Measurement of Temperature Fields and Convection in an Eutectic Melt (II)

Holecek, S.; Procio, M.; Pražák, M.; Kubíček, L.

doi:10.1002/crat.2170260510

Cryst. Res. Technol.

1991

DOI: 10.1002/crat.2170260510

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Measurement of Temperature Fields and Convection in an Eutectic Melt (II)

S. Holecek¹,

M. Procio²,

M. Pražák³

et al.

Abstract: Various Types of convection have been studied in a molten AlZn Eutectic. Experiments have been conducted using a Bridgman-Stockbarger arrangement with a furnace slid onto the specimen and moving along the specimen axis. The apparatus rotated around the horizontal axis, which made it possible to carry out measurements at different angles a contained by the gravity and temperature gradient vectors in the specimen. The amplitudes and for periodic convection also the frequencies of the temperature fiuctuations hav… Show more

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1995

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Directional Solidification of AlZn Eutectic in Microgravity Conditions

Pražák

Holecek

1995

Cryst. Res. Technol.

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The directional solidification of an AlZn eutectic based on the Bridgman method has been carri_ed out on the Earth and in orbit on the Russian orbital station in microgravity conditions on a CSK-1 apparatus developed at the Institute of Physics, Czech Academy of Sciences in Prague.From the conditions of growthfurnace rate 0.1 mm/min, axial temperature gradient in the melt approx. 5 K/cmthe study of the microstructure and the measurements of interlamellar spacing, lamellae thickness ai, hardness HK and the anisotropy of linear thermal expansion it follows, that the microstructure of the specimens prepared in outer space shows an overall lower degree of directionality compared with specimens prepared in analogous terrestrial conditions.

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Directional Solidification of AlZn Eutectic in Microgravity Conditions

Pražák

Holecek

1995

Cryst. Res. Technol.

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Temperature Oscillations in Eutectic Alloy Melt for the Bridgman‐Stockbarger Configuration

Pražák

Holecek

1995

Cryst. Res. Technol.

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The characteristics of the temperature field in AlZn, AlGe, PbSn, and Sb—InSb low‐melting alloy eutectics were determined by means of the Bridgman‐Stockbarger method of directional solidification with a specimen fixed in a graphite ampoule and a moving furnace. The device could be rotated in such a way, that an arbitrary angle α between the axial temperature gradient in the melt and the gravity field vector could be set. Periodic and/or nonperiodic temperature fluctuations indicating periodic and/or nonperiodic turbulent convection up to an angle α = 80° were studied in the individual systems. At larger angles laminar convection can be expected. The frequency of the temperature oscillations is the same along the entire length of the specimen, whilst the amplitudes of the temperature oscillations depend on the situation of the measurement in the specimen. It has been found that the zone of unstable periodic convection is reduced with an increase of the axial temperature gradient and a decrease of the H/d ratio for a cylindrical ampoule. The convection instability threshold in the ampoule increases with the deviation of the ampoule axis from the axis of the vertical unstable arrangement, i.e. from the direction of the gravity vector. The threshold of the laminar flow instability and the onset of turbulent flow increases with the H/d ratio, i.e. an ampoule with a higher H/d ratio stabilizes laminar flow.

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Measurement of Temperature Fields and Convection in an Eutectic Melt (II)

Cited by 2 publications

References 1 publication

Directional Solidification of AlZn Eutectic in Microgravity Conditions

Directional Solidification of AlZn Eutectic in Microgravity Conditions

Temperature Oscillations in Eutectic Alloy Melt for the Bridgman‐Stockbarger Configuration

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