Solidification Processing of Metal-Matrix Composites

The mechanical behavior [i.e., stiffness, strength, and toughness (K IC )] of SiC Al-Si-Mg metal-ceramic composites (50:50 by volume) was studied at temperatures ranging from 25 to 500°C. The SiC phase was derived from wood precursors, which resulted in an interconnected anisotropic ceramic that constrained the pressure melt-infiltrated aluminum alloy. The composites were made using SiC derived from two woods (sapele and beech) and were studied in three orthogonal orientations. The mechanical properties and corresponding deformation micromechanisms were different in the longitudinal (LO) and transverse directions, but the influence of the precursor wood was small. The LO behavior was controlled by the rigid SiC preform and the load transfer from the metal to the ceramic. Moduli in this orientation were lower than the Halpin-Tsai predictions due to the nonlinear and nonparallel nature of the Al-filled pores. The LO K IC agreed with the Ashby model for the K IC contribution of ductile inclusions in a brittle ceramic.

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“…This results in grain refinement and a larger number of primary Si crystals per unit volume. 30 B. Flexural test data…”

Section: A Microstructurementioning

confidence: 99%

Mechanical properties of wood-derived silicon carbide aluminum-alloy composites as a function of temperature

et al. 2008

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“…An important example is infiltration, which is one of the main processes used to produce composite materials: in infiltration open pores of a reinforcement body (usually called a preform) are filled with a fluid material that will make the matrix of the composite once it has solidified [4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Infiltration is one of the main ways in which metal matrix composites (MMCs) are produced [4-11, 15, 18-20].…”

Section: Introductionmentioning

confidence: 99%

“…As a result, in infiltration and in porous media fluid flow more generally, wetting is measured not using a few scalar quantities (such as θ, σLV and an average pore size) but by means of continuous curves, which trace the evolution of the capillary pressure as the molten metal gradually invades the porous preform to be infiltrated. These curves are known as drainage/imbibition curves, and plot the volume fraction of pore space filled by the invading fluid (saturation, S) versus the pressure difference P between the fluid and the initial atmosphere in the pores [5,8,11,[22][23][24][25][26][27][28][29][30]. Drainage curves are measured when a non-wetting fluid invades the porous medium; imbibition curves on the other hand result when a wetting fluid gradually fills pores of the preform.…”

Section: Introductionmentioning

confidence: 99%

“…Various methods have nonetheless been developed to enable this [5,8,11,18,[22][23][24][25][26][31][32][33][34]. We use here an apparatus that tracks, dynamically and with high precision, the volume of metal that has entered a porous solid preform (as is practiced at room temperature in a mercury porosimeter) as a function of pressure and time, thus providing entire drainage curves characteristic of a given system in one, single, infiltration experiment [26,[31][32][33].…”

Section: Introductionmentioning

confidence: 99%

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Infiltration of tin bronze into alumina particle beds: influence of alloy chemistry on drainage curves

2014

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The wetting of angular alumina particle preforms by Cu-Sn alloys is investigated by means of pressure infiltration experiments conducted at 1150°C, using a system enabling dynamic and precise measurements of the metal volume injected into the preform. Wetting is quantified in terms of drainage curves, which plot the volume fraction of molten metal in the packed powder preform (also called saturation) versus the applied pressure. The shape of the curves confirms earlier findings, namely (i) the initial stage of infiltration is dominated by percolation and obeys a universal scaling relation while the metal shape is fractal and (ii) at higher saturation incremental pore-filling is dictated by local pore geometrical characteristics, saturation curves obeying then the Brooks-Corey correlation. According to sessile drop data in the literature, the Cu-Sn system is characterized by relatively small changes in the contact angle with alloy composition (128 to 122°), while the metal surface tension changes by more than a factor two over the whole composition range. One would therefore expect that the drainage curves be indifferently proportional to the molten metal surface tension or the work of immersion: the present data show that this is indeed verified.

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“…They have been recently reviewed [2,3] first, the molten metal processing which offers the widest range of variations. One of them is the standard squeeze casting method: molten metal is squeezed into a preform composed of an agglomeration of short fibres using a hydraulic press; secondly, the powder processing (PM) involving densification and shaping of mixtures of the matrix alloy and the reinforcing phase into a powder and then to consolidate them after mixing.…”

Section: Introductionmentioning

confidence: 99%

Microstructural characterization of metal matrix composites by analytical electron microscopy

Molins

Kihn

Sévely

et al. 1991

Microsc. Microanal. Microstruct.

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Solidification Processing of Metal-Matrix Composites

Cited by 71 publications

References 80 publications

Mechanical properties of wood-derived silicon carbide aluminum-alloy composites as a function of temperature

Mechanical properties of wood-derived silicon carbide aluminum-alloy composites as a function of temperature

Infiltration of tin bronze into alumina particle beds: influence of alloy chemistry on drainage curves

Microstructural characterization of metal matrix composites by analytical electron microscopy

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