Investigating viscosity variations of molten aluminum by calcium addition and stirring

Elahi, S. Hossein; Abdi, Hadi; Shahverdi, Hamid Reza

doi:10.1016/j.matlet.2012.09.109

Cited by 16 publications

(2 citation statements)

References 15 publications

(15 reference statements)

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“…Paper-thin oxide films are generated as a result of the short contact time. 32 Strong stirring forms the internal shear force of the aluminium liquid, transforming the paper-thin oxide films into chip shapes. High contents of calcium and oxygen are detected at the cracked inclusion.…”

Section: Resultsmentioning

confidence: 99%

Formation mechanism and three-point bending behaviour of directly fabricated aluminium foam plates

Yang

Zhao

et al. 2016

Materials Science and Technology

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New-style smooth-faced aluminium foam plates (AFPs) covered by dense skins have been fabricated directly. AFPs with porosity ranging from 79.3 to 85.2% and with an average diameter of 2.3 to 2.7 mm are obtained via the melt foaming method. The formation mechanism of external dense skins is studied. The dense skin is composed of a cell wall of non-ruptured bubbles, a coarse region formed from ruptured bubbles and plateau borders. The fracture mechanism of AFPs is studied based on static three-point bending tests. They show that the cracked region is only observed at the centre of the experimental samples and that brittle fracture is the main fracture mechanism of these AFPs.

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Section: Resultsmentioning

confidence: 99%

Formation mechanism and three-point bending behaviour of directly fabricated aluminium foam plates

Yang

Zhao

et al. 2016

Materials Science and Technology

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“…[37,38] Furthermore, it has been previously reported that the agglomeration of oxide particles occurred when scan parameter C1 was applied. [40] Since the melt pool viscosity decreases with an increasing degree of agglomeration of particles, [63] this would contribute to inducing a larger surface instability of the melt pool. All of these cumulative effects associated with the physical presence of oxides particles thus contribute to reshaping the morphology of the melt pool and lead to the balling phenomenon.…”

Section: A Influence Of Coal 2 O 4 Addition On Melt Pool Morphologiesmentioning

confidence: 99%

Toward the Understanding of CoAl2O4 Additions on the Formation of Microstructure in Alloy 718 Processed by Laser Powder Bed Fusion

Chang

Tiparti

et al. 2022

Metall Mater Trans A

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This investigation rationalizes the impact of oxide particles on the melt pool and subsequent formation of microstructure in superalloy Inconel 718 (Alloy 718) processed by laser powder bed fusion (L-PBF). A mixture of Alloy 718 powder with 0.2 wt pct of CoAl 2 O 4 was processed without scan rotation. It was found that the physical presence of oxides appeared to increase the degree of melt pool penetration by inhibiting the heat transfer. Without favorable thermal conditions to trigger heterogeneous nucleation, a more noticeable tendency to form columnar grains was characterized in samples with CoAl 2 O 4 . It is believed that the presence of oxide particles in the melt pool contributed to decreasing the cooling rates during solidification and retarded the columnar-to-equiaxed transition. A comparatively deeper degree of melt pool penetration also enhanced the relative density of samples with CoAl 2 O 4 . Despite the occurrence of the balling phenomenon, the reduced Marangoni convection also contributed to less micro-humping and better continuity of the melt tracks that decreased the surface roughness by at least 16.7 pct. The addition of CoAl 2 O 4 to the powder feedstock significantly impacted the processing window of L-PBF processed Alloy 718 and may potentially be used as a means to engineer the microstructure.

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Viscosity measurements in semi-solid metal processing: current status and recent developments

Megalingam

Ahmad

Maarof

et al. 2021

Int J Adv Manuf Technol

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Investigating viscosity variations of molten aluminum by calcium addition and stirring

Cited by 16 publications

References 15 publications

Formation mechanism and three-point bending behaviour of directly fabricated aluminium foam plates

Formation mechanism and three-point bending behaviour of directly fabricated aluminium foam plates

Toward the Understanding of CoAl2O4 Additions on the Formation of Microstructure in Alloy 718 Processed by Laser Powder Bed Fusion

Viscosity measurements in semi-solid metal processing: current status and recent developments

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