Image icon  Cu 21, Sn 79 (wt%), peritectic transformation

 
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Description: This microstructure is generated via a peritectic reaction (L+ε = η), which bears some similarities to the more familiar eutectic reaction (L = α + β). Upon cooling from the liquid phase field, primary ε is formed, which can be seen here as a slightly darker phase than the sheath of η surrounding it. The η sheath is the product of a peritectic reaction between ε and liquid. The peritectic reaction rarely goes to completion, since the formation of η around the ε phase separates it from the liquid and inhibits further growth. Eventually, the remaining liquid transforms by a eutectic reaction to η and Sn. In this micrograph, the constituents of the eutectic mixture cannot be distinguished and it appears uniformly dark.
Keywords: alloy • bronze • copper • metal • peritectic reaction • tin
Categories: Science approaches > Microstructure
Materials > Metals & alloys > Copper & alloys
Testing, analysis & experimentation > Metallography
Scale > Micro
Created by: Prof T W Clyne, Department of Materials Science and Metallurgy, University of Cambridge
DoITPoMS, University of Cambridge
Published by: DoITPoMS, University of Cambridge
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Date created: 25 October 2001
Date added: 21 August 2009
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Resource ID: 1077