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Structure of Materials

Structure of Materials. Instructor: Dr. Anandh Subramaniam, Department of Materials Science and Engineering, IIT Kanpur. Atomic arrangement in crystalline solids, defects in crystalline solids, microstructure evolution, quantification of microstructures. Topics includes: bonding in materials; geometry of crystals: symmetry, lattices; Miller indices; crystal structures; defects in crystals; diffusion; phase diagrams; phase transformations; and effect of microstructure on properties. (from nptel.ac.in)

Lecture 26 - Defects in Crystals: Dislocations (cont.)

Dislocation climb, cross-slip of screw dislocations. Where can a dislocation line end? Positive and negative dislocations. Dislocations (Energy, dissociation, stress fields, dissociation, Interaction). Dislocations in CCP crystals (Shockley partial dislocations), dislocation loops and Frank partial dislocations. Dislocations in BCC crystals. Dislocations in ionic crystals. Formation of dislocations and typical values for dislocation densities. Burgers vectors for dislocations in cubic crystals. Slip systems in FCC, BCC and HCP crystal structures. Jogs and Kinks in dislocations. Dislocation-dislocation interactions (edge-edge, edge-screw, screw-screw).


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Lecture 01 - Overview
Geometry of Crystals: Symmetry, Lattices
Lecture 02 - Symmetry, Symmetry Operators, Point Groups and Space Groups
Lecture 03 - Solids, Definition of Crystal, Constructing 1D, 2D Crystals, Unit Cells
Lecture 04 - Review of Concepts related to Lattices, Motifs, Crystals and Unit Cells
Lecture 05 - 2D Lattices (cont.), Mystery of Missing Lattices
Lecture 06 - Space Filling, Sublattices and Subcrystals
Lecture 07 - 3D Lattices: 14 Bravais Lattices
Lecture 08 - 3D Lattices: 14 Bravais Lattices (cont.), Making Crystals: 1D
Lecture 09 - Making Crystals: 2D, 3D
Lecture 10 - Making Crystals: 3D (cont.), 7 Crystal Systems
Lecture 11 - 7 Crystal Systems (cont.), Ideal versus Real Crystals, Microstructure
Miller Indices
Lecture 12 - Microstructure (cont.), Miller Indices: Directions, Family of Directions
Lecture 13 - Miller Indices: Family of Planes, Miller-Bravais Indices
Crystal Structures
Lecture 14 - Miller Indices (cont.), Structure of Solids: Overview and Metallic Solids
Lecture 15 - Metallic Crystals
Lecture 16 - Metallic Crystals: Diamond Cubic, Packing Fraction, Atomic Density, Voids
Lecture 17 - Metallic Crystals: Voids (HCP), Voids in BCC Crystal
Lecture 18 - Addition of Alloying Elements: Segregation/Phase Separation, Solid Solution
Lecture 19 - Addition of Alloying Elements: Solid Solution (cont.), Intermediate Compounds
Lecture 20 - Revision of Intermediate Compounds, Crystalline Solids: Ionic Solids
Lecture 21 - Crystalline Solids (cont.), Defects in Crystals
Defects in Crystals
Lecture 22 - Defects in Crystals: Defect Structure, Point Defects
Lecture 23 - Defects in Crystals: Point Defects (cont.)
Lecture 24 - Defects in Crystals: Dislocations
Lecture 25 - Defects in Crystals: Dislocations (cont.)
Lecture 26 - Defects in Crystals: Dislocations (cont.)
Lecture 27 - Defects in Crystals: Dislocations (cont.)
Lecture 28 - Defects in Crystals: 2D Defects
Lecture 29 - Defects in Crystals: 2D Defects (cont.)
Diffusion in Solids
Lecture 30 - Diffusion in Solids: Kirkendall Effect, Fick's Laws
Lecture 31 - Diffusion in Solids: Atomic Mechanisms, Applications of Fick's II Law
Phase Diagrams
Lecture 32 - Phase Diagrams: Definition, The Gibbs Phase Rule
Lecture 33 - Phase Diagrams: Unary and Binary Phase Diagrams, Isomorphous System
Lecture 34 - Phase Diagrams: Tie Line and Lever Rule, Isomorphous Phase Diagrams
Lecture 35 - Phase Diagrams: Eutectic Phase Diagrams
Lecture 36 - Phase Diagrams: Peritectic Phase Diagrams, The Fe-Cementite Phase Diagram
Phase Transformations
Lecture 37 - Phase Transformations: Overview
Lecture 38 - Liquid to Solid Phase Transformation: Homogeneous Nucleation
Lecture 39 - Heterogeneous Nucleation, Time-Temperature-Transformation (TTT) Diagrams
Lecture 40 - Models for Computing Transformation Rate, Phase Transformations in Steel
Lecture 41 - Continuous Cooling Transformation (CCT) Curves
Lecture 42 - Hardness of Martensite, Overview of Heat Treatment
Lecture 43 - Alloy Steels, The Role of Alloying Elements, Precipitation Hardening
Lecture 44 - GP zones, Precipitate Coarsening, Glass transition
Lecture 45 - Recovery, Recrystallization and Grain Growth, Cold Work and its Effect on Properties