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HyperscriptDefects in Crystals© H. Föll Topics for the Seminar 2011 /12 |
Hyperscripts of AMAT: General Information Index |
Topics |
Group | Date | ||
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Thermodynamics of Point Defects in Ionic Crystals described by Mass Action Law | |||
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Explain the extension of the mass actio law to defects. Discuss shortly the problems with notation (Schottky, Kröger-Vink) | |||
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Give a simple example for the application to ionic crystals | |||
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Give a more complex example involving Brouwer diagrams | |||
All necessary information can be found in the hyperscript. | ||||
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Point defects in iron and steel | |||
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Present and discuss the available data for vacancies and self interstitial in bcc and fcc iron (ferrite and austenite). | |||
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Discuss the influence of magnetization on diffusion. | |||
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Present and discuss the available data for carbon interstitials in bcc and fcc iron (ferrite and austenite). | |||
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Consequences for the processing of steel. | |||
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Dislocations and Plastic
Deformation in Hexagonal Crystals |
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Describe the specialities of plastic deformation in hex. crystals as a function of the crystal and defect symmetry | |||
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Give examples, discuss the technical importance. | |||
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Dislocations and Plastic
Deformation in bcc Crystals |
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Describe the specialities of plastic deformation in bcc crystals. Consider glide systems, the role of screw dislocations | |||
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Consider low temperature deformation; twinning as a deformation mode | |||
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Applications, state of the art, outlook | |||
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Defects in Quasicrystals
(Nobel Prize 2011) |
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History, general background for periodic tilings in 2 Dimensions | |||
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Quasicrystal as projections from 6-dim. crystals | |||
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Point defects and diffusion, Phasons and quasi-dislocations, State of the art and problems |