Solidification of Al-Al3Ni(Cu) eutectics at high gravity

Bárczy, Pál; Sólyom, J.; Regel, L. L.

doi:10.1016/0022-0248(92)90215-5

Cited by 12 publications

(4 citation statements)

References 2 publications

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“…On the other hand, the model of Favier and de Goer does not explain the influence of gravity on the microstructure of fibrous eutectics. This is based on the results of Barczy et al [46] and on the present experiments with current pulsing.…”

Section: Resultsmentioning

confidence: 58%

“…In reality, the fluid velocity only approaches zero as one approaches a solid surface, the so-called "no slip" condition of fluid mechanics). Barczy et al [46] performed a series of directional experiments on the Al-A1,Ni system for a variety of compositions in a centrifuge. Although the microstructure was influenced by the centrifuge's rotation rate, composition had no effect.…”

Section: Introductionmentioning

confidence: 99%

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Influence on Gravity on the Microstructure of the MnBiBi Eutectic

Cai

1995

Phys. Stat. Sol. (a)

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Larson and Pirich showed that the MnBi fiber spacing in the Mn–Bi system is finer when the alloy is solidified in space or in the presence of a magnetic field. In completion of a program aimed at explaining these results, the influence of electric current pulses on the MnBi fiber spacing is determined. Small, frequent electric current pulses cause fiber spacing to increase. The fiber spacing is roughly proportional to the length of the current pulse and its amplitude. An additional piece of information is the recent results by Smith, showing no influence of low gravity on the MnBi fiber spacing. Consequently now the Larson‐Pirich results are believed to be caused by a fluctuating freezing rate on earth, resulting from time‐dependent buoyancy‐driven convection. The fiber spacing adjusts more readily to a sudden decrease in freezing rate than it does to a sudden increase in freezing rate. That is, the MnBi fibers are terminated more readily than they branch. If the reverse is true, then a fluctuating freezing rate would cause a decrease in fiber spacing rather than an increase.

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Section: Resultsmentioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Influence on Gravity on the Microstructure of the MnBiBi Eutectic

Cai

1995

Phys. Stat. Sol. (a)

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“…The study of materials solidified in centrifuges improves the understanding how the accelerations, bigger than the Earth's gravity, influence on materials processing. Large centrifuges are expensive and hardly available for crystal growth and solidification experiments [2,[6][7][8][9][10][11]. To overcome this difficulty, a small centrifuge was designed 1 and built at Associated Laboratory of Sensors and Materials of the National Institute of Space Research (LABAS/INPE), which provides an acceleration ranging from 1 to 10 times the Earth gravity [11].…”

Section: Introductionmentioning

confidence: 99%

Development and Construction of a Centrifuge for Materials Processing in High Accelerations

Tenório¹,

Freitas²,

Lomas³

et al. 2018

TMM

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Different accelerations, larger or smaller than Earth's gravity, can influence the materials solidification process. In order to study these effects in metallic alloys and semiconductors, a research centrifuge was developed at the Associated Laboratory of Sensors and Materials of the National Institute of Space Research (LABAS / INPE). The equipment aims to study the materials solidification both under high accelerations and also at the launching conditions of the VSB-30 sounding rocket, which reaches 180 RPM (revolutions per minute) during upward flight. This launcher was used to perform microgravity experiments in previous laboratory work. This paper presents the design, the component fabrication and the centrifuge assembly.

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“…The thermal buoyancy can be negated by orienting directional growth antiparallel to the gravity, since the less dense fluid will then float over the colder one which at the solid/liquid interface. Although there are contradictory reports in the literature on the effect of convection on coupled growth [135][136][137][138][139][140][141][142][143][144], due to very limited solute boundary layer, regular binary eutectics are not much affected from the effect of convection.…”

Section: Effect Of Convectionmentioning

confidence: 99%

Invariant and univariant eutectic solidification in ternary alloys

Sargin

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Solidification of Al-Al3Ni(Cu) eutectics at high gravity

Cited by 12 publications

References 2 publications

Influence on Gravity on the Microstructure of the MnBiBi Eutectic

Influence on Gravity on the Microstructure of the MnBiBi Eutectic

Development and Construction of a Centrifuge for Materials Processing in High Accelerations

Invariant and univariant eutectic solidification in ternary alloys

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