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Influence of rotation speed and holding time on Al-7Si alloy cast through rapid slurry formation (RSF) technique

Sharma, Ashok and Ratke, Lorenz and Kohli, Divya (2010) Influence of rotation speed and holding time on Al-7Si alloy cast through rapid slurry formation (RSF) technique. 50th International Foundry Conference, 8.-10. Sept. 2010, Ljubbljana, Slovenien.

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Abstract

The experimental investigation consisted of casting Al-7Si alloy by rapid slurry formation(RSF) technique. The RSF process is based on the enthalpy exchange between at least two alloy systems having different enthalpies, with the aim of forming a semi-solid metal slurry. Thus, slurry with 0.3 solid fraction was made by this process. Prior to starting the experiment 0.01 wt.% SiB was also added in the melt for additional grain refinement. Stirring speed was varied from 800 to 1800 rpm and for each experiment the samples were quenched in water at different time intervals; 0 min., 5 min., 10 min. and 15 min. It was observed that rapid heat extraction, nucleation and forced shearing action developed globular α-Al phase. It was also found that rotation speed, holding time and addition of Si-B grain refiner affected the average α-Al particle size. The coarsening of particles was experimentally investigated and also theoretically described by applying the LSW theory

Document Type:Conference or Workshop Item (Speech)
Title:Influence of rotation speed and holding time on Al-7Si alloy cast through rapid slurry formation (RSF) technique
Authors:
AuthorsInstitution or Email of Authors
Sharma, AshokUNSPECIFIED
Ratke, Lorenzlorenz.ratke@dlr.de
Kohli, DivyaUNSPECIFIED
Date:September 2010
Keywords:casting rheocasting, nucleation, grain refinement
Event Title:50th International Foundry Conference
Event Location:Ljubbljana, Slovenien
Event Type:international Conference
Event Dates:8.-10. Sept. 2010
Organizer:Slovenian Foundrymen Society
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles
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: Prof. Lorenz Ratke
Deposited On:02 Dec 2010 09:35
Last Modified:02 Dec 2010 09:35

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