MATERIALS SCIENCE and ENGINEERING ME 202 ,

Atomic bonding in solids, bonding forces and energies, primary and secondary bonds. The structure of crystalline solids, lattice, unit cell, and crystal systems, density computation, crystal directions and planes, linear and planar atomic densities. Impurities and imperfections in solids: point, line and interfacial defects. Atomic vibration and diffusion. Mechanical properties of materials. Elastic and plastic deformation and recrystallization. Phase diagrams of single phase & multiphase materials with emphasis on iron-iron carbide system (steel & cast iron). Thermal processing of metals & alloys: annealing, normalizing, quenching and tempering, composite materials, polymers. Impact, fracture, fatigue and creep properties and introduction to fracture mechanics.

This course is to demonstrate knowledge of the basic concepts of structure and properties of materials, to apply this knowledge efficiently, and independently to analyze the structure and properties of different materials used in real engineering applications.

Unit 1: Introduction to Materials

Historical perspective, materials science and engineering, classification of materials, advanced materials, processing/structure/properties correlations.

Unit 2: Atomic Structure and Interatomic Bonding

Atomic structure fundamentals, electrons in atoms, the periodic table, bonding forces and energies, primary interatomic bonds, secondary bonding, materials of importance, molecules.

Unit 3: The Structure of Crystalline Solids

Crystal structure fundamentals, unit cells, metallic crystal structure, density computation n, polymorphism and allotropy, crystal systems, point coordinates, crystallographic directions and planes, linear and plane densities, close-packed structures, single crystals, polycrystalline materials, anisotropy, X-ray diffraction, non-crystalline solids.

Unit 4: Imperfections in Solids

Vacancies and self-interstitials, impurities in solids, specification of composition, dislocation-linear defects, interfacial defects, and volume defects, atomic vibrations, microscopy, grain size.

Unit 5: Diffusion

Diffusion mechanisms, steady and non-steady state diffusion, factors that influence diffusion, diffusion in semiconductors.

Unit 6: Mechanical Properties of Metals

Concepts of stress and strain, stress-strain behaviour, anelasticity, elastic properties of materials, tensile properties, true stress and strain, elastic recovery after plastic deformation, compressive, shear and torsional deformations, hardness, variability of materials properties, design/safety factors.

Unit 7: Phase Diagrams

Solubility limits, phases, microstructure, phase equilibria, unary phase diagrams, binary isomorphous systems, interpretation of phase diagrams, development of microstructure in isomorphous alloys, mechanical properties of isomorphous alloys, binary eutectic systems, development of microstructure in eutectic alloys, equilibrium diagrams with intermediate phases, eutectoid and peritectic reactions, congruent phase transformations, ceramic and ternary phase diagrams, the Gibbs phase rule, Fe-Fe3C phase diagram, development of microstructure in iron carbon alloys.

Unit 8: Structure and Properties of Ceramics

Crystal structures, silicate ceramics, carbon, carbon nanotubes, imperfections in ceramics, diffusion in ceramics, ceramic phase diagrams, brittle fracture, stress-strain behavior, mechanisms of plastic deformation.

Lab Experiment: Mechanical testing; Shear and bend tests

Unit 9: Polymer Structures

Hydrocarbon molecules, polymer molecules, the chemistry of polymer molecules, molecular weight, shape, structure and configuration, thermoplastic and thermosetting polymers, copolymers, polymer crystallinity, defects in polymers, diffusion in polymers.

Unit 10: Characteristics, Applications, and Processing of Polymers

Stress-strain behavior, macroscopic deformation, viscoelastic deformation, fracture, deformation of semi crystalline polymers, factors influencing mechanical properties, deformation of elastomers, crystallization, melting, the gas transition, melting and glass transition temperatures, plastics, elastomers, advanced polymeric materials, fibres, polymerization, polymer additive, forming techniques for plastics, fabrication of elastomers, fabrication of fibers and films