Course detail

Dislocations and Plastic Deformation

FSI-WDD Acad. year: 2027/2028 Summer semester

This course focuses on explaining the mechanisms of elastic and plastic deformation in singlecrystalline and polycrystalline materials, primarily metals and alloys. A key aspect is explaining the causes of the mechanisms of alloy strengthening using dislocaton theory: substitution and interstitial strengthening, strain hardening, and precipitation hardening. 

Language of instruction

Czech

Number of ECTS credits

5

Supervisor

prof. Mgr. Tomáš Kruml, CSc.

Department

Institute of Materials Science and Engineering

Entry knowledge

Atomic bonds, fundamentals of crystallography, crystal lattice defects, basic mechanical properties of materials including measuring methods.

Rules for evaluation and completion of the course

Credit:
The condition for obtaining credit is the attendance at of exercises and written assignments of some chosen tasks. Exercises are mandatory. Absence from exercises must be excused. In case of absence, the student will receive a substitute assignment and must prove that he/she has mastered the given topic in the form of a written report.

Exam:

The exam has a written and an oral part. A credit is required to take the exam. The written part includes some examples and a test of knowledge of concepts. Students may not use any materials or devices except a calculator. The oral part may contain questions for which the student will be given time to prepare; however, it is primarily a test of the student's knowledge and orientation in the form of several questions with answers without preparation.

Aims

The course concentrates on explaining the essence of the mechanical properties of metallic and non-metallic substances, in dependence on the faulted crystal lattice. Information is provided about the mechanisms of plastic deformation in single-crystal and polycrystalline materials, deformation textures, and strain hardening. In the exercises, students learn the experimental methods for studying plastic deformation.
The knowledge of the processes of plastic deformation in crystals. Relation between sub-microscopic events in solids and macroscopic manifestation of these events – i.e. changes in mechanical properties.

Study aids

Under the link Textbooks, one can find and download teaching texts and presentations that contain links to additional study materials.

The study programmes with the given course

Programme N-MTI-P: Materials Engineering, Master's, compulsory

Type of course unit

 

Lecture

26 hours, optionally

Syllabus


  • Mechanisms of Elastic Deformation (Enthalpic and Entropic Elasticity)

  • Review of Crystallography, Stereographic Projection

  • Review of Calculations in Linear Elasticity

  • Basic Properties of Dislocations

  • Full Dislocations, Partial Dislocations, Superdislocations

  • Dislocation Interactions and Dislocation Reactions

  • Slip systems in fcc, bcc, and hcp

  • Internal and effective stresses

  • Fundamentals of thermal activation theory

  • Orowan’s equation

  • Strengthening mechanisms

  • Twinning and plasticity due to phase transformation (TWIP, TRIP)

  • Calculations in materials science

  • Specific mechanisms at work in common metals and alloys

Laboratory exercise

26 hours, compulsory

Syllabus

1. Stereographic projection, orientation of crystals. 2. Reciprocal lattice (definition, application). 3. Radiographic methods of studying crystal orientation. 4. Methods for studying textures, pole figures. 5. Electron diffractography. 6. Methods for establishing dislocation density. 7. Metallography of dislocation substructure.