Image icon  Commercial brass, ~30% Zn, displaying dendritic solidification

 
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Description: A 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 phenomenon is known as coring.
Keywords: alloy • brass • copper • dendrite • metal • zinc
Categories: Science approaches > Microstructure
Materials > Metals & alloys > Copper & alloys
Materials > Metals & alloys > Other metals & alloys > Zinc & alloys
Testing, analysis & experimentation > Metallography
Scale > Micro
Created by: Dr R F Cochrane, Department of Materials, University of Leeds
DoITPoMS, 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).
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Date created: 04 September 2002
Date added: 21 August 2009
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Resource ID: 1457