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Thermally Activated Processes - NFPL094

Title:	Tepelně aktivované procesy
Guaranteed by:	Department of Physics of Materials (32-KFM)
Faculty:	Faculty of Mathematics and Physics
Actual:	from 2018
Semester:	winter
E-Credits:	3
Hours per week, examination:	winter s.:2/0, Ex [HT]
Capacity:	unlimited
Min. number of students:	unlimited
4EU+:	no
Virtual mobility / capacity:	no
State of the course:	not taught
Language:	Czech, English
Teaching methods:	full-time
Teaching methods:	full-time

Guarantor:	doc. Dr. rer. nat. Robert Král, Ph.D.
Classification:	Physics > Solid State Physics

Opinion survey results Examination dates Schedule Noticeboard

Annotation -

Last update: doc. Dr. rer. nat. Robert Král, Ph.D. (17.02.2013)

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

Course completion requirements -

Last update: doc. Dr. rer. nat. Robert Král, Ph.D. (09.06.2019)

Final examination has to be passed.

Literature - Czech

Last update: doc. Dr. rer. nat. Robert Král, Ph.D. (09.06.2019)

1. V. Sedlaček a kol.: Zotavení a rekrystalizace, Academia, Praha 1985

2. J. Čadek: Creep kovových materiálů. Academia, Praha

3. P. Lukáč: Superplasticita. Pokroky matematiky, fyziky a astronomie

4. F. J. Humphreys, M. Hatherly: Recrystallization and Related Annealing Phenomena, Pergamon Press, Oxford 1996.

Requirements to the exam -

Last update: doc. Dr. rer. nat. Robert Král, Ph.D. (09.06.2019)

Requirements for the exam correspond to the annotation.

The exam is oral.

Syllabus -

Last update: T_KFK (22.05.2003)

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.