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Micrograph 617 and full record
- Micrograph no
- 617
- Brief description
- Deeply etched Co-dendrites
- Keywords
- alloy
, cobalt, copper, deep-etched, dendrite , 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-NonCommercial-ShareAlike 4.0 International
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