Degassing of Aluminum Alloy Melts by High Shear Melt Conditioning Technology: An Overview

Lazaro-Nebreda, Jaime; Patel, J. S.; Lordan, Ewan; Zhang, Yijie; Karakulak, Erdem; Al-Helal, Kawther; Scamans, G. M.; Fan, Z.

doi:10.3390/met12101772

Cited by 6 publications

(3 citation statements)

References 50 publications

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“…Hydrogen pores can be removed by argon gas bubbling. Argon bubbles are supplied in liquid aluminum and its alloys by inserting a nozzle whose side possesses holes for argon gas [32,33]). After the casting water was immersed into the ingot, the fibers and SUS wires were removed smoothly.…”

Section: Compressed Airmentioning

confidence: 99%

Fabrication of Aluminum Alloy with Open-Channel and Columnar Structures through a Ceramic Fiber Template Method

Nakajima

2023

Metals

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Aluminum alloys with open-channel and columnar structures were fabricated by casting the melt of aluminum alloys using a ceramic fiber template method. Stainless steel plates or wires coated with ceramic fibers impregnated by polyvinyl alcohol were used as cores. The cores were embedded in a melt of an aluminum alloy. After solidification, the ceramic fibers were macerated and became sodden by immersing the aluminum alloy ingots in water so that the plates or wires were easily removed by extraction forces as large as 5N, in other words, by pulling out them manually. Thus, an open-channel aluminum alloy was fabricated by a simple method. On the other hand, ceramic fiber blocks composed of ceramic fibers impregnated by polyvinyl alcohol were perforated by microdrills. Melts of aluminum alloy were cast in the holes by a vacuum suction method. The ceramic fibers were removed by immersing the ingots in water. Thus, a columnar-structured aluminum alloy was produced. Previous methods for the fabrication of open-channel metals necessitates a process to extract the metallic wires embedded in the solidified metals. However, the ceramic fiber template method does not require such an extraction process and thus is a very simple technique for the fabrication of open-channel metals, such as porous metals with rectangular holes and circular holes and columnar structures metals.

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Section: Compressed Airmentioning

confidence: 99%

Fabrication of Aluminum Alloy with Open-Channel and Columnar Structures through a Ceramic Fiber Template Method

Nakajima

2023

Metals

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“…The initial studies of the A380-xMn-yFe alloy system to understand the potential and limitations of the purification method were conducted computationally, although with some experimental validation [31,44]. Later studies involved the use of melt conditioning to study its effect in the separation process [45][46][47] as well as the effect of solidification processing conditions [48]. Table 2 presents an example of two of the alloys studied, and for which we will be presenting some key results later in the paper.…”

Section: Alloymentioning

confidence: 99%

De-Ironing of Aluminium Alloy Melts by High Shear Melt Conditioning Technology: An Overview

Lazaro-Nebreda

Patel

Al-Helal

et al. 2022

Metals

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The main problem of recycling aluminium scrap is the gradual accumulation of impurities, especially iron, which tend to form undesired intermetallic compounds that affect the integrity and the mechanical performance of the castings. In this paper, we aim to provide an overview on the topic of iron removal from aluminium melts through primary intermetallic precipitation and the progress made during the LiME Hub project to understand the process and to develop a more efficient procedure. We cover both thermodynamic analysis and experimental validation. We found that high shear melt conditioning technology enhances the typically slow nucleation and growth of the dense primary intermetallics, speeding up their sedimentation and allowing a faster removal of Fe from the melt by simple gravity sedimentation. It also promotes the formation of smaller and more compact Fe-rich intermetallics, allowing an increased volume fraction recovery and mitigating their effect of being present in the final castings. The technology is not limited to batch processing, with a 90% efficiency, but can also be applied to continuous melt treatment of aluminium scrap, with currently 60% efficiency, and could be combined with other solid–liquid separation techniques to increase the purification efficiency even more.

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“…In the case of the analyzed grades of HSCI cast iron (Si content above 20%), we deal with many components of the microstructure: graphite, silicon ferrite, intermetallic phases, and bifilm inclusions [19][20][21][22][23]. The iron-silicon phase balance system is well known [24].…”

Section: Introductionmentioning

confidence: 99%

Crystallization of Intermetallic Phases Fe2Si, Fe5Si3 for High Alloyed Cast Irons

Stawarz

2023

Crystals

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This paper presents the results of laboratory tests related to high-alloy silicon cast iron (HSCI). These materials are corrosion-resistant and commonly used in cathodic protection systems as protective electrodes. Due to their high fragility, alloys with increased Si content are not suitable for producing elements exposed to dynamic loads. This paper analyzes the crystallization process of silicon alloys (with Si content between 23% and 25%) using thermal and derivation analysis methods. The tests also included an extended analysis of chemical composition. The metallographic tests included scanning electron microscopy with an EDS system, and the phase composition was determined using X-ray diffraction. As a result of the tests, the warp components were identified, the primary share of which are intermetallic phases of the Fe5Si3 type. Moreover, single silicon crystals were found. The test results allowed for clarification of the temperature range of the transition of the Fe2Si phase into the Fe5Si3 phase and the determination of characteristic points of the crystallization process (TSolidus i TLiquidus). Furthermore, bifilm-type inclusions were identified in the alloys. We also managed to present the silicon crystals and Fe5Si3 phases in a spatial layout via observation of the surfaces of contraction cavities using scanning electron microscopy.

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Degassing of Aluminum Alloy Melts by High Shear Melt Conditioning Technology: An Overview

Cited by 6 publications

References 50 publications

Fabrication of Aluminum Alloy with Open-Channel and Columnar Structures through a Ceramic Fiber Template Method

Fabrication of Aluminum Alloy with Open-Channel and Columnar Structures through a Ceramic Fiber Template Method

De-Ironing of Aluminium Alloy Melts by High Shear Melt Conditioning Technology: An Overview

Crystallization of Intermetallic Phases Fe2Si, Fe5Si3 for High Alloyed Cast Irons

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