653-0920/02 – Theory of Phase Transformations (TFP)
| Gurantor department | Department of Materials Engineering and Recycling | Credits | 10 |
| Subject guarantor | prof. Ing. Vlastimil Vodárek, CSc. | Subject version guarantor | prof. Ing. Vlastimil Vodárek, CSc. |
| Study level | postgraduate | Requirement | Choice-compulsory type B |
| Year | | Semester | winter + summer |
| | Study language | Czech |
| Year of introduction | 2022/2023 | Year of cancellation | |
| Intended for the faculties | FMT | Intended for study types | Doctoral |
Subject aims expressed by acquired skills and competences
The course is focused on basic theoretical rules of phase transformations which can take place during production and subsequent treatment of metallic materials. The goal of the course is to train students in identification of transformation products in metallic materials and to define a probable mechanism of phase transformations taking place under given circumstances of technological treatment of materials.
Teaching methods
Lectures
Individual consultations
Summary
The course deals with basic thermodynamic, kinetic and crystallographic characteristics of phase transformations in metallic materials. Phase transformations in technically important alloys are demonstrated on practical examples.
Compulsory literature:
Recommended literature:
Way of continuous check of knowledge in the course of semester
Oral exam with the written preparation.
E-learning
Other requirements
There are no further special requirements.
Prerequisities
Subject has no prerequisities.
Co-requisities
Subject has no co-requisities.
Subject syllabus:
Structure of crystalline materials. Allotropy in pure metals.
Structure of binary alloys, substitutional solid solutions, short range and long range ordering, interstitial solid solutions, intermediary phases, electron compounds, Laves phases and electrochemical compounds.
Thermodynamics of phase transformations, one-component systems, effect of pressure on equilibrium. Binary solutions: ideal solutions, chemical potential, regular solutions, activity, equilibrium in heterogeneous systems, relationship between binary diagrams and Gibbs free energy curves, influence of interfaces on equilibrium.
Kinetics of phase transformations. Arrhenius equation.
Classification of phase transformations. First order and second order transformations.
Solidification. Nucleation in pure metals: homogeneous and heterogeneous nucleation, growth of thermal dendrites in pure metals, solidification of single-phase alloys.
Solidification of binary alloys. Constitutional undercooling, dendritic growth, solidification of eutectic alloys, solidification of hypoeutectic and peritectic alloys, examples of solidification.
Diffusional transformations in solids. Precipitation: homogeneous and heterogeneous nucleation in solids, nucleation rate, growth and coarsening of precipitates, precipitation sequence, precipitation in age-hardening alloys. Discontinuous and continuous precipitation, interphase transformation.
Thermodynamic and kinetic modelling of precipitation reactions. Kinetics of diffusional phase transformations: Johnson-Mehl-Avrami equation. TTT and CCT diagrams.
Crystal interfaces in solids: coherent, semi-coherent and incoherent interfaces. Glissile interfaces. Interface migration.
Homogeneous transformation: spinodal decomposition. Mechanisms of ordering transformations. Massive transformations.
Difussionless phase transformations. Athermal and isothermal transformations. Martensite nucleation and growth. Shape deformation at martensitic transformation, habit plane. Martensite crystallography in Fe – C alloys. Bain deformation. Martensite morphology in Fe – C alloys. Tempering of martensite in steels, tempering embrittlement. Bainitic transformation.
Deformation induced martensitic transformation. Thermoelastic martensitic transformation, self–accommodation martensite. Transformation and reorientation induced pseudoelasticity. Shape memory effect.
Phase transformations in titanium and its alloys.
Conditions for subject completion
Occurrence in study plans
Occurrence in special blocks
Assessment of instruction
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