| VTU NOTES | |
|---|---|
|
Subject code |
21ME33 |
|
Semester |
3rd |
Structure of Materials Introduction: Classification of materials, crystalline and non-crystalline solids, atomic bonding Geometrical Crystallography: Symmetry elements: the operation of rotation, Proper and Improper rotation axes, Screw axes, Glide planes Crystal Structure: Crystal Lattice, Unit Cell, Planes and directions in a lattice, Planar Atomic Density, packing of atoms and packing fraction, Classification and Coordination of voids, Bragg’s Law Imperfections in Solids: Types of imperfections, Point defects: vacancies, interstitials, line defects, 2-D and 3D-defects, Concept of free volume in amorphous solids.
Physical Metallurgy Alloy Systems: Classification of Solid solutions, Hume- Rothery Rules Phase Diagrams: Gibbs Phase Rule, Solubility limit, phase equilibria and Phase Diagrams: Isomorphous systems, Invariant Binary Reactions, Lever Rule; important phase- diagrams, Iron-Carbon Diagram. Diffusion: Diffusion-Fick’s Laws, Role of imperfections in diffusion.
Nucleation and growth: Introduction to homogeneous and heterogeneous nucleation, critical radius for nucleation. Plastic Deformation: Slip, Twinning; Recovery- Recrystallization-Grain Growth, Introduction to Strengthening mechanisms. Lever rule and phase diagram. Heat treatment: Annealing, Normalizing, hardening, Tempering, Nitriding, Cyaniding, Induction Hardening and Flame Hardening, Recent advances in heat treat technology. TTT diagram, microstructural effects brought about by these processes and their influence on mechanical properties.
Surface coating technologies: Introduction, coating materials, coating technologies, types of coating, advantages and disadvantages of surface coating. Powder metallurgy: Introduction, Powder Production Techniques: Different Mechanical and Chemical methods, Characterization of powders (Particle Size and shape Distribution), Powder Shaping: Particle Packing Modifications, Lubricants and binders, Powder Compaction and process, Sintering and Application of Powder Metallurgy.
Materials Selection The need for material selection in design, the evolution of Engineering materials. The Design Process and Materials Data: Types of design, design tools and materials data, processes of obtaining materials data, materials databases Engineering Materials and Their Properties: The classes of engineering materials and their structure, material properties: mechanical properties, functional properties. Material Selection Charts: Selection criteria for materials, material property Charts, deriving property limits and material indices, materials indices which include shape.