Materials Technology

Unit 1

Basics of Materials Structure: crystal systems – space lattice – miller indices of atomic planes and directions – small problems in crystallography – crystal defects point, line and surface defects. Mechanical Behaviour of Materials: stress-strain curve – elastic deformation - characteristics of elastic deformation - atomic mechanism of elastic deformation - inelastic deformation - strain time curves – viscous deformation - plastic deformation - slip and twinning - Schmidt’s law - critical resolved shear stress – Strengthening mechanisms; work hardening - grain boundary hardening, dispersion hardening.

Unit 2

Mechanical Testing and Fracture of Materials: Tensile test - stress–strain curves for ductile and brittle materials – proof stress – Compression test – Hardness test – Impact test – Fatigue test – S-N curve – Creep; primary, secondary and tertiary creep - Fracture: Ideal fracture stress – brittle fracture – Griffith’s theory cup and cone type fracture Phase Diagrams: solid solution – intermetallic compound, cooling, curves, non-equilibrium cooling - phase rule - Equilibrium diagrams – isomorphous - eutectic, peritectic and eutectoid reactions with examples - Iron-Iron carbide phase diagram.

Unit 3

Engineering materials: steels and cast irons - properties and applications - Heat treatment of steels: Annealing – Normalizing Hardening -Tempering matempering – Austempering – Hardenability and its testing – TTT diagram – Surface hardening of steels – carburising, nitriding, induction hardening. Effect of alloying elements on steel - Non-ferrous alloys – copper-aluminum – Magnesium, nickel and zincComposite materials – Ceramics