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Defects in Crystalline Solids I

Defects in Crystalline Solids I. Instructor: Prof. Shashank Shekhar, Department of Materials Science and Engineering, IIT Kanpur. Crystalline materials show many properties and phenomena which are dependent on defects in the presence of defects. This course intends to explore the defects in crystalline materials and their effects on properties, primarily mechanical properties. At the end of the course, the student should be able to have a broad understanding of defects in materials and their role in determining properties of materials; have a thorough understanding of the structure of dislocations in various crystals and their elastic fields; and have an overview of plastic deformation mechanisms and the role of dislocations in plasticity, fracture, fatigue and creep. (from nptel.ac.in)

Introduction


Lecture 01 - Introduction to Defects
Lecture 02 - Equilibrium Points Defects
Lecture 03 - Energy of Vacancy Formation
Lecture 04 - Vacancy Concentration Measurement Techniques
Lecture 05 - Self-interstitial Defects, Frenkel Defects
Lecture 06 - Schottky Defects, Extrinsic Defects
Lecture 07 - Interstitials in Iron
Lecture 08 - Defects Reaction, Kroger-Vink Notation, Notation of Schottky Defect
Lecture 09 - Defects Reaction and its Thermodynamics
Lecture 10 - Equilibrium Concentration using Defects Reaction
Lecture 11 - Examples on Defect Reaction
Lecture 12 - Diffusion (Interstitial Diffusion)
Lecture 13 - Non-steady State Diffusion
Lecture 14 - Self Diffusion and Examples
Lecture 15 - Diffusion in Substitutional Alloys, Diffusion along Defects
Lecture 16 - History of Dislocations
Lecture 17 - Volterra Model, Structure of Dislocations, Burger Vectors
Lecture 18 - Characteristics of Dislocations
Lecture 19 - Mixed Dislocations, Dislocation Loops
Lecture 20 - Elastic Continuum Model, Strain Field for Screw Dislocations
Lecture 21 - Stress and Strain Fields
Lecture 22 - Stress State around Edge Dislocations, Elastic Energy of Dislocations
Lecture 23 - Glide Forces on Dislocations, Line Tension on Dislocations
Lecture 24 - Climb Forces on Dislocations, Interaction between Dislocations
Lecture 25 - Image Forces on Dislocations
Lecture 26 - Resistance to Dislocation Motion, Peierls Nabarro Valley
Lecture 27 - Slip System and Examples
Lecture 28 - Dislocations and Slips + Examples
Lecture 29 - Critical Resolved Shear Stress and Examples
Lecture 30 - Glide + Kinks
Lecture 31 - Cross Slip + Climb
Lecture 32 - Climb + Jogs
Lecture 33 - Examples on Jogs + Dislocation Intersection
Lecture 34 - Dislocation Intersection and Step Characteristics + Superjogs
Lecture 35 - Strain and Strain-rate due to Dislocation Motion + Velocity of Dislocations + Observation of Dislocations
Lecture 36 - Observation of Dislocations (cont.), Dislocation Dynamics
Lecture 37 - Dislocations in FCC Materials, Partial Dislocations
Lecture 38 - Partial Dislocations (cont.), Stacking Fault
Lecture 39 - Thompson Tetrahedron + Examples
Lecture 40 - Dislocations in BCC, Asymmetry of Slip

References
Defects in Crystalline Solids I
Instructor: Prof. Shashank Shekhar, Department of Materials Science and Engineering, IIT Kanpur. This course intends to explore the defects in crystalline materials and their effects on properties.