Teacher

prof. Stefano MASCHIO

Credits

6 CFU

Language

Italian

Objectives

At the end of the course, students should be able: to understand when a selected material is correctly prepared, to know its limits in use, to be able to select a particular class of materials for a particular application or use and optimize an existing materials by a quantitative and/or qualitative modification of the original components. Students must be able to evaluate, if it is possible, to modify its original crystallographic of microstructural structure in order to approach new mechanical performances.

Acquired skills

- To know if a material is properly prepared.
- To knowl about application limits of a specific material.
- Ability to select a specific class of materials for a particular application.
- Optimization of an existing material by technological processings, failure analysis.
- Optimization of a material by a quantitative modification of the components.
- Optimization of a material by a qualitative modification of the components.

Lectures and exercises (topics and specific content)

Elements of materials’ structure: chemical bonds; ionic, metallic, reticular and molecular solids; primary and secondary bonds; point and line defects: dislocations; polycrystalline and amorphous solids; solid solutions and alloys; kinetic effects; macro and micro defects; porosity; crystal structure and diffractometric analysis, theoretical, apparent and relative density (12 hours).
Phase diagrams: Gibb’s rule; one component phase diagrams; binary diagrams; euthectics, eutectoids a nd pertitectoids diagrams; intermediates components; non equilibrium phase transformations; compositions gradients during non equilibrium solidification processes and corresponding microstructural development (6 hours).
Tension strength: relations between microstructure and tension strength; influence of micro and macro bulk defects; effect of temperature, of loading cinetic and of material’ history (5 hours).
Compression strength: relations between microstructure and compression strength; influence of micro and macro bulk defects; effect of temperature, of loading cinetic and of materials’ history (4 hours).
Flexural strength: relations between microstructure and flexural strength; influence of micro and macro bulk defects; effect of temperature, of loading cinetic and of materials’ history (5 hours).
Elastic modulus: relations between microstructure and fractura toughness; influence of micro and macro bulk or surface defects; effect of temperature, of loading cinetic and of materials’ history (5 hours).
Fracture toughness: relations between microstructure and tension strength. Influence of micro and macro bulk defects; effect of temperature, of loading cinetic and of materials’ history (7 hours).
Hardness and microhardness: relations between microstructure and hardness; influence of micro and macro bulk defects; effect of temperature, of loading cinetic and of materials’ history (4 hours).
Fatigue resistance: relations between microstructure and fatigue or thermal fatigue resistance; relation between fatigue and fracture toughnerss; influence of surface defects; effect of temperature, of load cinetic and of materials’ history (4 hours).
Creep resistance: relations between microstructure and creep; influence of micro and macro defects; effect of temperature and load cinetic (4 hours).
Thermal shock resistance: relations between the mechano-physico properties of the materials and their behaviour against thermal shock (4 hours).
Exercises (16 hours).

References

- Teacher’s notes
- W.D. Callister, Scienza e tecnologia dei materiali. Una introduzione, Edises, Napoli 2002
- Smith-hashemi, Scienza e Tecnologia dei materiali-III ed-McGraw-Hill
- Meyers-Chawla, Mechanical behaviour of materials-II ed_Cambridge

Type of exam

Oral