Microstructure and grain refining performance of Ce on A380 alloy

Vončina, Maja; Mrvar, Primož; Petrič, Mitja; Medved, Jožef

doi:10.2298/jmmb110712020v

Cited by 10 publications

(6 citation statements)

References 8 publications

(9 reference statements)

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“…It is worth noting that in another study Voncina et al [82] reported that addition of Ce to A380 alloy led to a change in the morphology of eutectic Al 2 Cu phase from "crumbled" to fully formed (finer eutectic-like to blocky form) and caused the formation of small primary crystals of α Al which resulted in grain refining of the alloy. A needle-shaped AlCeCuSi phase (Al 9 Ce 2 Cu 5 Si 3 ) was also detected.…”

Section: Effects Of Cerium Additionsmentioning

confidence: 99%

“…It was found that with addition of Ce and Sr., the grain size of the dendritic α-Al phase becomes well refined, decreasing from 150 μmto90μm, and is attributed to the exponential increase in nucleation frequency (10 24 ), compared to the unmodified alloy, and restricted growth. Increasing the Ce level (0, 0.3, 0.5, 0.8 and 1 wt.%) in Al-20%Si alloy would cause a significant refinement of the primary Si crystals with the change in the morphology of the eutectic Si phase from coarse platelet like to a fine fibrous Al-corner of ternary Al-Si-Ce system [82].…”

Section: Effects Of Cerium Additionsmentioning

confidence: 99%

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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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Section: Effects Of Cerium Additionsmentioning

confidence: 99%

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 rare earth elements (REE) represent the 17 metallic elements in the periodic table with high atomic numbers (57-71). This series is composed of the 15 lanthanides on the periodic table in addition to Sc (21) and Y (39), which exist in the same ores containing the oxides of the REE/RE [1][2][3][4]. Most of the RE elements were named after the places where they were found or after the names of the scientists who discovered them.…”

Section: Introductionmentioning

confidence: 99%

Effect of Casting Processes, Rare Earth Metals, and Sr Addition on Porosity Formation in Al-Si Cast Alloys

Samuel,

M. Samuel,

Songmene

et al. 2024

Recent Advancements in Aluminum Alloys

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The present work was carried out on A413.1cast alloy that was characterized by short freezing temperature range. Measured amounts of high purity (99.99%) rare earth metals (Ce, La, La + Ce) were added to the non-modified and Sr-modified molten metal. Three casting molds were used viz., graphite mold heated at 600°C for the purpose of obtaining solidification curves, metallic mold with three variable opening angles heated at 350°C, and a step-like metallic mold heated at 200 and 400°C. The main results are earth metals (RE) would lead to porosity formation in all molds with increase in its percentage in Sr-modified alloys. Since the maximum α-Al network formation temperature is in the range of 575–580°C, some of the RE may precipitate in the liquid state leading to blocking the flow of the liquid metal. However, considering the metal was degassed using high purity argon gas, most of the observed porosities are of shrinkage type. In addition, increasing the amount of used RE, and hence percentage of unsoluble intermetallics results in marked decrease in the alloy strength. The only observed advantage is the effectiveness of La is reducing the alloy grain size due to its low affinity to react with Ti.

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“…It depends of many factors such as chemical composition, melt treatment, i.e. grain refinement, eutectic modification, cooling rate and heat treatment [2,3]. Aluminium alloys represent an important material due to their wide range of application in aerospace, automotive and household industries.…”

Section: Introductionmentioning

confidence: 99%

Influence of copper content on microstructure development of AlSi9Cu3 alloy

Brodarac

Dolić

Unkić

2014

J min metall B Metall

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Microstructure development and possible interaction o f present elements have been determined in charge material o f EN AB AlSi9Cu3 quality. Literature review enables prediction o f solidification sequence. Modelling o f equilibrium phase diagram fo r examined chemical composition has been performed, which enables determination o f equilibrium solidification sequence. Microstructural investigation indicated distribution and morphology o f particular phase. Metallographic analysis tools enable exact determination o f microstructural constituents: matrix aAr eutectic a u+ fsr iron base intermetallic phase -AfFeSi, A l/F e ,M n )C u S iw and/or Al/Fe,M n) M g,CuSin, and copper base phases in ternary eutectic morphology AI-AfCu-Si and in complex intermetallic ramified morphology Al/F e,M n)vMg,SiuCuw. Microstructure development examination reveals potential differences due to copper content which is prerequisite fo r high values o f final mechanical, physical and technological properties o f cast products.

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Microstructure and grain refining performance of Ce on A380 alloy

Cited by 10 publications

References 8 publications

Applications of Rare Earth Metals in Al-Si Cast Alloys

Applications of Rare Earth Metals in Al-Si Cast Alloys

Effect of Casting Processes, Rare Earth Metals, and Sr Addition on Porosity Formation in Al-Si Cast Alloys

Influence of copper content on microstructure development of AlSi9Cu3 alloy

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