Modification of eutectic Si in Al–Si alloys with Eu addition

Li, J.H.; Wang, X.D.; Ludwig, Thomas; Tsunekawa, Yoshiki; Arnberg, L.; Jiang, J.Z.; Schumacher, Peter

doi:10.1016/j.actamat.2014.10.064

Cited by 180 publications

(77 citation statements)

References 18 publications

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“…[17,18] It appears that the behavior of Eu is similar to that of Sr and Na and multiply twinned Si particles were observed within eutectic Si. [19] An alternate approach to modify the microstructure in Al-Si alloys is to increase the cooling rate and modify the nucleation. [20,21] Rapid solidification can significantly improve the mechanical properties of cast Al-Si components.…”

Section: Introductionmentioning

confidence: 99%

EBSD Study of the Influence of a High Magnetic Field on the Microstructure and Orientation of the Al-Si Eutectic During Directional Solidification

Fautrelle

Gagnoud

et al. 2016

Metall Mater Trans A

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International audienceThe effect of a high magnetic field on the morphology of the Al-Si eutectic was investigated using EBSD technology. The results revealed that the application of the magnetic field modified the morphology of the Al-Si eutectic significantly. Indeed, the magnetic field destroyed the coupled growth of the Al-Si eutectic and caused the formation of the divorced alpha-Al and Si dendrites at low growth speeds (a parts per thousand currency sign1 mu m/s). The magnetic field was also found to refine the eutectic grains and reduce the eutectic spacing at the initial growth stage. Moreover, the magnetic field caused the occurrence of the columnar-to-equiaxed transition of the alpha-Al phase in the Al-Si eutectic. The abovementioned effects were enhanced as the magnetic field increased. This result should be attributed to the magnetic field restraining the interdiffusion of Si and Al atoms in liquid ahead of the liquid/solid interface and the thermoelectric magnetic force acting on the eutectic lamellae under the magnetic field. (C) The Minerals, Metals & Materials Society and ASM International 201

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Section: Introductionmentioning

confidence: 99%

EBSD Study of the Influence of a High Magnetic Field on the Microstructure and Orientation of the Al-Si Eutectic During Directional Solidification

Fautrelle

Gagnoud

et al. 2016

Metall Mater Trans A

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“…A widely used method of influencing the microstructure of silicon precipitations in Al-Si alloys is the modification by ultrafine particles of compounds of rare-earth and refractory metals [2][3][4][5][6][7]. In this article, it is shown that the introduction of modifiers leads to a change in the temperatures of basic solidification processes and, accordingly, the morphology of basic structural-phase component materials.…”

Section: Introductionmentioning

confidence: 99%

Influence of Modifying Mixtures on Si Crystal Formation in Al-7%Si Alloy

Zykova

Казанцева

Попова

et al. 2018

Metals

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Using scanning and transmission electron microscopy, we studied silicon particles formed during the solidification of Al-7%Si alloy when different modifying mixtures were introduced into the melt: (1) a mixture of ultrafine powders Na 3 AlF 6 + K 2 ZrF 6 + TiO 2 + ZrO 2 ; (2) K 2 ZrF 6 ; and (3) the flux Arsal. By differential scanning calorimetry, it was established that modifying mixtures significantly influenced the temperature of the solidification processes. The formation of two types of Si crystals was established. The first type of Si crystals precipitated during the solidification of the eutectic mixture (α-Al + Si) in the form of needles or plates. The second type of Si crystals was segregated from eutectic Al-phases or segregated from the solid phase α-Al upon cooling in the solid state. The introduction of modifiers led to a shift in solidification temperatures. When fluoride salts were used, there was an increase in the temperature of eutectic solidification. Silicon crystals were large (up to 10 µm), with a local excess of aluminum concentration.

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“…In recent years, many works have been devoted to the metallurgical modification of Al-Si alloys [1][2][3][4][5]. Experimental data on silumin modification via the addition of different salts including strontium, sulphur, phosphorus and nickel, have been presented.…”

Section: Introductionmentioning

confidence: 99%

“…When injected into the melt via powder particles, they are absorbed by the melt as a result of their small size and equally spread throughout the volume. These particles act as centres of potential crystallization [4]. Modification by ultrafine powder leads to the formation of a uniform crystallographic structure, which is determined by the creation of a high concentration of crystallization centres in any single melt volume unit [8].…”

Section: Introductionmentioning

confidence: 99%