CORE-Materials
Deeply etched dendrites (cobalt samarium copper)
DoITPoMS, University of Cambridge
Using this alloy composition, a relatively low volume fraction of pro-eutectic dendrites is formed. Due to their different chemistry the eutectic interdendritic Sm and Cu enriched phases material between these dendrites can be etched away to reveal the three-dimensional structure of dendrites. The dendrite tips are a volume have the form of a paraboloid of revolution, 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.
System
Co-Sm-Cu
Composition
Co 70, Sm 10, Cu 20 (at%)
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 eutectic material Sm and Cu enriched phases between the primary dendrites.
Technique
Scanning electron microscopy (SEM)
Contributor
Prof W Kurz
Organisation
Department of Materials, Swiss Federal Institute of technology (EPFL), Lausanne, Switzerland
Deeply etched dendrites (cobalt samarium copper)
DoITPoMS, University of Cambridge
Using this alloy composition, a relatively low volume fraction of pro-eutectic dendrites is formed. Due to their different chemistry the eutectic interdendritic Sm and Cu enriched phases material between these dendrites can be etched away to reveal the three-dimensional structure of dendrites. The dendrite tips are a volume have the form of a paraboloid of revolution, 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.
System
Co-Sm-Cu
Composition
Co 70, Sm 10, Cu 20 (at%)
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 eutectic material Sm and Cu enriched phases between the primary dendrites.
Technique
Scanning electron microscopy (SEM)
Contributor
Prof W Kurz
Organisation
Department of Materials, Swiss Federal Institute of technology (EPFL), Lausanne, Switzerland