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

DoITPoMS Micrograph Library Micrograph 48 and full record

Micrograph 48 and full record

Link to image file for micrograph 48
Micrograph no
48
Brief description
Al 95, Cu 5 (wt%), microsegregation - cored dendrites
Keywords
alloy Link to MATTER Glossary entry for alloy, aluminium Link to MATTER Glossary entry for aluminium, copper, coring Link to MATTER Glossary entry for coring, dendrite Link to MATTER Glossary entry for dendrite, metal, microsegregation Link to MATTER Glossary entry for microsegregation
Categories
Metal or alloy
System
Al-Cu   Link to phase diagram
Composition
Al 95, Cu 5 (wt%)
Standard codes
Reaction
Processing
As-cast (sand mould)
Applications
Sample preparation
Technique
Reflected light microscopy
Length bar
80 μm
Further information
This sample shows kappa-Al dendrites surrounded by a fine eutectic in which the two phases, kappa and θ (AlCu) cannot be resolved optically. The θ phase is non-equilibrium and is present due to microsegregation during solidification. This occurs at the beginning of solidification when the solid is low in solute creating 'cored' dendrites and leaving a solute-enriched liquid.
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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