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Microstructural Studies of A357 Alloy Cast By RSF Process

Ratke, Lorenz and Sharma, Ashok (2009) Microstructural Studies of A357 Alloy Cast By RSF Process. Transactions of the Indian Institute of Metals, 62 (4-5), pp. 327-330. Springer. ISSN 0972-2815.

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We studied rheocasting of an A357 ( Al-7Si-0.6Mg ) alloy using the Rapid Slurry Formation (RSF) technology developed by Rheometal. The technology is based on a so-called solid enthalpy exchange material (EEM). A cold piece of the same material is immersed into a melt bath and stirred in the melt which subsequently melts during stirring operation. This leads to a temperature reduction of the melt bath within a minute to a preset value between solidus and liquidus temperature at an also preset amount of fraction solid. Semi-solid slurries of A357 with around 30% solid fraction were produced in this way. The slurry formation was modified by adding several grain refiners ( Al-5Ti-1B, Al-3Ti-0.15C and Si-1B master alloys). Grain refiners were added individually a few minutes before start of the RSF process. Stirring speed was varied to study its effect on microstructure. The slurry so produced was quenched in water or cast into a heated stainless steel ring and compacted by a mild squeezing into a disc. The microstructures are analyzed with respect to grain size, grain density, aspect ratio and homogeneity, revealing an additional effect of grain refiners. The results are discussed with models of nucleation, growth and flow assisted coarsening.

Item URL in elib:https://elib.dlr.de/61099/
Document Type:Article
Title:Microstructural Studies of A357 Alloy Cast By RSF Process
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:November 2009
Journal or Publication Title:Transactions of the Indian Institute of Metals
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 327-330
Keywords:semi-solid, RSF, A357, grain refiner, microstructure
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Multi Material Design Strukturen (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Ratke, Prof. Lorenz
Deposited On:25 Nov 2009 10:48
Last Modified:26 Feb 2013 15:02

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