Dissemination of IT for the Promotion of Materials Science (DoITPoMS)

DoITPoMS Micrograph Library Micrograph 617 and full record

Micrograph 617 and full record

Link to image file for micrograph 617
Micrograph no
617
Brief description
Deeply etched Co-dendrites
Keywords
alloy Link to MATTER Glossary entry for alloy, cobalt, copper, deep-etched, dendrite Link to MATTER Glossary entry for dendrite, etching Link to MATTER Glossary entry for etching, metal, samarium
Categories
Metal or alloy
System
Co-Sm-Cu
Composition
Co 70, Sm 10, Cu 20 (at%)
Standard codes
Reaction
Processing
Directionally solidified in a Bridgman apparatus
Applications
Sample preparation
After directional solidification the cobalt-samarium-copper alloy has been deeply etched with 10% nitric acid in ethyl alcohol (10%Nital) to remove the Sm and Cu enriched phases between the primary dendrites.
Technique
Scanning electron microscopy (SEM)
Length bar
80 μm
Further information
Using this alloy composition, a relatively low volume fraction of dendrites is formed. Due to their different chemistry the interdendritic Sm and Cu enriched phases can be etched away to reveal the three-dimensional structure of dendrites. The dendrite tips have the form of a paraboloid, and anisotropy develops behind them with the secondary dendrite arms.

See R. Glardon, W. Kurz, "Solidification path and phase diagram of directionally solidified Co-Sm-Cu alloys", J. Cryst. Growth, 51 (1981) 283-291.
Contributor
Prof W Kurz
Organisation
Department of Materials, Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland
Date
03/10/02
Licence for re-use
Attribution-Non-Commercial-Share Alike 2.0 UK: England & Wales

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