Precipitation of Sr-rich and Fe-rich intermetallic compounds in Al alloys

Ufuk Sahin; John Campbell; David N Brown; William D Griffiths

doi:10.1177/02670836241302686

Precipitation of Sr-rich and Fe-rich intermetallic compounds in Al alloys

Ufuk Sahin^*, John Campbell, David N Brown, William D Griffiths

^*Corresponding author for this work

Metallurgy and Materials

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Abstract

The precipitation of intermetallic compounds (IMCs) in an aluminium alloy Al-7Si-0.4Mg (A356) was studied, making additions of Fe, Sr, and Mg. The experiment avoided metallographic techniques, using a novel experimental approach in which the outside surface of the cast metal was studied. Precipitation of IMCs was observed to occur on the surface of oxide bifilms in suspension in the liquid metal, occasionally as a Sr-rich IMC growth from one side and a Fe-rich IMC growth from the other, corroborating the structure of the bifilm as having two wetted outer sides. The bifilms onto which heavy IMCs had precipitated were observed by nanotomography to sediment rapidly, indicating a potential method of cleaning secondary metals from both bifilms and metals like Fe.

Original language	English
Journal	Materials Science and Technology
Early online date	19 Dec 2024
DOIs	https://doi.org/10.1177/02670836241302686
Publication status	E-pub ahead of print - 19 Dec 2024

Keywords

oxide bifilm
precipitation
growth
sedimentation
aluminium alloys

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title = "Precipitation of Sr-rich and Fe-rich intermetallic compounds in Al alloys",

abstract = "The precipitation of intermetallic compounds (IMCs) in an aluminium alloy Al-7Si-0.4Mg (A356) was studied, making additions of Fe, Sr, and Mg. The experiment avoided metallographic techniques, using a novel experimental approach in which the outside surface of the cast metal was studied. Precipitation of IMCs was observed to occur on the surface of oxide bifilms in suspension in the liquid metal, occasionally as a Sr-rich IMC growth from one side and a Fe-rich IMC growth from the other, corroborating the structure of the bifilm as having two wetted outer sides. The bifilms onto which heavy IMCs had precipitated were observed by nanotomography to sediment rapidly, indicating a potential method of cleaning secondary metals from both bifilms and metals like Fe. ",

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author = "Ufuk Sahin and John Campbell and Brown, {David N} and Griffiths, {William D}",

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doi = "10.1177/02670836241302686",

language = "English",

journal = "Materials Science and Technology",

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TY - JOUR

T1 - Precipitation of Sr-rich and Fe-rich intermetallic compounds in Al alloys

AU - Sahin, Ufuk

AU - Campbell, John

AU - Brown, David N

AU - Griffiths, William D

PY - 2024/12/19

Y1 - 2024/12/19

N2 - The precipitation of intermetallic compounds (IMCs) in an aluminium alloy Al-7Si-0.4Mg (A356) was studied, making additions of Fe, Sr, and Mg. The experiment avoided metallographic techniques, using a novel experimental approach in which the outside surface of the cast metal was studied. Precipitation of IMCs was observed to occur on the surface of oxide bifilms in suspension in the liquid metal, occasionally as a Sr-rich IMC growth from one side and a Fe-rich IMC growth from the other, corroborating the structure of the bifilm as having two wetted outer sides. The bifilms onto which heavy IMCs had precipitated were observed by nanotomography to sediment rapidly, indicating a potential method of cleaning secondary metals from both bifilms and metals like Fe.

AB - The precipitation of intermetallic compounds (IMCs) in an aluminium alloy Al-7Si-0.4Mg (A356) was studied, making additions of Fe, Sr, and Mg. The experiment avoided metallographic techniques, using a novel experimental approach in which the outside surface of the cast metal was studied. Precipitation of IMCs was observed to occur on the surface of oxide bifilms in suspension in the liquid metal, occasionally as a Sr-rich IMC growth from one side and a Fe-rich IMC growth from the other, corroborating the structure of the bifilm as having two wetted outer sides. The bifilms onto which heavy IMCs had precipitated were observed by nanotomography to sediment rapidly, indicating a potential method of cleaning secondary metals from both bifilms and metals like Fe.

KW - oxide bifilm

KW - precipitation

KW - growth

KW - sedimentation

KW - aluminium alloys

U2 - 10.1177/02670836241302686

DO - 10.1177/02670836241302686

M3 - Article

SN - 0267-0836

JO - Materials Science and Technology

JF - Materials Science and Technology

ER -

Precipitation of Sr-rich and Fe-rich intermetallic compounds in Al alloys

Abstract

Keywords

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