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Indian Institute of Technology Bombay

Defects in Materials

Indian Institute of Technology Bombay and NPTEL via Swayam


Defects play an important role in imparting properties to materials. It is also used to tailor the properties as well as in controlling the deformation behavior. Aim of this course is to give a brief introduction to the various types of defects and how their interaction can used to control the properties. 


Module 1  : Brief introduction to perfect crystals including lattice geometry, point group, space group and crystal structures
Module 2  : Defect classification in crystalline systems - Point defects in metallic ionic and covalent crystals equilibrium and non-equilibrium defects dislocations, continuum and atomistic theory, dislocations in different lattices,  dislocation reactions, interaction and multiplication of dislocations, dislocation sources, glide, cross slip, climb - Stacking faults, twinning - Grain boundaries, small angle and high angle boundaries, special boundaries, ledges, inter-phase boundaries.
Module 3  : Defect interactions - interaction between point defects and dislocations, interaction between precipitates and dislocations.
 Module 4 : Brief overview of role of defects in controlling optical, electrical, magnetic, semiconducting and superconducting properties of materials.
 Module 5  : Brief introduction to the role of dislocations in static and dynamic strain ageing, work hardening, strength of alloys, deformation of poly-crystals and fracture.
Module 6  : Brief introduction to techniques for characterization of defects.


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