Effect of Porosity on Tensile Properties of Cast Particle Reinforced MMC

Ahmad, Shafi; Hashim, J.; Ghazali, Mohd Imran

doi:10.1177/0021998306066720

Cited by 26 publications

(21 citation statements)

References 22 publications

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“…In view of the change of porosity amount present in different composite fabrication processes, e.g., 0.07–1.04 vol% [12], 0.25–1.15 vol% [14], 3–12 vol% [29], 0–1.18 vol% [34], up to 12.25 vol% [32], about 6 vol% [57], up to 13 vol% [33], and up to 12.45 vol% [58], three typical porosity values of 1 vol%, 3 vol%, and 5 vol% were selected in the present model calculation.…”

Section: Results and Model Validationmentioning

confidence: 99%

“…For example, the occurrence of porosity as discontinuities in cast MMC interrupted the balance between the reinforcing particles carrying the load, generated a stress concentration and facilitated the crack initiation and propagation, and thus reduced its mechanical properties [32]. Also, most fatigue cracks initiated from the discontinuities in materials, mainly in the highly stressed regions of components.…”

Section: Model Developmentmentioning

confidence: 99%

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A Unified Model for the Prediction of Yield Strength in Particulate-Reinforced Metal Matrix Nanocomposites

Mirza

Chen

2015

Materials

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Lightweighting in the transportation industry is today recognized as one of the most important strategies to improve fuel efficiency and reduce anthropogenic climate-changing, environment-damaging, and human death-causing emissions. However, the structural applications of lightweight alloys are often limited by some inherent deficiencies such as low stiffness, high wear rate and inferior strength. These properties could be effectively enhanced by the addition of stronger and stiffer reinforcements, especially nano-sized particles, into metal matrix to form composites. In most cases three common strengthening mechanisms (load-bearing effect, mismatch of coefficients of thermal expansion, and Orowan strengthening) have been considered to predict the yield strength of metal matrix nanocomposites (MMNCs). This study was aimed at developing a unified model by taking into account the matrix grain size and porosity (which is unavoidable in the materials processing such as casting and powder metallurgy) in the prediction of the yield strength of MMNCs. The Zener pinning effect of grain boundaries by the nano-sized particles has also been integrated. The model was validated using the experimental data of magnesium- and titanium-based nanocomposites containing different types of nano-sized particles (namely, Al2O3, Y2O3, and carbon nanotubes). The predicted results were observed to be in good agreement with the experimental data reported in the literature.

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Section: Results and Model Validationmentioning

confidence: 99%

Section: Model Developmentmentioning

confidence: 99%

A Unified Model for the Prediction of Yield Strength in Particulate-Reinforced Metal Matrix Nanocomposites

Mirza

Chen

2015

Materials

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“…Porosity causes ineffective distribution of reinforcement within the matrix alloy, and thus, reinforcement does not dominate the matrix alloy properties. Since pores are observed to create stress concentration, porosity overrules the reinforcement performance by developing a nonuniform stress field, which produces an ineffective reinforcing condition [149].…”

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confidence: 99%

Copper/graphene composites: a review

Hidalgo-Manrique

Lei²,

Xu³

et al. 2019

J Mater Sci

258

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Recent research upon the incorporation of graphene into copper matrix composites is reviewed in detail. An extensive account is given of the large number of processing methods that can be employed to prepare copper/graphene composites along with a description of the microstructures that may be produced. Processing routes that have been employed are described including powder methods, electrochemical processing, chemical vapour deposition, layer-by-layer processing, liquid metal infiltration among a number of others. The mechanical properties of the composites are described in detail along with an account of the structural factors that control mechanical behaviour. The mechanics and mechanisms of deformation are discussed, and the effect of factors such as the graphene content and the type of graphene used, along with processing conditions for the fabrication of the composites, is described. The functional properties of copper/graphene composites are also reviewed including their electrical and thermal properties, and tribological and corrosion behaviour. In each case, the effect of the graphene type and content, and processing conditions are also described. Finally, possible future applications of copper/graphene composites are discussed.

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“…There are some basic manufacturing methods for graded materials, which include powder metallurgy, physical vapor deposition (PVD), chemical vapor deposition (CVD), plasma spray, thermal spray, combustion synthesis (SHS), centrifugal casting, and polymerization [4,10,[12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. Recently developed methods are also available: modified stir casting, centrifugal sintering, gradient slurry disintegration and deposition, and powder cold spray before cold isostatic sintering [30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Crack Propagation Analysis of Aluminum Matrix Functionally Graded Material

Ulukoy¹,

Topçu²,

Taşgetiren³

2016

Advances in Functionally Graded Materials and Structures

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In this study, a functionally graded cylindrical specimen was obtained via centrifugal casting and its fatigue crack behavior was investigated. Aluminum alloy and SiC were used as matrix material and ceramic particle, respectively. The distribution of SiC and the mechanical properties of material through cylinder wall thickness were varied because of the centrifugal force during centrifugal casting. Variations in microstructure and hardness were examined. A cylindrical specimen was cut through its thickness in four sections through vertical slicing. Tensile strength was tested on each section to determine the mechanical properties that can be varied such as Young's modulus, tensile strength, and yielding stress. To investigate the effect of variation in the mechanical properties and distribution of SiC particles on fatigue crack behavior, fatigue crack growth tests were applied under tensile cyclic load with stress ratio R = . . The samples were prepared in three separate groups central notched, single-edge notched on SiC-rich side, and single-edge notched on aluminum-rich side. It was found that SiC distribution affected fatigue crack initiation and propagation. The fatigue life increased up to % because of increasing SiC ratio for central notched specimens. Cracks were started out later on the single-edge notched SiC-rich side compared to aluminum-rich side whose fatigue life increased up to %. In addition, it was found that unreinforced aluminum material's fatigue life was lower than that of reinforced material.

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Effect of Porosity on Tensile Properties of Cast Particle Reinforced MMC

Cited by 26 publications

References 22 publications

A Unified Model for the Prediction of Yield Strength in Particulate-Reinforced Metal Matrix Nanocomposites

A Unified Model for the Prediction of Yield Strength in Particulate-Reinforced Metal Matrix Nanocomposites

Copper/graphene composites: a review

An Experimental Crack Propagation Analysis of Aluminum Matrix Functionally Graded Material

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