DoITPoMS

Full Record for Micrograph 423

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Micrograph no
423
Brief description
Commercial brass, ~30% Zn, displaying dendritic solidification
Keywords
alloy Link to MATTER Glossary entry for alloy, brass Link to MATTER Glossary entry for brass, copper, dendrite Link to MATTER Glossary entry for dendrite, metal, zinc
Categories
Metal or alloy
System
Cu-Zn   Link to phase diagram
Composition
Cu 70, Zn 30 (approx), Pb 1.3, Sn 0.5-1.0 (wt%)
Standard codes
Reaction
Processing
Chill cast
Applications
Sample preparation
Ammonium persulphate
Technique
Reflected light microscopy
Length bar
400 μm
Further information
An good example of dendritic solidification, which occurs when the solidification front becomes unstable with respect to small perturbations. This results in the growth of the perturbations, producing dendrites (from the Greek for tree). The variation in colour across the micrograph indicates that the cooling was sufficiently rapid to prevent solid state diffusion and hence a concentration variation. This phenomena is known as coring
Contributor
Dr R F Cochrane
Organisation
Department of Materials, University of Leeds
Date
04/09/02
Licence for re-use
Attribution-Non-Commercial-Share Alike 2.0 UK: England & Wales
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