Reduction in secondary dendrite arm spacing in cast eutectic Al–Si piston alloys by cerium addition

Ahmad, Roslee; Asmael, Mohammed; Shahizan, N.R.; Gandouz, S.

doi:10.1007/s12613-017-1382-9

Cited by 30 publications

(12 citation statements)

References 58 publications

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“…Generally, a more refined secondary dendrite spacing is desirable. According to Ahmadetal et al [15], SDS depends on the composition and existence of additive elements, which is used to describe the scale of columnar dendritic structures [16].…”

Section: Resultsmentioning

confidence: 99%

Influence of Vanadium on the Microstructure of IN718 Alloy by Laser Cladding

et al. 2019

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A deleterious Laves phase forms in the solidified structure of Inconel 718 (IN718) alloy during laser cladding. However, effective removal methods have not yet been identified. In this study, we first added the IN718 alloy cladding layers with a trace amount of vanadium (V, 0.066 wt.%). Then, we studied the solidification structure of cladding layers using a confocal laser scanning microscope and scanning electron microscopy. The microstructure and Laves phase morphology were investigated. The distribution of niobium (Nb) was observed by experiment as well. We found that V is evenly distributed in dendrites and interdendritic zones. A more refined dendrite structure, reduced second dendrite arm spacing and lower volume fraction of Laves phase were observed in the solidification structure. The results of linear energy-dispersive X-ray spectroscopy (EDS) indicate that the concentration of Nb decreases with an increasing of the distance from the Laves phase. The V-containing sample displayed a relatively slower decreasing tendency. The IN718 alloy sample was harder with the addition of V. In addition, the porosity of the sample decreased compared with the blank sample. The presented findings outline a new method to inhibit the Nb segregation in IN718 alloy during laser cladding, providing reference significance for improving the performance of IN718 alloy samples during actual processing.

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Section: Resultsmentioning

confidence: 99%

Influence of Vanadium on the Microstructure of IN718 Alloy by Laser Cladding

et al. 2019

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“…Promising scientific investigations were made by Ahmad and coworkers [87,88] on the influence of Ce on the microstructure of a commercial Al-11%Si-Cu-Mg eutectic cast alloy (ADC12). The main findings from their studies are summarized below.…”

Section: Effects Of Cerium Additionsmentioning

confidence: 99%

Applications of Rare Earth Metals in Al-Si Cast Alloys

Mahmoud¹,

Zedan²,

Samuel³

et al. 2021

Advances in High-Entropy Alloys - Materials Research, Exotic Properties and Applications

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The present article reviews a large number of research publications on the effect of mischmetal (MM), rare earth metals (RE), La or Ce, and combinations of La + Ce on the performance of Al-Si cast alloys mainly 319, 356, 380, 413, and 390 alloys. Most of these articles focused on the use of rare earth metals as a substitute for strontium (Sr) as a eutectic silicon (Si) modifier if added in low percentage (< 1 wt.%) to avoid precipitation of a significant amount of insoluble intermetallics and hence poor mechanical properties. Other points that were considered were the affinity of RE to react with Sr., reducing its effectiveness as modifier, as well as the grain refining efficiency of the added RE in any form. None of these articles mentioned the exact composition of the RE used and percentage of tramp elements inherited from the parent ore. Using high purity La or Ce proved to have no effect on the Si shape, size or distribution, in particular at low solidification rates (thick sections). However, regardless the source of the RE, its addition to Sr-modified alloys reduced the modification effect. As for grain refining, apparently a high percentage of RE (> 1 wt.%) is required to achieve a noticeable reduction in grain size, however at the cost of alloy brittleness.

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“…Sodium and Strontium are the most common and widely used in the foundry industry to alter the form of the silicon from flake to fibrous shape. The selection of a modifying agent also depends on some features such as ease of dissolution, vapour pressure and stability in the melt [6, 8, 19]. Moreover, the large negative value of mixing enthalpy with silicon is suggested as a new parameter, in addition to crystal structure and lattice constant [20].…”

Section: Introductionmentioning

confidence: 99%

Solidification and microstructure characterizations of eutectic aluminum‐silicon casting alloy with the addition of tin

Khatibi

Asmael

Safaei

et al. 2021

Materialwissenschaft Werkst

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The effects of tin (Sn) addition on aluminum‐silicon and α‐aluminum phase solidification parameters as well as eutectic aluminum‐silicon casting alloy microstructure are systematically investigated. In this research, these characteristic parameters are examined by using computer‐aided cooling curve thermal analyses. The results of microstructure analyses and cooling curves show that tin alters silicon structure. By increasing the amount of tin up to 1 wt.%, α‐aluminum phase nucleation temperature, aluminum‐silicon phase growth temperature, and last phase solidus temperature increase. The mean area of silicon particles decreases when 0.1 wt.% tin is added but by its further increasing up to 1 wt.%, silicon particle mean area increases. It means that increase of tin content does not lead to silicon structure modification in this type of aluminum‐silicon alloy. Besides, by increasing the amount of tin, the reaction temperature of the last phase is increased by the formation of intermetallic compounds such as ternary compounds (Al−Si−Sn).

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Reduction in secondary dendrite arm spacing in cast eutectic Al–Si piston alloys by cerium addition

Cited by 30 publications

References 58 publications

Influence of Vanadium on the Microstructure of IN718 Alloy by Laser Cladding

Influence of Vanadium on the Microstructure of IN718 Alloy by Laser Cladding

Applications of Rare Earth Metals in Al-Si Cast Alloys

Solidification and microstructure characterizations of eutectic aluminum‐silicon casting alloy with the addition of tin

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