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Material Science And Engineering (21ME33)

VTU NOTES
Subject code
21ME33
Semester
3rd

Module - 1

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.

Module - 2

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.

Module - 3

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.

Module - 4

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.

Module - 5

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.