Course detail

Metallic Materials

FCH-BCO_KOVAcad. year: 2015/2016

1.Metal bond – electric, thermal, optical properties. Comparison with covalent bond. Band theory. Origin of bands, width of band gap, conductivity, light reflection, periodic potential and effect of temperature 2. Close packing, basic types of crystal lattice, relations of unit cell and close packed planes, atomic packing factor.3. Miller´s indicies, groups of equivalent planes. 4. Categorization of metals according their properties, purity (terms base, baseic metal, alloying elements, impurities), according industrial production volumes. Common nonferrous metals and their use, categorization according melting temperature. Comparison with Van der Waals, covalent and ionic crystal. Polymorphism (examples of tin and iron). 5. Defects o lattices . Point defects – types, stable configurations, energy, formation, effect on electric, diffusion and mechanical properties. Dislocations – types, formation, energy. Interactions dislocation-point defect, dislocation – dislocation, dislocation – grain boundary. Effetcs on mechanical and chemical properties of grain boundaries, effect on hardening. Planar defects – grain boundaries, dislocation walls, twinning. Effects of twinning on mechanical properties. Formation of twins. 3-D defects – cavities etc. 6. Solid solutions – interstitial, substitutional. Ordering of structure, correspondence with structure of pure metal. Hume-Rothery rules. Intermetallic phases , categorization in consequence of Hume-Rothery rules mismatch. Interstitial compounds, Laves phases, electrochemical compounds, electron compounds (secondary solid solutions. Hume-Rothery phases), sigma phase. Fundamental properties and examples. 7. Gibbs energy, relationship wit temperature. Transformation temperature. Nucleation, energy balance. Crystal growth. Conditions of dendritic growth, segregation. TTT diagrams. 8. Equilibrium diagrams (miscibility in solid and liquid state, limits and changes of miscibility), eutectics – formation leading phase, morphology, composition, phase-like properties. 9. Phenomena in phasediagrams? Peritectical transformation, stoichiometric compound, secondary solid solution. Congruent and incongruent melting. Transfomation of one component of the mixture, its identification in phase diagram. Ternary diagrams – possible sections (isothermal, c = const., a:b = const). 10. Diffusion – mechanisms (Interstitial and vacancy), Fick´s laws, formula for semiinfinite body., error function. Diffusion coefficient evaluation, its dependence on temperature. Arrhenius equation parameters evaluation (activation energy, frequency factor). Meaning of diffusion (phase transformation), up-hil diffusion. 11. Martensite, sorbite, upper and lower bainite. Quenching, tempering. Continuous cooling diagram, isothermal transformation diagram, Quenchability, Jominy – end quench test. Requirements for quenching. Widmanstaeten structures. 12. Killing of steel and its consequences. Weldability, heat affected zone. Problems of welding of alloyed steels, stabilization. 13. Electrode potentials. Zinc and copper immersed in solutions of eigen cations. Standard conditions, salt bridge, SHE. Nernst equation. Oxygen and hydrogen depolarization. Theory of macrocells, microcells, theory of grain boundaries, charge fluctuations and kinetic theory of mixed potentials. Pourbaix digrams. Controlling of electrode potential.14. Categorization of corrosion – general, pitting, intercrystalline, transcrystalline, crevice corrosion. Diferrential aeration. 15. Corrosion tests. ISO 9227. 16. – 25. Metallography and other testing methods, categorization and number designation of industrial alloys.

Language of instruction

Czech

Number of ECTS credits

4

Mode of study

Not applicable.

Learning outcomes of the course unit

Successful graduate of the course is ready to:

1) Based on composition information, describe the phase composition, and chemical nature of phases present in an alloy.
2) Explain differences of structures of most common steel grades, estimate their fundamental properties (weldability, quenchability, tensile strength, corrosion resistance) according their standardized designation .
3) Describe the specifics of brasses, bronzes, duralumins and other nonferrous alloys.
4) Describe the basic meanings of research of metallic materials (metallography, analytic microscopy, corrosion tests, mechanical properties).

