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Investigation of the effect of fluid flow on microstructure evolution in Al-Si-Fe alloys: The MICAST project

Steinbach, Sonja and Ratke, Lorenz and Zimmermann, Gerhard and Sturz, Laszlo and Roosz, Andras and Kovacs, Jeno and Fautrelle, Yves and Budenkova, Olga and Lacaze, Jacques and Dost, Sadik and Grün, Gerd-Ulrich and Warnken, Nils and Wu, Menghuai and Sillekens, Wim (2017) Investigation of the effect of fluid flow on microstructure evolution in Al-Si-Fe alloys: The MICAST project. 6th Decennial International Conference on Solidification Processing, 25.-28. Juli 2017, Old Windsor, GB. ISBN 1908549297

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Abstract

In secondary Al-Si-alloys, the presence of small amounts of Fe causes the formation of Fe-intermetallic phases, which have a negative effect on mechanical and physical properties of castings. To understand the interaction of fluid flow and precipitating intermetallic phases and their effect on microstructure formation, unidirectional solidification experiments have been carried out on AlSi7 and AlSi7Fe1 alloys as a function of temperature gradient, G and growth rate, v under diffusive and controlled fluid flow conditions in the ESA payload Materials Science Lab (MSL) onboard the ISS. A strong segregation of Fe and Si towards the sample centre under convective conditions is observed. The influence of fluid flow and intermetallic phases on the solidifying microstructure was characterized by changes of primary and secondary dendrite arm spacing. In the pure binary alloy the secondary dendrite arm spacing increases under convective conditions, clearly revealing the dramatic effects of convections on solidification kinetics. Instead of a cube root relation it is observed that the secondary arms coarsen as the square root of solidification time. In contrast to this even small amounts of iron eliminate possible effects of flow on the secondary dendrite arm spacing. These results are explained from the viewpoint of the blocking effect of the Fe-intermetallic phases on fluid flow leading to a loss in permeability of the mushy zone and a decreased solute transfer.

Item URL in elib:https://elib.dlr.de/114070/
Document Type:Conference or Workshop Item (Speech)
Title:Investigation of the effect of fluid flow on microstructure evolution in Al-Si-Fe alloys: The MICAST project
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Steinbach, Sonjasonja.steinbach (at) dlr.deUNSPECIFIED
Ratke, Lorenzlorenz.ratke (at) dlr.deUNSPECIFIED
Zimmermann, Gerhardg.zimmermann (at) access-technology.deUNSPECIFIED
Sturz, Laszlol.sturz (at) access-technology.deUNSPECIFIED
Roosz, Andrasuniversity of miskolc, hungaryUNSPECIFIED
Kovacs, Jenouniversity of miskolc, hungaryUNSPECIFIED
Fautrelle, Yvessimap grenoble institute of technologyUNSPECIFIED
Budenkova, Olgasimap grenoble institute of technologyUNSPECIFIED
Lacaze, Jacquescirimat, toulouseUNSPECIFIED
Dost, Sadikuniversity of victoriaUNSPECIFIED
Grün, Gerd-Ulrichhydro aluminium deutschland gmbh, bonnUNSPECIFIED
Warnken, Nilsuniversity of birmingham, GBUNSPECIFIED
Wu, Menghuaiuniversity of leoben, austriaUNSPECIFIED
Sillekens, Wimestec, noordwijkUNSPECIFIED
Date:1 July 2017
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 267-271
Editors:
EditorsEmail
Fan, ZhongyunBCAST
ISBN:1908549297
Status:Published
Keywords:Dendrite Spacing´, Fluid flow, Al-Si alloys
Event Title:6th Decennial International Conference on Solidification Processing
Event Location:Old Windsor, GB
Event Type:international Conference
Event Dates:25.-28. Juli 2017
Organizer:BCAST
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 - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Materialforschung und Mikrogravitation (MuM)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Steinbach, Dr.rer.nat. Sonja
Deposited On:09 Oct 2017 07:29
Last Modified:09 Oct 2017 07:29

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