Micrograph 605 and full record
- Micrograph no
- 605
- Brief description
- Fracture surface formed by hot tearing (solidification cracking)
- Keywords
- alloy , dendrite , hot tearing, metal, solidification cracking
- Categories
- Fracture, Metal or alloy
- System
- Al
- Composition
- Commercial purity (99.5%)
- Standard codes
- Reaction
- N/A
- Processing
- Specimen was cast into a 'dog-bone' mould, with a heated central region. Mould constraint during solidification set up tensile stresses which caused cracking in the central region while it was still partially liquid. The dendrite surfaces are smooth because they were separated by liquid films when cracking occurred. The plastically deformed necks were points where the liquid films were bridged at the time of separation.
- Applications
- Sample preparation
- Fracture surface
- Technique
- Scanning electron microscopy (SEM)
- Length bar
- 40 μm
- Further information
- Solidification cracking (hot tearing) is a significant problem when casting various alloys, particularly highly alloyed compositions with a relatively large freezing range. Impurities which lead to low melting point segregates can also cause this problem.
- Contributor
- Prof T W Clyne
- Organisation
- Department of Materials Science and Metallurgy, University of Cambridge
- Date
- 03/10/02
- Licence for re-use
- Attribution-NonCommercial-ShareAlike 4.0 International
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