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Full Record for Micrograph 13
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- Micrograph no
- 13
- Brief description
- Cu 21, Sn 79 (wt%), peritectic transformation
- Keywords
- alloy
, bronze , copper, metal, peritectic reaction , tin - Categories
- Metal or alloy
- System
- Cu-Sn
- Composition
- Cu 21, Sn 79 (wt%)
- Standard codes
- Reaction
- Processing
- As-cast (sand mould)
- Applications
- Sample preparation
- Technique
- Reflected light microscopy
- Length bar
- 80 μm
- Further information
- This microstructure is generated via a peritectic reaction (L+e = eta), which bears some similarities to the more familiar eutectic reaction (L = a + b). Upon cooling from the liquid phase field, primary e is formed, which can be seen here as a slightly darker phase than the sheath of h surrounding it. The h sheath is the product of a peritectic reaction between e and liquid. The peritectic reaction rarely goes to completion, since the formation of h around the e phase separates it from the liquid and inhibits further growth. Eventually, the remaining liquid transforms by a eutectic reaction to h and Sn. In this micrograph, the constituents of the eutectic mixture cannot be distinguished and it appears uniformly dark.
- 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- Related micrographs