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|Link to this page:||http://core.materials.ac.uk/search/detail.php?id=1726|
|Description:||This is an example of a hypoeutectic alloy. On slow cooling the liquid first solidified at approximately 940°C as copper rich dendrites. The composition of the remaining liquid became increasingly rich in phosphorus until it solidified as a eutectic (8.38 wt% P) at the eutectic temperature of 714°C. Note that the dendrites are cored - the different contrast after etching indicated that the composition varies with position in the dendrites. This is caused by non-equilibrium solidification. The cooling rate was too rapid for equilibrium to be maintained between the solid and the liquid phases.
This alloy has no practical applications. Phosphor bronzes usually contain 5 wt% Sn for solid solution strengthening with 0.2 wt% P for interstitial solution strengthening. They have high strength and corrosion resistance and are usually used for springs.
|Keywords:||alloy • bronze • copper • coring • dendrite • hypoeutectic • metal • phosphorus|
|Categories:|| Science approaches > Microstructure
Materials > Metals & alloys > Copper & alloys
Testing, analysis & experimentation > Metallography
Scale > Micro
Dr J Marrow, Department of Materials Science, University of Manchester and UMIST
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). View the full legal code here.|
|Date created:||07 November 2002|
|Date added:||21 August 2009|