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Formation of intermetallic phases in AlSi7Fe1 alloy processed under microgravity and forced fluid flow conditions and their influence on the permeability

Steinbach, Sonja and Ratke, Lorenz and Zimmermann, Gerhard and Budenkova, Olga (2016) Formation of intermetallic phases in AlSi7Fe1 alloy processed under microgravity and forced fluid flow conditions and their influence on the permeability. IOP Conference Series : Materials Science and Engineering, 117 (1), 012019. Institute of Physics (IOP) Publishing. doi: 10.1088/1757-899X/117/1/012019. ISSN 1757-8981.

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Official URL: http://stacks.iop.org/1757-899X/117/i=1/a=012019

Abstract

Ternary Al-6.5wt.%Si-0.93wt.%Fe alloy samples were directionally solidified on-board of the International Space Station ISS in the ESA payload Materials Science Laboratory (MSL) equipped with Low Gradient Furnace (LGF) under both purely diffusive and stimulated convective conditions induced by a rotating magnetic field. Using different analysis techniques the shape and distribution of the intermetallic phase β-Al 5 SiFe in the dendritic microstructure was investigated, to study the influence of solidification velocity and fluid flow on the size and spatial arrangement of intermetallics. Deep etching as well as 3-dimensional computer tomography measurements characterized the size and the shape of β-Al 5 SiFe platelets: Diffusive growth results in a rather homogeneous distribution of intermetallic phases, whereas forced flow promotes an increase in the amount and the size of β-Al 5 SiFe platelets in the centre region of the samples. The β-Al 5 SiFe intermetallics can form not only simple platelets, but also be curved, branched, crossed, interacting with dendrites and porosity located. This leads to formation of large and complex groups of Fe-rich intermetallics, which reduce the melt flow between dendrites leading to lower permeability of the mushy zone and might significantly decrease feeding ability in castings.

Item URL in elib:https://elib.dlr.de/103737/
Document Type:Article
Title:Formation of intermetallic phases in AlSi7Fe1 alloy processed under microgravity and forced fluid flow conditions and their influence on the permeability
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Steinbach, SonjaDLR, MPUNSPECIFIED
Ratke, LorenzDLR, WFUNSPECIFIED
Zimmermann, GerhardACCESS, AachenUNSPECIFIED
Budenkova, OlgaSIMAP Grenoble Institute of TechnologyUNSPECIFIED
Date:1 April 2016
Journal or Publication Title:IOP Conference Series : Materials Science and Engineering
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:No
In ISI Web of Science:No
Volume:117
DOI :10.1088/1757-899X/117/1/012019
Page Range:012019
Publisher:Institute of Physics (IOP) Publishing
ISSN:1757-8981
Status:Published
Keywords:solidification, Al-Si-Fe alloy, permeability, intermetallic phases, fluid flow
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Research under Space Conditions
DLR - Research theme (Project):R - Vorhaben Materialforschung unter Mikro-g (old), R - Vorhaben Materialwissenschaftliche Forschung (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space > Scientific Experiments MP
Deposited By: Steinbach, Dr.rer.nat. Sonja
Deposited On:11 Apr 2016 07:17
Last Modified:08 Mar 2018 18:53

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