Course detail

Dislocations and Plastic Deformation

FSI-WDDAcad. year: 2027/2028

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

Assignment to study programme types

Master's

Mode of study

Not applicable.

Learning outcomes of the course unit

Not applicable.

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.

Prerequisites and corequisites

Not applicable.

Basic literature

D. Hull and D.J. Bacon: Introduction to Dislocations, Butterworth-Heinemann, 2011 (EN)
Smallman R.E., Bishop R.J.: Metals and Materials, , 0

Recommended reading

P.M. Anderson, J.P. Hirth, J. Lothe : Theory of Dislocations, Cambridge University Press, 2017 (EN)
Ptáček L., Just D., Švejcar J.: Physics of metals (in Czech), , 0
Strnadel B.: Examples with solutions and technical problems from materials engineering (in Czech), , 0

Classification of course in study plans

  • Programme N-MTI-P Master's 1 year of study, summer semester, compulsory, profile core courses

Type of course unit

 

Lecture

26 hours, optionally

Teacher / Lecturer

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

Teacher / Lecturer

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.

E-learning texts

zadání cvičení
WDD 2021-1.zip 32.11 MB
WDD 2021-2.zip 20.58 MB
zadani cviceni.zip 10.99 MB
texty a prezentace k předmětu WDD - 1
WDD 2021-1.zip 32.11 MB
texty a prezentace k předmětu WDD - 2
WDD 2021-2.zip 20.58 MB
prezentace Krystalografie
uvod-krystalografie 2022.ppt 27.72 MB
prezentace k předmětu WDD - Mechanizmy plastické deformace
mechanismy 2022.pptx 17.5 MB
T. Kruml, prezentace Dislokace 2023
dislokace2023.ppt 7.76 MB