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Thermally Activated Processes

Class at Faculty of Mathematics and Physics |
NFPL094

Syllabus

1. Recovery of point defects. Influence of point defects on physical properties of solids. Recovery spectra, recovery stages, kinetics of recovery.

2. Recovery of dislocation substructure and polygonisation. Evolution equation for dislocation density. Climb of dislocations, cross slip. Polygonisation.

3. Softening. Evolution equation for density of mobile dislocation and forest dislocations. Influence of hardening and softening processes on development of dislocation density. Macroscopic description of recovery by stress dependence of work hardening coefficient.

4. Recrystallisation. Static and dynamic recrystallisation. Models of nucleation. Grain boundary migration, coarsening of grains and subgrains. Recrystallisation of pure metals and alloys. Models of dynamic recrystallisation.

5. High temperature creep. Stress and temperature dependence of steady state strain rate. Influence of grain boundaries and stacking fault energy. Creep in pure metals, solute solutions, precipitation and dispersion hardened alloys. Climb of dislocations. Motion of dislocations with jogs - models of dislocation creep. Models difussional creepu.

6. Hardening after irradiation. Influence of irradiation with high energy particles on yield stress. Influence of thermal treating after irradiation on mechanical properties. Interaction of dislocation with irradiation defects. Models for hardening and creep.

7. Superplasticity. Characteristics of superplastic behaviour. Influence of experimental conditions and microstructure. Superplasticity in alloys, ceramics and composits.

Annotation

Recovery of point defects, recovery of dislocation substructure, recrystallisation. Hardening after irradiation by high energetic particles.

Superplasticity. High temperature creep.