Materials - Imaging techniques
6 important questions on Materials - Imaging techniques
What can you do/get information about with optical microscopy?
- Crystallographic knowledge
- Phase identification
- Grain size
- Shape and distribution
- Presence of defects
- Mechanical deformations
- Amorphous components
How does a polarizing microscope work?
- Minerals reorient the planes in which light is vibrating -> some light passes through the polarizer
- Only the light scattered by defects and boundaries is observed above the dark background = colors visible
- The colors are different for each mineral
What can Metallographic analysis inform us about?
- Raw materials
- Production techniques and conditions
- Manufacturing methods
- Post-depositional corrosion
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About what can you gain information by the means of a polarizing microscope?
What are possible outputs of SEM?
- Backscattered electrons
- Secondary electrons (emitted by atoms after inonization process)
- Ionization = deeltjes een elektrische lading aanbrengen)
- Characteristic X-rays
- Light (cathodoluminescence)
X-ray CT scanner characteristics
- Used for imaging - more 3D view
- Does not measure composition
- Used on corroded/altered metals
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