Prerequisites

General and inorganic chemistry I, II.
Structure of materials

Co-requisites

Not applicable.

Planned learning activities and teaching methods

The course uses teaching methods in form of Lecture - 2 teaching hours per week. The e-learning system (LMS Moodle) is available to teachers and students.

Assesment methods and criteria linked to learning outcomes

The examination is carried out in oral form (time for preparation is 15 minutes).
Student casts lots for random set of questions that cover all important areas of the subject (see content of the subject).
Essential requirement is the mastering of Fe-Fe3C phase diagram and reading of information in steel designation according to Czech national standards.
Student can obtain a bonus points for the exam at check-test and teamwork tasks at last two lectures.

Course curriculum

1. An introduction – pros and contras of metallic materials, topics of recent research, fundamental materials´ characteristics.
2. Metal bond – deduction by method MO-LCAO, properties. Arrangement of atoms in crystal lattice.
3. Real structures – defects, their formation and their meaning for chemical, corrosion and mechanical properties of materials.
4. Alloys – solid solutions, intermetallic compounds, Hume – Rothery rules for solid solutions (based on chemical nature of mixed metals). Properties of intermetallic compounds.
5. Equilibrium binary phase diagrams, derivation of composition of alloys.
6. Kinetics and thermodynamics of phase transformations. Diffusion, its mechanisms and quantitative description (during coating formation).
7. Electrochemical properties of metals, corrosion, high-temperature corrosion. Chemistry of corrosion products.
8. Corrosion protection – chemical technology of surface treatments and pretreatments.
9. Means of research of metallic materials, corrosion mechanisms and surface treatments.
10. Basic steel grades. Their composition and information contained in their standardized designation.
11. Nonferrous metals and their alloys: Copper, brasses, bronzes. Aluminum, duralumins.
12. Nonferrous metals and their alloys: Magnesium, zinc, titanium, chromium, nickel, Summary of other metals and their use.

Work placements

Not applicable.

Aims

Target audience is presented by students aimed on materials´ chemistry. Goal of the lecture is to introduce real metallic structures in the context of previously taught chemical disciplines. The secondary goal is then the knowledge of most important properties of materials, their practical use and systematic categorization of both ferrous and nonferrous alloys.

Specification of controlled education, way of implementation and compensation for absences

Subject is taught as lectures with voluntary attendance. According recent plan of study program there is no form of compulsory tasks in this subject.

Recommended optional programme components

Not applicable.

Prerequisites and corequisites

Not applicable.

Basic literature

L. Ptáček a kol.: Nauka o Materiálu I,II. CERM, Brno 2003. (CS)
W.D. Callister, Jr.: Materials Science and Engineering: An Introduction. 5th ed., John Wiley & Sons, Inc. 2000. (CS)

Recommended reading

M. Hluchý, O. Modráček, R. Paňák: Strojírenská technologie 1, 2.díl Metalografie a tepelné zpracování. Sciantia, s.r.o., Praha 1999. (CS)
P. Kratochvíl, P. Lukáč, B. Sprušil: Úvod do fyziky kovů I. SNTL, Praha 1984. (CS)
Z. Jonšta: Nauka o kovech II. VŠB-TU, Ostrava 2000. (CS)

Classification of course in study plans

  • Programme BPCP_CHCHT Bachelor's

    branch BPCO_CHM , 3 year of study, summer semester, compulsory-optional

  • Programme BKCP_CHCHT Bachelor's

    branch BKCO_CHM , 3 year of study, summer semester, compulsory-optional

  • Programme CKCP_CZV lifelong learning

    branch CKCO_CZV , 1 year of study, summer semester, compulsory-optional

Type of course unit

 

Lecture

26 hod., optionally

Teacher / Lecturer