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Micrograph 609 and full record

Link to image file for micrograph 609
Micrograph no
609
Brief description
The grain structure of extruded aluminium
Keywords
alloy Link to MATTER Glossary entry for alloy, aluminium Link to MATTER Glossary entry for aluminium, elongation, extrusion Link to MATTER Glossary entry for extrusion, metal
Categories
Metal or alloy
System
Al
Composition
Commercial purity (99.5%)
Standard codes
Reaction
N/A
Processing
Commercial purity (99.5%) aluminium has been extruded
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.
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
The extrusion process leads to the elongation of grains. This micrograph shows a longitudinal section with the extrusion direction lying horizontal. Some large subgrains (or groups of subgrains) are apparent, and some high angle boundary migration has occurred normal to the extrusion direction. Grains near the extrudate centre have a lower aspect ratio.
Contributor
Prof T W Clyne
Organisation
Department of Materials Science and Metallurgy, University of Cambridge
Date
03/10/02
Licence for re-use
Attribution-NonCommercial-ShareAlike 4.0 International
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