Particle distribution in cast metal matrix composites—Part I

Hashim, J.; Looney, L.; Hashmi, M.S.J.

doi:10.1016/s0924-0136(02)00098-5

Cited by 419 publications

(179 citation statements)

References 26 publications

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“…Heat treatment expanded initial α-phase and provides a uniform structure which the carbon fibers, silicon particles and intermetallic compounds were surrounded by expanded alpha phase as matrix. As suggested by other authors, in aluminum alloys with Mg content (0.5-2%) improve the wettability of aluminum on carbon fiber [2,3]. Therefore, the localized high content of silicon and magnesium in the molten eutectic which was being sheared at semi-solid provides relatively strong adherence.…”

Section: Microstructure Evolution and Heat Treatmentmentioning

confidence: 68%

“…Conventional liquid stir casting and powder metallurgy are the main methods, but they are more costly and less effective for direct fabrication of aluminum carbon fiber composites. Low interfacial adherence and non-homogeneous distribution are the main challenges for the conventional metal composite manufacturing process [3]. Previous research on homogeneous distribution of reinforcement particles in an aluminum matrix have been attempted by milling of SiC p and aluminum powders and casting at semi-solid state to improve the wettability and distribution [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and properties of aluminum silicon/short fibre carbon composites fabricated by semi-solid thixomixing

2015

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A novel method was developed, based on thixotropic nature of semi-solid slurry of aluminum silicon alloy, for the effective dispersion and distribution of short carbon fibers (C sf ) under intensive shear stress (τ) into the eutectic without physical or chemical damage.The C sf were distributed homogeneously into the matrix at optimum conditions: a temperature of 576-580 °C, around 48% of solid fraction, and rotation speed of mixing was at 100 rpm. The gas entrapment and porosity was a challenge in the fabrication the aluminum composite by thixomixing, and its size increased when the samples were heat treated. The extruded and heat treated composites had around 24% improvement of mechanical strength as assessed by tensile tests. The predominant deposition of silicon and its intermetallics at the interfacial region improved the wettability and adherence to achieve good mechanical properties. The formation of some intermetallics can be helpful to overcome low wettability effects and their structural evolutions were impressive. The fractography analysis illustrated the ductile fracture with some plastic deformation as the results of dimples and some fiber pull-out in the fractured surface. Ultra-micro hardness evaluation showed good interfacial bonding after heat treatment. The thixomixing process can be developed to produce various composites with different reinforcement.

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Section: Microstructure Evolution and Heat Treatmentmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Microstructure and properties of aluminum silicon/short fibre carbon composites fabricated by semi-solid thixomixing

2015

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“…(1) 2012; 15 (6)porosities in high volume reinforcement may be benefit to reducing the effective thermal conductivity of Al-MgO composites.…”

Section: The Effect Of Rvr On Effective Thermal Conductivitymentioning

confidence: 99%

“…Furthermore, in MMCs production with melt stirring method, increased Reinforcement Volume Ratio (RVR) and decreased particle size resulted more difficult production process and increased porosity and particle agglomeration 3,4 . Many studies have been conducted on the distribution of reinforcement elements inside the composites and their effect on microstructure, porosity, hardness, abrasion behavior and rupture strength as well as the effect of stirring time and speed [5][6][7][8][9][10][11][12][13][14][15][16] . In this study, the effect of RVR on composite microstructure and thermal properties were examined in 5%, 10% and 15% MgO reinforced composites produced by melt stirring method.…”

Section: Introductionmentioning

confidence: 99%

The effect of reinforcement volume ratio on porosity and thermal conductivity in Al-Mgo composites

2012

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In this study, the effects of reinforcement volume ratios (RVR) on composite structure and thermal conductivity were examined in Al-MgO reinforced metal matrix composites (MMCs) of 5%, 10% and 15% RVR produced by melt stirring. In the production of composites, EN AW 1050A aluminum alloy was used as the matrix material and MgO powders with particle size of -105 µm were used as the reinforcement material. For every composite specimen was produced at 500 rev/min stirring speed, at 750 °C liquid matrix temperature and 4 minutes stirring time. Composite samples were cooled under normal atmosphere. Then, microstructures of the samples were determined and evaluated by using Scanning Electron Microscope (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) analysis. In general, it was observed that the reinforcement exhibited a homogeneous distribution. Furthermore, it was determined that the increase in the RVR increased porosity. From the Scanning Electron Microscope images, a thermal Ansys model was generated to determine effective thermal conductivity. Effective thermal conductivity of Al-MgO composites increased with the decrease in reinforcement volume ratio.

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“…On account of metal matrix composites (MMCs), the fatigue conduct varies from that of unreinforced metals in a few ways. On account of particle reinforced metals, various reviews have concentrated on understanding the impact of the strengthening molecule on the network microstructure and the relating impact on the fatigue conduct of the MMCs [4] [5] [6] [7] [8]. The size and weight percentage of the reinforcements are likewise influencing the fatigue life.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Behaviour of Silicon Carbide and Fly Ash Dispersion Strengthened High Performance Hybrid Al 5083 Metal Matrix Composites

Santhosh¹,

Kempaiah²,

Sajjan³

et al. 2017

JMMCE

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Fatigue is a major issue concerning the use of aluminium composites in structural applications. Fatigue leads to weakening of material majorly due to the strain bands formed in the material when it is subjected to repeated loading; the damage that occurs due to fatigue is a progressive and localized one. The fatigue may occur at a stress limit much lesser than the ultimate stress limit of the composite specimen. Henceforth in the current work, fatigue behaviour of silicon carbide and fly ash dispersion strengthened high performance hybrid Al 5083 metal matrix composites are evaluated. The main purpose of fatigue characterisation is to distinctly evaluate the life cycle of components that are fabricated from metal matrix composites and eventually develop a framework model for the significant study of fatigue strength of the structure with persistent striations all along the interstitials of aluminiumsilicon carbide-fly ash interfaces. Fatigue is a stochastic process rather than a deterministic one that gives a considerable scatter, even among samples of similar composition with the tests carried out in some of the critically controlled environments. Hence there is a need for statistical validation of the results to authenticate the data collected. Thus in the current work, analysis of variance is carried out to establish the authenticity of the results and validate them. The results and plots are presented with suitable rationale and inferences.

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Particle distribution in cast metal matrix composites—Part I

Cited by 419 publications

References 26 publications

Microstructure and properties of aluminum silicon/short fibre carbon composites fabricated by semi-solid thixomixing

Microstructure and properties of aluminum silicon/short fibre carbon composites fabricated by semi-solid thixomixing

The effect of reinforcement volume ratio on porosity and thermal conductivity in Al-Mgo composites

Fatigue Behaviour of Silicon Carbide and Fly Ash Dispersion Strengthened High Performance Hybrid Al 5083 Metal Matrix Composites

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