Solidification processing of metal matrix composites

Mortensen, Alicja; Jin, I.

doi:10.1179/imr.1992.37.1.101

Cited by 397 publications

(134 citation statements)

References 162 publications

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“…Although the addition of particulates increases strength and reduces microsegregation and the size of micro-porosity (among other benefits), hot-tearing susceptibility is significantly increased in MMC [36] as compared to "standard" aluminum alloys. In Fig.4, 3D renderings of the hot-tear formation in (a) semi-solid Al-15Cu and (b) semi-solid Al-15Cu-9.6vol.%MMC at a fraction solid of 0.75 are shown just prior to final fracture.…”

Section: (B) Evolution Of Damage During Hot-tearingmentioning

confidence: 99%

Quantitative 3D Characterization of Solidification Structure and Defect Evolution in Al Alloys

Puncreobutr

Lee

Hamilton

et al. 2012

JOM

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Geometrically complex, as-cast, aluminum alloy components offer substantial economic and design advantages as compared to many thermo-mechanical processing routes. However, the occurrence of potential defects, including porosity, intermetallics and hot-tears, remains an issue. Using these three defects as examples, recent developments in the methodologies for quantifying defect evolution and microstructure using 3D images captured in situ via X-ray microtomography are discussed. It is demonstrated that 3D quantification techniques can provide significant new insight into the mechanisms controlling defect formation, and how microstructure morphology affects component performance.

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Section: (B) Evolution Of Damage During Hot-tearingmentioning

confidence: 99%

Quantitative 3D Characterization of Solidification Structure and Defect Evolution in Al Alloys

Puncreobutr

Lee

Hamilton

et al. 2012

JOM

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“…[40], therefore becomes The set of ow equations in region 1 is simply derived from Eq. [2] and from the rst two terms of Eq. [36] (1 2 V sf ) l(x) 5 1 2 , neglecting any pressure drop within region…”

Section: Lower Boundmentioning

confidence: 99%

“…[1,2] Physical phenomena which govern this process for an unalloyed matrix material were analyzed in previous publications of this series, [3][4][5][6][7] to show, in particular, that there can be a strong interplay in this process between liquid matrix ow and matrix solidi cation caused by initially low preform or mold temperatures.…”

Section: Introductionmentioning

confidence: 99%

Infiltration of fibrous preforms by a pure metal: Part V. Influence of preform compressibility

Michaud

Mortensen

Sommer

1999

Metall Mater Trans A

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In ltration by a pure matrix in the presence of preform deformation and partial matrix solidi cation is analyzed using a bounding approach for the preform rheology where solid metal is present. It is found, using parameters for the in ltration of short alumina ber preforms by aluminum, that the two bounds are close in comparison to other factors of uncertainty in the prediction of in ltration rate. Using this approach, preform compression is shown to exert a signi cant in uence on the in ltration rate for the system explored; in particular, the analysis shows the existence of an optimal value of applied pressure. Simpli cations in the analysis are also presented, which yield fairly accurate results while easing their computation signi cantly.

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“…, and the saturation curve. We also compare the work actually spent to effect infiltration with the energy thermodynamically required by the process, this being the work of immersion of the relevant metal/reinforcement system, W i , times the preform specific surface [1,[5][6][27][28][29]. W i is related to and !"…”

mentioning

confidence: 99%

Influence of the wetting angle on capillary forces in pressure infiltration

2015

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This work probes the influence of wetting on pressure infiltration. Pressure/saturation curves for the infiltration of packed F-1000 angular alumina particle preforms by liquid Cu-Al and Sn-Al alloys are measured using an instrumented high-temperature pressure infiltration apparatus.These are ceramic-metal systems in which the contact angle is documented to vary significantly with alloying, from non-wetting to wetting conditions. We show that adding Al to Sn or to Cu modifies the early percolation-dominated phases of infiltration and also the later, pore geometry dominated, phase of the infiltration process. Changes in contact angle brought by alloying cause the saturation/pressure curves to shift, yet for all systems of this work the curves remain entirely in the range of positive pressures, despite a transition to contact angles below 90°. Combining measured pressures for infiltration at fixed saturation with relevant sessile drop experiment data from the literature shows that for, the range of conditions explored here, the infiltration pressures required are proportional, not to the work of immersion, but to a linear function thereof. This result agrees qualitatively with prior work in the literature on the infiltration of nonmetallic liquids in porous media, and provides a master curve by means of which saturation curves and sessile drop data can be reconciled for this particular packed ceramic particle preform.

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Solidification processing of metal matrix composites

Cited by 397 publications

References 162 publications

Quantitative 3D Characterization of Solidification Structure and Defect Evolution in Al Alloys

Quantitative 3D Characterization of Solidification Structure and Defect Evolution in Al Alloys

Infiltration of fibrous preforms by a pure metal: Part V. Influence of preform compressibility

Influence of the wetting angle on capillary forces in pressure infiltration

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