Clustering-induced high magnetization in Co-doped TiO2

Journal of Composite Materials

et al. 2020

The present paper reports the effect of aluminium oxide and titanium oxide reinforcement on the properties of aluminium matrix. Aluminium matrix reinforced with aluminium oxide–titanium oxide (2.5, 5.0, 7.5 and 10 wt.%) in equal proportion were prepared by stir casting. Phase, microstructure, energy dispersive spectroscopy, 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 phases due to interfacial bonding between them. Scanning electron microscopy shows that aluminium matrix has uniform distribution of reinforcement particle i.e. aluminium oxide and titanium oxide. Density of composite decreases due to variation of reinforcement and it shows low density after preheating. Hardness decreases due to the amalgamation of reinforcements. Impact strength was found to increase with the addition of reinforcements. Hybrid composite of aluminium matrix and (5% aluminium oxide + 5% titanium oxide) reinforcements have maximum engineering and true ultimate tensile strength. It is expected that the present hybrid metal matrix composites will be useful for aircraft rivets.

Section: Resultsmentioning

confidence: 99%

Section: X-ray Diffractionmentioning

confidence: 99%

Structural and mechanical characterization of stir cast Al–Al₂O₃–TiO₂ hybrid metal matrix composites

Ahamad

Mohammad

Journal of Composite Materials

et al. 2020

“…Increased dislocations are introduced during composite processing due to variation in co-efficient of thermal expansion between matrix and reinforcement. 40–44 These reinforcement particles act as obstacles to the movement of dislocations under load. It may be noted that even dispersion of reinforcement helps in efficient load transfer from matrix material to reinforcement which results in enhanced strength of the composite.…”

Section: Discussionmentioning

confidence: 99%

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

Ahamad

Mohammad

Proceedings of the Institution of Mechanical Engineers, Part C:

et al. 2020

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.

“…Moreover hardness of the samples showed a decreasing trend with addition of reinforcements due to the soft texture and lubricating property of graphite. [26][27][28] The samples with lower or no graphite content (pure copper) were hard and showed a brittle fracture whilst the samples with higher graphite content were less hard and yielded more thereby exhibiting higher compressive strength. Figure 6 shows continuous rise in compressive strength from lower wt% of reinforcements in CAG001 to higher wt% of reinforcements in CAG004.…”

Section: Wearmentioning

confidence: 99%

“…19 The aforementioned attributes of the prepared material have been analysed in order to discern the abilities of the prepared material from the pure metal in achieving the desired properties. 20,[22][23][24][25][26][27][28][29][30][31][32][33] The aim of the present work is to study the effect of reinforcements content on phase, microstructure, density, hardness, wear, compressive strength and specific heat of the Cu-(Al 2 O 3 -C) composites. Copper matrix composites reinforced with Al 2 O 3 and graphite are widely used in structural and thermal applications.…”

Section: Introductionmentioning

confidence: 99%

Structural, wear and thermal behaviour of Cu–Al₂O₃–graphite hybrid metal matrix composites

Mittal

Paswan

Proceedings of the Institution of Mechanical Engineers, Part L:

et al. 2020

The aim of the present study is to investigate the structural, wear and thermal behaviour of Cu–Al2O3–graphite hybrid metal matrix composites. Copper matrix composites with Al2O3–graphite reinforcement (0.5-0.5, 1.0-1.0, 1.5-1.5 and 2.0-2.0 wt%) were prepared by stir casting process. Phase, microstructure, density, hardness, wear, compressive strength and specific heat of prepared samples have been investigated. X-ray diffraction revealed that there is no intermediate phase formation between matrix and reinforcement phase as a result of interfacial bonding between them. Microstructure study shows the uniform distribution of Al2O3–graphite particles in the Cu-matrix. Density and hardness were found to decrease with increase in reinforcements percentage whereas the compressive strength was found to increase as the amount of reinforcements was increased. Composite containing 2.0 wt% reinforcements showed the maximum resistance to wear. Specific heat was found to increase with addition of reinforcements; however, this increase was very marginal. Structural, wear and thermal properties of these Cu matrix-based hybrid metal matrix composites were found to be dependent on the reinforcements concentration. It is expected that the present composite will be useful for heat exchanger and heat sink applications.