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Title : °C.

Description : This micrograph shows the grain structure of a roll-bonded aluminium alloy diffusion couple annealed for 60 minutes at 600°C. The upper half of the couple is Al-0.5Fe-1.0Mn (wt.%), the lower half is Al-1.0Si (wt.%). Annealing has recrystallised the microstructure. The Al-Fe-Mn alloy has many intermetallic particles (the dark phase). These help create recrystallisation nuclei, hence this alloy has a high density of small grains relative to the Al-Si alloy.The Barker's etch produces 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, hence the grain structure is imaged. Strain of the aluminium matrix during rolling around the intermetallic particles in the Al-Fe

Date : 2009-08-21T01:50:21+01:00

License : http://creativecommons.org/licenses/by-nc-sa/2.0/uk/

Publisher : Core-Materials

Creator :

Creator :

Subject : alloy

Subject : aluminium

Subject : diffusion couple

Subject : metal

Subject : recrystallisation

Subject : roll-bonding

Subject : DoITPoMS

Subject : University of Cambridge

Subject : micrograph

Subject : corematerials

Subject : ukoer