Segregation of silicon carbide by settling and particle pushing in cast aluminum-silicon-carbide particle composite

Rohatgi, Pradeep K.; Yarandi, F.; Liu, Y; Asthana, R.

doi:10.1016/0921-5093(91)90813-3

Cited by 37 publications

(11 citation statements)

References 14 publications

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“…Lloyd [30] observed a region devoid of particles near the chill during solidification of A356/SiC bottom-cooled systems, and attributed this phenomenon to pushing by an essentially planar interface in this region which could physically push the particles. Similar phenomena were observed by Rohatgi et al in solidification experiments utilizing A357/SiC [31,32] and A356/SiC [33] systems cooled from below, although particles were macroscopically pushed for nearly the entire length of the casting in the former case, but only very near the chill in the latter. Rohatgi et al also developed a one-dimensional heat-transfer model to investigate the effect of stationary particles on temperature profiles and interface velocities in a pure-substance matrix.…”

Section: Metal-matrix Particulate Composites (Mmpcs)supporting

confidence: 76%

Modeling of solidification of metal-matrix particulate composites with convection

Feller

Beckermann

1997

Metall Mater Trans B

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A multiphase model for the alloy solidification of metal-matrix particulate composites with convection is developed. Macroscopic transport equations are written for each phase, with unknown parameters modeled through supplementary relations pertinent to the solidification of a binary alloy matrix containing a stationary solid phase and generally nonstationary spherical particles. The model is applied to various one-and two-dimensional systems containing an Al-7 wt pct Si/SiC composite. One-dimensional sedimentation results in nonclustering and clustering particle systems show good agreement with experiments. One-dimensional composite solidification results illustrate the effect of particle clustering and cooling direction on the final macroscopic particle distribution. Two-dimensional results in various unreinforced and reinforced systems illustrate macroscopic particle segregation and its effect on buoyancy-driven melt convection and species macrosegregation. Results indicate a nearly uniform particle distribution for relatively small particles due to negligible particle settling prior to entrapment. For relatively large particles, significant particle settling prior to entrapment results in large denuded and packed zones in the casting. Fluid flow and macrosegregation during solidification are substantially reduced in the presence of particles, due to the relatively large interfacial drag exerted on the liquid by the stationary mush and particle phases.

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Section: Metal-matrix Particulate Composites (Mmpcs)supporting

confidence: 76%

Modeling of solidification of metal-matrix particulate composites with convection

Feller

Beckermann

1997

Metall Mater Trans B

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“…[5] The interfacial adhesion force is responsible for re-distribution of particles during solidification of composites. [90][91][92][93][94][95][96][97][98][99][100][101][102][103][104] There are three phases involved in this situation: a, b, and c. Vector x is chosen as the separation (distance between closest interfaces) of phases a and b. Phases a and b are considered rigid, that is, their interfacial areas are kept constant.…”

Section: The Interfacial Adhesion Forcementioning

confidence: 99%

Interfacial Forces in Dispersion Science and Technology

Kaptay

2012

Journal of Dispersion Science and Technology

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Interfacial forces determine many phenomena in dispersion science and technology. Eight types of interfacial forces are classified in this article. A general equation for all of them is derived here, with particular equation for each of them (being valid for simplified geometries, such as spheres, cylinders, etc.). As a new element, an interfacial anti-stretching force is introduced in this article, being equivalent to the definition of the interfacial energy in terms of tension as understood by Young. The differences and similarities between the interfacial gradient force and the interfacial spreading force (the Marangoni force) are shown. The well-known case of the liquid bridge induced interfacial force is supplemented by its less known version of a gaseous bridge induced interfacial force.

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“…Lloyd (1989) experimented on Al-SiC composites and shown that the Al-Si casting alloys have low reactivity with SiC. Segregation of silicon carbide particles by settling and particle pushing in cast Al 357-15 vol% SiC p composites under various solidification conditions was studied by Rohatgi et al (1991). They concluded that the best distribution of particles was obtained under fast cooling rate during multidirectional cooling.…”

Section: Introductionmentioning

confidence: 96%

Prediction of cooling curves during solidification of Al 6061–SiCp based metal matrix composites using finite element analysis

Jagadeesh¹,

Ramesh

Mallikarjuna

et al. 2010

Journal of Materials Processing Technology

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Segregation of silicon carbide by settling and particle pushing in cast aluminum-silicon-carbide particle composite

Cited by 37 publications

References 14 publications

Modeling of solidification of metal-matrix particulate composites with convection

Modeling of solidification of metal-matrix particulate composites with convection

Interfacial Forces in Dispersion Science and Technology

Prediction of cooling curves during solidification of Al 6061–SiCp based metal matrix composites using finite element analysis

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