The effect of melt conditioning on segregation of solute elements and nucleation of aluminium grains in a twin roll cast aluminium alloy

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@article{87c506eedcd4450295cc4a0b9514f2a8,
title = "The effect of melt conditioning on segregation of solute elements and nucleation of aluminium grains in a twin roll cast aluminium alloy",
abstract = "An aluminum alloy was cast by a laboratory scale horizontal twin roll caster with or without melt conditioning by the intensive shearing prior to solidification and then examined by high-resolution electron microscopy. The combined twin roll casting process with solidification formed channels and induced centerline segregation without the conditioning. In comparison, the melt conditioning minimized the severe segregation on the surface as well as at the centerline. Furthermore, large amounts of solute elements were uniformly distributed along grain boundaries or interdendritic regions. Analytical electron microscopy detected a fine oxide particle or a fragmented aluminum particle particularly at the center region of one nucleated aluminum grain. In addition, large oxide particles of about 1 to 5 μm nucleated aluminum grains easily due to low undercooling necessary for the heterogeneous nucleation, whereas small oxides with the size of about 100 to 200 nm requiring large undercooling were pushed along the grain boundaries instead of contributing to the nucleation. The enhanced nucleation of aluminum grains and well-distributed solute atoms in the melt by the melt conditioning resulted in the minimization of macro- and micro-segregations and the formation of a uniform microstructure.",
keywords = "Heterogeneous Nucleation, MgAl2O4, Twin Roll Casting, Twin Roll, High Casting Speed",
author = "KeeHyun Kim",
year = "2014",
month = sep,
day = "1",
doi = "10.1007/s11661-014-2414-y",
language = "English",
volume = "45",
pages = "4538--4548",
journal = "Metallurgical and Materials Transactions A",
issn = "1073-5623",
publisher = "ASM International",
number = "10",

}

RIS

TY - JOUR

T1 - The effect of melt conditioning on segregation of solute elements and nucleation of aluminium grains in a twin roll cast aluminium alloy

AU - Kim, KeeHyun

PY - 2014/9/1

Y1 - 2014/9/1

N2 - An aluminum alloy was cast by a laboratory scale horizontal twin roll caster with or without melt conditioning by the intensive shearing prior to solidification and then examined by high-resolution electron microscopy. The combined twin roll casting process with solidification formed channels and induced centerline segregation without the conditioning. In comparison, the melt conditioning minimized the severe segregation on the surface as well as at the centerline. Furthermore, large amounts of solute elements were uniformly distributed along grain boundaries or interdendritic regions. Analytical electron microscopy detected a fine oxide particle or a fragmented aluminum particle particularly at the center region of one nucleated aluminum grain. In addition, large oxide particles of about 1 to 5 μm nucleated aluminum grains easily due to low undercooling necessary for the heterogeneous nucleation, whereas small oxides with the size of about 100 to 200 nm requiring large undercooling were pushed along the grain boundaries instead of contributing to the nucleation. The enhanced nucleation of aluminum grains and well-distributed solute atoms in the melt by the melt conditioning resulted in the minimization of macro- and micro-segregations and the formation of a uniform microstructure.

AB - An aluminum alloy was cast by a laboratory scale horizontal twin roll caster with or without melt conditioning by the intensive shearing prior to solidification and then examined by high-resolution electron microscopy. The combined twin roll casting process with solidification formed channels and induced centerline segregation without the conditioning. In comparison, the melt conditioning minimized the severe segregation on the surface as well as at the centerline. Furthermore, large amounts of solute elements were uniformly distributed along grain boundaries or interdendritic regions. Analytical electron microscopy detected a fine oxide particle or a fragmented aluminum particle particularly at the center region of one nucleated aluminum grain. In addition, large oxide particles of about 1 to 5 μm nucleated aluminum grains easily due to low undercooling necessary for the heterogeneous nucleation, whereas small oxides with the size of about 100 to 200 nm requiring large undercooling were pushed along the grain boundaries instead of contributing to the nucleation. The enhanced nucleation of aluminum grains and well-distributed solute atoms in the melt by the melt conditioning resulted in the minimization of macro- and micro-segregations and the formation of a uniform microstructure.

KW - Heterogeneous Nucleation

KW - MgAl2O4

KW - Twin Roll Casting

KW - Twin Roll

KW - High Casting Speed

UR - http://www.scopus.com/inward/record.url?scp=84906783296&partnerID=8YFLogxK

U2 - 10.1007/s11661-014-2414-y

DO - 10.1007/s11661-014-2414-y

M3 - Article

AN - SCOPUS:84906783296

VL - 45

SP - 4538

EP - 4548

JO - Metallurgical and Materials Transactions A

JF - Metallurgical and Materials Transactions A

SN - 1073-5623

IS - 10

ER -