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|Description:||The micrograph shows Al-Mg-Fe-Si containing < 1wt.% of each solute; refined with TiB2 particles. Deformation of grain structure is due to cutting of sample with scissors. This micrograph illustrates the effect of deformation on a previously equiaxed structure. Strain causes the elongation of grains and the subsequent anodising produces 'mottled' grain colours; the oxide layer is not of constant orientation or thickness across a grain.
The Barker's etch and applied electrical field produce a thick oxide layer on the grains of aluminium (anodising). When viewed in cross-polarised light, interference in the oxide layer produces colours which depend on grain orientation and oxide thickness; hence the grain structure is imaged.
|Keywords:||alloy • aluminium • anodising • deformation • equiaxed • iron • magnesium • metal • silicon|
|Categories:|| Science approaches > Microstructure
Materials > Metals & alloys > Aluminium & alloys
Testing, analysis & experimentation > Metallography
Scale > Micro
DoITPoMS, University of Cambridge
T Quested, Department of Materials Science and Metallurgy, University of Cambridge
|Published by:||DoITPoMS, University of Cambridge||License:||This resource is released under the Creative Commons Attribution Non-Commercial Share Alike license (2.0 UK: England & Wales). View the full legal code here.|
|Date created:||20 January 2003|
|Date added:||21 August 2009|