Full Record for Micrograph 634
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- Micrograph no
- 634
- Brief description
- Solid-gas eutectic solidification (Gasar) aluminium foam
- Keywords
- alloy , aluminium , aluminium foam, cell , composite foam, composite material , eutectic , foam , gas, Gasar, hydrogen, metal
- Categories
- Foam, Metal or alloy, Metal or alloy composite foam
- System
- Al
- Composition
- Not specified
- Standard codes
- Reaction
- Under controlled pressure, a gas-solid eutectic can be exploited to foam aluminium
- Processing
- Applications
- Closed cell aluminium foams are an ultra-light material, with potential structural applications in transport and construction. They may also be used in energy absorbing structures and heat exchangers
- Sample preparation
- Technique
- Photography (no microscope)
- Length bar
- 120 μm
- Further information
- 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.
- Contributor
- Dr V Gergely
- Organisation
- Department of Materials Science and Metallurgy, University of Cambridge
- Date
- 03/10/02
- Licence for re-use
- Attribution-NonCommercial-ShareAlike 4.0 International