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

DoITPoMS Micrograph Library Full Record for Micrograph 604

Full Record for Micrograph 604

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Micrograph no
604
Brief description
Extruded aluminium
Keywords
alloy Link to MATTER Glossary entry for alloy, aluminium Link to MATTER Glossary entry for aluminium, annealing Link to MATTER Glossary entry for annealing, cold swaging, elongation, extrusion Link to MATTER Glossary entry for extrusion, metal, recrystallisation Link to MATTER Glossary entry for recrystallisation
Categories
Metal or alloy
System
Al
Composition
Commercial purity (99.5%)
Standard codes
Reaction
N/A
Processing
Commercial purity (99.5%) aluminium has been atomised, cold compacted (20MPa), extruded, cold swaged (strain=0.75) and finally recrystallised for 1h at 600 degrees C
Applications
Extrusion is the process of forcing material through a die by means of a ram. It is suitable for forming components of constant section such as rods, tubes and films. Swaging is a subsequent reduction of cross section.
Sample preparation
The sample has been oxidised to provide colour contrast for different grain orientations.
Technique
Reflected light microscopy, polarised
Length bar
40 μm
Further information
Nucleation of the recrystallized grain structure is very sluggish in this material, but growth rates are rapid, giving rise to a coarse microstructure.
Contributor
Prof T W Clyne
Organisation
Department of Materials Science and Metallurgy, University of Cambridge
Date
03/10/02
Licence for re-use
Attribution-Non-Commercial-Share Alike 2.0 UK: England & Wales
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