques to fabricate these composites with superior mechanical properties have gained technological interest in the modern world. In this direction, SiC and graphite reinforced AA7075 matrix composite material has been fabricated in this study, through hybrid microwave sintering techniques. The microwave sintering temperatures for the optimized volume fraction composition of AA7075/SiC/graphite hybrid composite has been varied from 400 to 550 ℃ with a step value of 50 ℃. The obtained results showed a superior improvement in the mechanical properties for microwave sintered composites as compared to the conventionally sintered composites. Mechanical properties are found to show increasing trend with increasing microwave sintering temperatures up to 500 ℃, after that, a downfall is observed in their mechanical properties, which can be attributed to the increased average grain size of the composite at 550 ℃. Selection of SiC as primary reinforcement material helped in achieving high mechanical strengths, and through microwave sintering, an increment of 37.2% in tensile, 26.6% in compression, and 16.5% in hardness is achieved. From this investigation, it is also observed that the selection of materials that shows high response to microwaves helps in achieving the enhanced mechanical properties for the hybrid composites processed by microwave sintering techniques.

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“…The joining of the Ti 2 AlC to itself or to metals, as well as dissimilar materials, will enable the production and assembly of components with complex shapes and will also improve the capabilities and properties of such materials. For example, heat sink components, automotive commutators, and electric locomotive pantograph pans require the joining of C-based materials (such as graphite) with Cu [18][19][20]. Compared with C-based materials, Ti 2 AlC has greater strength, better high-temperature stability, self-lubrication capability, and better conductivity [21].…”

Section: Introductionmentioning

confidence: 99%

An Investigation of Atomic Interaction between Ag and Ti2AlC under the Processing Temperature of 1080 °C

Wang

Chen

et al. 2021

Metals

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Ti2AlC is a typical MAX (M: early transition metal, A: main group element, and X: carbon and/or nitrogen) phase with ceramic and metallic properties due to its unique nano-layered structure. In order to investigate the interaction behavior between Ag and Ti2AlC, a sessile drop experiment was conducted at 1080 °C for 5 min. The atomic rearrangement occurred at the Ag–Ti2AlC interface was revealed using high-angle annular dark-field scanning transmission electron microscopy coupled with high-resolution transmission electron microscopy analysis. The results show that Ag nanoclusters generally appeared in most of the Ag–Ti2AlC interaction regions thermally processed at 1080 °C. In addition, Ag can also substitute for Al and Ti atoms in the Ti2AlC, promoting local structural decomposition of the Ti2AlC and producing 4H–Ag with a hexagonal close-packed (hcp) structure. Additionally, Al atoms released from the Ti2AlC lattices can dissolve locally into the liquid Ag, particularly at the grain boundaries. When the loss concentration of Al exceeded the critical level, the Ti2AlC started to decompose and the residual Ti6C octahedrons and Al atoms recombined, giving rise to the production of anti-perovskite Ti3AlC with a cubic structure. Lastly, the discrepancy in substitution behavior of Ag in the Ti2AlC was compared when thermally processed at different temperatures (1030 °C and 1080 °C). This work contributes to the understanding of the intrinsic stability of Ti2AlC MAX ceramics under high-temperature treatment.

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Effect of microwave sintering on the microstructure and mechanical properties of AA7075/B4C/ZrC hybrid nano composite fabricated by powder metallurgy techniques

Cited by 51 publications

References 47 publications

Effect of Graphite Addition on Aluminum Hybrid Matrix Composite by Powder Metallurgy Method

Effect of Graphite Addition on Aluminum Hybrid Matrix Composite by Powder Metallurgy Method

Effect of Variations in Microwave Processing Temperatures on Microstructural and Mechanical Properties of AA7075/SiC/Graphite Hybrid Composite Fabricated by Powder Metallurgy Techniques

An Investigation of Atomic Interaction between Ag and Ti2AlC under the Processing Temperature of 1080 °C

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