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Full Record for Micrograph 1
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- Micrograph no
- 1
- Brief description
- Al 75, Cu 25 (wt%), hypoeutectic alloy
- Keywords
- alloy
, aluminium , copper, dendrite , hypoeutectic , lamella , metal - Categories
- Metal or alloy
- System
- Al-Cu
- Composition
- Al 75, Cu 25 (wt%)
- Standard codes
- Reaction
- Processing
- Sand cast
- Applications
- Sample preparation
- Etched in sodium hydroxide solution
- Technique
- Reflected light microscopy
- Length bar
- 40 μm
- Further information
- The micrograph shows primary Al dendrite arms (white). The dendrite trunk has been intersected at an angle by the plane of polishing to give the observed morphology. Between the dendrites is the Al - CuAl2 eutectic. Initially dendrites would have formed from the liquid, the regions between the dendrite arms known as the mushy zone transforming to a eutectic solid (L to Al + CuAl2). These two phases form cooperatively as neighbouring lamellae with the lateral diffusion of material across the growing interface. The relative amounts of the two phases (Al and CuAl2 ) within the eutectic are determined by applying the Lever Rule at the eutectic temperature.
- Contributor
- Prof T W Clyne
- Organisation
- Department of Materials Science and Metallurgy, University of Cambridge
- Date
- 25/10/01
- Licence for re-use
Attribution-NonCommercial-ShareAlike 4.0 International- Related micrographs