Image icon  Solid-gas eutectic solidification (Gasar) aluminium foam

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Description: The metal to be foamed is melted in an autoclave with a controlled pressure of hydrogen, so that the melt becomes saturated with hydrogen. The melt is then directionally solidified and as it cools through the solid-gas eutectic point, it becomes supersaturated. A two phase solid/gas mixture is simultaneously formed from the melt, yielding an anisotropic porous solid with cylindrical pores oriented in the solidification direction.
Keywords: alloy • aluminium • aluminium foam • cell • composite foam • composite material • eutectic • foam • gas • Gasar • hydrogen • metal
Categories: Science approaches > Microstructure
Materials > Metals & alloys > Aluminium & alloys
Product Forms > Bulk > Foam
Testing, analysis & experimentation > Metallography
Scale > Micro
Created by: DoITPoMS, University of Cambridge
Dr V Gergely, Department of Materials Science and Metallurgy, University of Cambridge
Published by: DoITPoMS, University of Cambridge
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Date created: 03 October 2002
Date added: 21 August 2009
Resource ID: 1667