Rapid solidification of undercooled Al-Cu-Si eutectic alloys

Ruan, Ying; Wei, B.

doi:10.1007/s11434-008-0540-x

Cited by 15 publications

(3 citation statements)

References 12 publications

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“…In the (Al+θ+Si) ternary eutectics, the (Al) and θ phases grow cooperatively, while the faceted (Si) phase grows like a needle with a preferred growth orientation. The average length of the (Si) phase was 56 μm [10].…”

Section: Microstructural Characteristicsmentioning

confidence: 99%

“…Previously, the containerless melting and solidification of low-melting point materials, such as Bi-Ga and Pb-Sn alloys, were performed using the single-axis acoustic levitation technique [3][4][5]. In this paper, we have extended the application of single-axis acoustic levitation to the containerless processing of an Al-27%Cu-5.3%Si ternary alloy, which has a higher melting point than alloys that have been investigated previously [10]. The mechanisms of rapid eutectic growth during acoustic levitation were studied.…”

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confidence: 99%

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Rapid solidification of acoustically levitated Al-Cu-Si eutectic alloy under laser irradiation

et al. 2011

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Al-27%Cu-5.3%Si ternary eutectic alloy was melted using a YAG laser and then solidified while being acoustically levitated. A maximum undercooling to 195 K (0.24 T L ) was achieved with a cooling rate of 76 K/s. The solidification microstructure was composed of (Al+θ+Si) ternary eutectics and (Al+θ) pseudobinary eutectics. During acoustic levitation, the (Al+θ+Si) ternary eutectics are refined and the (Al+θ) pseudobinary eutectics have morphological diversity. On the surface of the alloys, surface oscillations and acoustic streaming promote the nucleation of the three eutectic phases and expedite the cooling process. This results in the refinement of the ternary eutectic microstructure. During experiments, the reflector decreases with increasing alloy temperature, and the levitation distance always exceeds the resonant distance. Because of the acoustic radiation pressure, the melted alloy was flattened, and deformation increases with increasing sound pressure. The maximum aspect ratio achieved was 6.64, corresponding to a sound pressure of 1.8×10 4 Pa.

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Section: Microstructural Characteristicsmentioning

confidence: 99%

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confidence: 99%

Rapid solidification of acoustically levitated Al-Cu-Si eutectic alloy under laser irradiation

et al. 2011

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“…Therefore, when silicon (Si) was added into the Al-Cu-Si and magnesium (Mg) to Al-Cu-Mg respectively to improve castability, those elements became important in the manufacturing world as ingots (raw material). But the addition of Si and Mg in duralumin cause problems with the appearance of intermetallic phase (Al80.4Cu13.6Si6, Al2CuMg, MgO, MgAl2O3) that are fragile, prone to hot cracking, and reduce heat-treatable [4,5,6].…”

Section: Introductionmentioning

confidence: 99%

Analytical and Experimental Models of Porosity Formation of Duralumin Cast in Vacuum Casting System

Suprapto

Suharno

Soedarsono

et al. 2011

AMR

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Porosity in cast metals often leads to cracking of components due to stress concentration and leakage, and as the result, the castings need be repaired or rejected. Disharmony in casting process was resulting in porosity. Prediction of porosity in the casting is necessary as a step to avoid the waste products and reduce costs. But to ensure whether these predictions are accurate and precise, it is still necessary to validate the test trials and testing. This paper aims to provide early information when, where, and how large a defect occurs in particular foundry casting porosity on duralumin. The analytical study of porosity formation based analytic equilibrium wt% of element, the behavior of the thermodynamic, hydrodynamic, and rules of metallurgical on vacuum casting of duralumin. Experiments as a validation study are conducted by duralumin remelting on stainless-steel bowl in a vacuum casting furnace. Analytical simulation and experiments of the casting that has been vacuumed by melting 10 cmHg pressures higher than the pressure solidification, and duralumin melt is poured automatically into permanent mold carbon steel. In the study cast duralumin created five different thicknesses. Both these studies assume the addition of copper (2.5%, 3.0%, 3.5 %, 4.0%, and 4.5% Cu) and vacuum pressure (76, 50, 40, cmHg), as independent variables, while dependent variable in the studies is porosity characteristics, which includes morphology, number and dimensions of the porosity. Optical emission spectrometry test, Reynold's and Niyama numbers, Sievert's law, Archimedes' principle (Pycnometry and Straube-Pfeiffer tests), and Eichenauer equation are instruments which are used to determine the characterization of duralumin casting porosity. Duralumin ingots remelting process was performed by the control pressure (p1) and temperature (T1). Vacuuming process performed after the smelting room temperature reaches 600 °C. Once melted, it followed by duralumin into a permanent mold (p2, T2). As a control parameter is the height of pouring (7 cm), pour temperature and mold temperature respectively at 750 °C and 300 °C. The porosity characteristics studies of two models produce two types of porosity (gas and shrinkage), the quantity dimension and porosity, and distribution of porosity in the cast duralumin.

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