Modification of Al–Si alloys by metallothermic reduction using submerged SrO powders injection

Molina, Constancio Marco; Valdés, Alfredo Flores; Valdéz, Raúl; Torres, J.; Rosales, N. Rodríguez; Estrada, Rafael G.

doi:10.1016/j.matlet.2009.01.019

Cited by 14 publications

(5 citation statements)

References 5 publications

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“…A popular method that affects the microstructure formation and enhances mechanical properties of Al-Si alloys is an introduction of additions of super- and nanodispersed particles of various chemical compositions into the melt. Nowadays, a lot of experimental data on the use of metal oxides (γ-Al 2 O 3 , Al 2 O 3 , TiO 2 , ZrO 2 , SrO) [1,2,3,4,5], rare-earth elements (Sr, Cr, Sm, Eu, etc.) [6,7,8,9], carbides (TiCN) [10], borides (Nb-B, Ti-B) [11,12] have been accumulated for changing dendritic α-Al, the morphology and the size of eutectic Si and Fe-containing phases.…”

Section: Introductionmentioning

confidence: 99%

Influence of W Addition on Microstructure and Mechanical Properties of Al-12%Si Alloys

et al. 2019

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A widespread method exerting the influence on the homogeneous formation of the microstructure and enhancement of strength properties of Al-Si alloys is a modification by super- and nanodispersed particles of different chemical compositions. In spite of the significant advances in the studies of the influence of various modifying compositions on the structure and mechanical properties of casted silumins, the literature contains no data about the influence of nanodispersed W-powder on formation of the structural-phase state and mechanical properties of Al-Si alloys. The paper considers the influence of 0.01–0.5 mass % W nanopowder on the structural-phase state and mechanical properties of an Al-12%Si alloy. It has been established that 0.1 mass % of W is an optimal addition. It results in the uniform distribution of eutectic (α-Al + Si), a 1.5-time decrease in the size of the plates of eutectic Si, a change of the shape of coarse plates (coarse plate-like or acicular) into a fine fibrous one, and an enhancement of the mechanical properties by 16–20%.

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Section: Introductionmentioning

confidence: 99%

Influence of W Addition on Microstructure and Mechanical Properties of Al-12%Si Alloys

et al. 2019

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“…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. At present, a sufficiently large volume of experimental data on the use of metal oxides (γ-Al 2 O 3 , Al 2 O 3 , TiO 2 , ZrO 2 , SrO), carbides (TiCN), borides (Nb-B, Ti-B), carbon-bearing materials (BaCO 3 , C), and their mixtures has been accumulated for modification of the microstructure of primary matrix grains, the eutectic mixture, and precipitations of secondary phases of Al-Si alloys [8][9][10][11][12][13][14]. However, the literature presents ambiguous data on the influence of metal oxides on the microstructure of aluminum-silicon alloys.…”

Section: Introductionmentioning

confidence: 99%

“…However, the literature presents ambiguous data on the influence of metal oxides on the microstructure of aluminum-silicon alloys. In References [8][9][10][11][12][13][14], it was demonstrated that when modifying mixtures are used, one can observe the refinement of α-Al dendrites, their more uniform distribution, and refinement and change in the morphology of Si crystals in the eutectic mixture, which in turn enables the enhancement of mechanical properties. In Reference [15], the authors explain the influence of P and Sr on the various morphologies of Si particles in alloys of the Al-7%Si type.…”

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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“…One of the most interesting methods of silumin modification involves chemical modifiers that initiate exothermic reactions [9,11,12,13]. The results of studies investigating combinations of various elements and chemical compounds indicate that the microstructure and, consequently, the properties of alloys can be controlled.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of AlSi9Mg Alloy with a Sodium Modifier

Lipiński

Szabracki

2014

SSP

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Al–Si alloys are among the most popular casting metals. Two-component aluminium alloys with silicon are not suitable for direct use after melting. Subject to their silicon content, Al Si alloys have a coarse-grained eutectic phase, and alloys with more than 13% Si content also feature large crystallites or β-phase needles. The β-phase is hard, but also fragile. Large crystallites are good planes of division, and they reduce the mechanical properties of alloys.In this study, the Al-9% Si alloy was refined with a sodium modifier. The modifier was added to the mould by the in-mould method. The modifier's influence on the microstructure and mechanical properties of the alloy was presented graphically. The results of the analysis indicate that the compound modifier influenced the evaluated properties of the Al-9%Si hypoeutectic alloy.

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Modification of Al–Si alloys by metallothermic reduction using submerged SrO powders injection

Cited by 14 publications

References 5 publications

Influence of W Addition on Microstructure and Mechanical Properties of Al-12%Si Alloys

Influence of W Addition on Microstructure and Mechanical Properties of Al-12%Si Alloys

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

Mechanical Properties of AlSi9Mg Alloy with a Sodium Modifier

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