Dissemination of IT for the Promotion of Materials Science (DoITPoMS)

DoITPoMS Micrograph Library Full Record for Micrograph 60
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Full Record for Micrograph 60

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Micrograph no
60
Brief description
Al, Si 12, Na 0.02 (wt%), eutectic alloy - refined microstructure
Keywords
alloy Link to MATTER Glossary entry for alloy, aluminium Link to MATTER Glossary entry for aluminium, eutectic Link to MATTER Glossary entry for eutectic, metal, modification Link to MATTER Glossary entry for modification, refined microstructure Link to MATTER Glossary entry for refined microstructure, silicon Link to MATTER Glossary entry for silicon, sodium
Categories
Metal or alloy
System
Al-Si-Na
Composition
Al, Si 12, Na 0.02 (wt%)
Standard codes
Reaction
Processing
As-cast (metal mould)
Applications
Sample preparation
Technique
Reflected light microscopy
Length bar
400 μm
Further information
This sample is a casting alloy of eutectic composition. The microstructure has been refined by modification through the addition of a small amount of sodium to the alloy composition. The large silicon plates have been altered to a more favourable fibrous form, leading to an enhancement of the mechanical properties due to the refinement of the microstructure. There is also a change to a planar interface during solidification, which minimises porosity in the casting.
Contributor
Prof T W Clyne
Organisation
Department of Materials Science and Metallurgy, University of Cambridge
Date
25/10/01
Licence for re-use
Attribution-Non-Commercial-Share Alike 2.0 UK: England & Wales
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