Comparing the roles of Sb and Bi on microstructures and application properties of the Al-15% Si alloy

Pereira, Cleiton Luiz; Gomes, Leonardo Fernandes; Garcia, Amauri; Spinelli, José Eduardo

doi:10.1016/j.jallcom.2021.160343

Cited by 25 publications

(4 citation statements)

References 42 publications

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“…Likewise, bismuth (Bi) exerts the same effect on eutectic morphology and does not increase porosity. In an Al-15Si alloy, both Sb and Bi were effective as modifiers, but Bi caused superior improvement of mechanical properties [57]. However, the presence of Bi up to 200 ppm in a Na-modified A356 alloy caused coarsening of the eutectic Si phase due to an effect of increasing nucleation and growth temperatures of this phase, besides forming an Mg-Na-Bi intermetallic that reduces the efficiency of Na as modifier [58].…”

Section: Modifiers Of the Eutectic Morphologymentioning

confidence: 99%

The Influence of Alloying Elements on the Microstructure and Properties of Al-Si-Based Casting Alloys: A Review

Callegari

Lima

Coelho

2023

Metals

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The excellent casting behavior and mechanical and corrosion properties of aluminum-silicon (Al-Si)-based alloys make them ideal for the manufacture of lightweight components with complex geometries. However, these properties depend directly on their microstructure, which, in its turn, is strongly affected by the composition of the alloy, among other factors. Several elements can be added to the material aiming to promote microstructural changes, e.g., grain refinement, optimization of phase morphology and distribution, and precipitation strengthening. Efforts are continuously put into such enhancements of cast Al alloys since they lead to quality improvements that allow for weight reduction and safety increase. Considering the technological relevance of the subject, this paper provides an overview of the research focused on the addition of alloying elements to these alloys, with a greater focus on Al-Si-based systems and the comprehension of the effects of these additions on their microstructure and properties.

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Section: Modifiers Of the Eutectic Morphologymentioning

confidence: 99%

The Influence of Alloying Elements on the Microstructure and Properties of Al-Si-Based Casting Alloys: A Review

Callegari

Lima

Coelho

2023

Metals

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“…Aluminum-silicon (Al-Si) alloys find extensive applications across, for example, automotive, aerospace, electronics, power generation, construction, and sports industries due to their lightweight nature, good mechanical properties, and corrosion resistance [1][2][3][4]. Eutectic Si in conventionally cast Al-Si alloys exhibits the form of branched clusters of plates or flakes, known as a wheatsheaf configuration [5].…”

Section: Introductionmentioning

confidence: 99%

Crystallography and Interface Structures in As-Arc Melted and Laser Surface-Remelted Aluminum–Silicon Alloys with and without Strontium Addition

Sahu,

Andani,

Ghosh

et al. 2024

Crystals

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The crystallography of the eutectic Al-Si microstructure in both unmodified and Sr (0.2 wt.%)-modified hypereutectic Al-20 wt.% Si alloys, processed via arc-melting and laser surface remelting, has been comprehensively characterized using transmission electron microscopy and electron diffraction. Although, under as-cast conditions, specific orientations between different planes of Al and Si, satisfying defined orientation relationships (ORs), have been investigated within the flake morphology, the rapid solidification induced by laser surface remelting results in a notable transformation from a flake morphology to nanocrystalline Si fibers dispersed in an Al matrix. Consequently, this transformation results in a mis-orientation of the interface between the eutectic Al and Si phases, preventing the formation of orientation relationships, thus promoting the formation of faceted interfaces exhibiting substantial lattice disregistry.

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“…It is widely used in fields such as automobiles, aerospace, construction engineering, and electronic communication [ 1 , 2 , 3 ]. The hypereutectic Al-Si alloys with silicon in the range of 16–24 wt.% are ideal materials for manufacturing cylinders and pistons [ 4 ]. As the silicon content increases, the size of primary Si particles in hypereutectic Al-Si alloys gradually increases, exhibiting rough plate-like and angular shapes.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effect of Strontium and Melt Quenching on the Solidification Microstructure of Hypereutectic Al-Si Alloys

Wang,

Chen,

Liu

et al. 2023

Materials

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The synergistic effect between strontium (Sr) and melt quenching on the solidified microstructure of hypereutectic Al-Si alloys was investigated by optical and scanning electron microscopy. The results indicate that melt quenching can suppress the growth of primary Si particles in the solidified structure of the hypereutectic Al-Si alloy, resulting in a significant decrease of in the average size of primary Si particles in Al-(18~22)Si alloys from 30.35~66.31 μm to 15.13~34.63 μm. The synergistic effect between Sr and melt quenching can further inhibit the precipitation of primary Si particles in the Al-18Si alloy. After the addition of Sr to Al-18Si alloy and undergoing melt quenching, the area fraction of primary Si clearly decreases. When the added amount of Sr increases from 0.1 wt.% to 0.5 wt.%, the area fraction of primary Si decreases from 1.13% to 0.16%. With 0.5 wt.% Sr in the tested alloy, the inhibiting effect on primary Si precipitation was significantly improved. Research has shown that the cooling rate has a significant impact on the solidified structure of the melt-quenched Al-18Si-0.5Sr alloy. There exists no primary Si in solidified structures on the area of 1/8R and 1/4R from the surface of the round bar sample, but the area fraction of primary Si increases, respectively, to 1.97% and 12.48% on the area of 1/2R and R from the surface. The higher the cooling rate, the higher the inhibitory effect on the primary Si precipitation in the Al-18Si-0.5Sr alloy.

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Comparing the roles of Sb and Bi on microstructures and application properties of the Al-15% Si alloy

Cited by 25 publications

References 42 publications

The Influence of Alloying Elements on the Microstructure and Properties of Al-Si-Based Casting Alloys: A Review

The Influence of Alloying Elements on the Microstructure and Properties of Al-Si-Based Casting Alloys: A Review

Crystallography and Interface Structures in As-Arc Melted and Laser Surface-Remelted Aluminum–Silicon Alloys with and without Strontium Addition

Synergistic Effect of Strontium and Melt Quenching on the Solidification Microstructure of Hypereutectic Al-Si Alloys

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