Hyperscript

Defects in Crystals

Topics for the Seminar 2011 /12

Hyperscripts of AMAT:
General Information

Index

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