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Introduction to Materials Science and Engineering

Introduction to Materials Science and Engineering. Instructor: Prof. Rajesh Prasad, Department of Applied Mechanics, IIT Delhi. This course is designed as a first introduction to microstructure and mechanical properties of engineering materials for undergraduate engineering students. The focus will be on clear presentation of basic fundamentals of structure and defects of crystalline materials. This will then be used to understand the transformations, heat treatments and mechanical behavior of structural materials. The course will also include several classroom and laboratory demonstrations. The course will also be useful as an introduction to materials science for engineers and scientists in industry, research labs and academic institutions. (from nptel.ac.in)

Lecture 92 - Nucleation, Growth and Overall Transformation


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Crystallography
Lecture 01 - Introduction
Lecture 02 - Crystal Geometry
Lecture 03 - Unit Cell
Lecture 04 - Classification of Lattices
Lecture 05 - Gaps in Bravais Lattices
Lecture 06 - Symmetry
Lecture 07 - Symmetry (cont.)
Lecture 08 - Classification of Lattices on the Basis of Symmetry
Lecture 09 - A Symmetry based Approach to Bravais Lattices
Crystallography, Structure of Solids
Lecture 10 - Miller Indices of Directions
Lecture 11 - Miller Indices for Planes
Lecture 12 - Miller Indices for a Plane and its Normal in Cubic Crystal
Lecture 13 - Weiss Zone Law and its Applications
Lecture 14 - Interplanar Spacing
Lecture 15 - Bragg's Law
Lecture 16 - Close-Packing of Hard Spheres
Lecture 17 - ABAB Stacking: Hexagonal Close-Packed (HCP) Structure
Lecture 18 - HCP Crystal Revised: Fractional Coordinates of Atoms in the Motif
Lecture 19 - C/A Ratio of an Ideal HCP Crystal
Lecture 20 - ABCABC Stacking: Cubic Close-Packing (CCP)
Structure of Solids
Lecture 21 - Voids in Close-Packed Structures
Lecture 22 - Solid Solutions
Lecture 23 - Solid Solutions (cont.)
Lecture 24 - Hume-Rothery Rules
Lecture 25 - Ordered and Disordered Solid Solutions
Lecture 26 - Graphene
Lecture 27 - Structure of Graphite
Lecture 28 - Structure of Diamond
Lecture 29 - Carbon Nanotubes (CNT)
Lecture 30 - Buckminsterfullerene (C60)
Lecture 31 - Ionic Solids
Lecture 32 - NaCl
Lecture 33 - CsCl
Lecture 34 - ZnS
Lecture 35 - BCC vs CsCl
Lecture 36 - Amorphous Solids
Lecture 37 - Polymers
Lecture 38 - Vinyl Polymers
Lecture 39 - Thermoplastics and Thermosets
Lecture 40 - Tacticity
Lecture 41 - Copolymers
Lecture 42 - Crystallinity in Polymers
Defects in Crystalline Solids
Lecture 43 - Defects in Crystals
Lecture 44 - Vacancies
Lecture 45 - Edge Dislocation: Half Plane
Lecture 46 - Edge Dislocation: Slip
Lecture 47 - Characteristic Vectors of a Dislocation
Lecture 48 - Edge, Screw and Mixed Dislocations
Lecture 49 - Screw Dislocations
Lecture 50 - Burgers Circuit
Lecture 51 - Elastic Energy of a Dislocation Line
Lecture 52 - Burgers Vector: Shortest Lattice Translation
Lecture 53 - Burgers Vector of a Dislocation is Constant along the Line
Lecture 54 - Dislocation cannot End Abruptly in a Crystal: Free Surface
Lecture 55 - Dislocation cannot End Abruptly in a Crystal: Grain Boundaries
Lecture 56 - Dislocation cannot End Abruptly in a Crystal: Dislocation Nodes
Lecture 57 - Dislocation cannot End Abruptly in a Crystal: Dislocation Loop
Lecture 58 - Dislocation Motion
Lecture 59 - 2D Defects: Surfaces or Interfaces
Lecture 60 - Free Surface or External Surface of a Crystal
Lecture 61 - Stacking Faults
Lecture 62 - Twin Boundary
Lecture 63 - Grain Boundary
Lecture 64 - Small Angle Symmetric Tilt Boundary
Lecture 65 - Ball Bearing Model
Phase Diagrams
Lecture 66 - Phase Diagrams: Introduction
Lecture 67 - Phase and Components
Lecture 68 - Uses of Phase Diagrams
Lecture 69 - Phases Present in the System
Lecture 70 - Composition of Phases Present in the System
Lecture 71 - Proportion of Phases Present in the System
Lecture 72 - Microstructure Evolution during Solidification in Isomorphous Systems
Lecture 73 - Eutectic System
Lecture 74 - Eutectic Reaction
Lecture 75 - Eutectic, Hypoeutectic and Hypereutectic Alloys
Lecture 76 - Gibbs Phase Rule
Lecture 77 - Fe-C Phase Diagram
Lecture 78 - Eutectoid, Hypoeutectoid and Hypereutectoid Steels
Lecture 79 - Microstructure of a Hypoeutectoid Steel
Lecture 80 - Microstructure of a Hypereutectoid Steel
Diffusion
Lecture 81 - Diffusion: Introduction
Lecture 82 - Fick's First Law
Lecture 83 - Fick's Second Law
Lecture 84 - Error Function Solution of Fick's Second Law
Lecture 85 - Atomic Mechanisms of Diffusion
Lecture 86 - Substitutional Diffusion Revisited
Lecture 87 - Diffusion Paths
Lecture 88 - Steady and Unsteady State Diffusion
Phase Transformations
Lecture 89 - Phase Transformations
Lecture 90 - Nucleation
Lecture 91 - Nucleation and Capillary Rise
Lecture 92 - Nucleation, Growth and Overall Transformation
Lecture 93 - TTT (Time-Temperature-Transformation) Diagram
Lecture 94 - Homogeneous and Heterogeneous Nucleation
Lecture 95 - Heat Treatment of Steels
Lecture 96 - TTT Diagram of Eutectoid Steels
Phase Transformations, Mechanical Behaviour of Materials
Lecture 97 - Quenching and Martensite
Lecture 98 - Austempering and Bainite
Lecture 99 - Tempering
Lecture 100 - Residual Stresses and Quench Cracks
Lecture 101 - Marquenching and Martempering
Lecture 102 - TTT Diagram of Hypoeutectoid and Hypereutectoid Steels
Lecture 103 - TTT Diagram of Alloy Steel
Lecture 104 - Hardenability of Steels
Lecture 105 - Glass Ceramics
Lecture 106 - Tensile Test
Lecture 107 - Plastic Deformation and Crystal Structure
Lecture 108 - Shape Change without Change in Crystal Structure
Lecture 109 - Slip
Lecture 110 - Resolved Shear Stress
Lecture 111 - CRSS (Critical Resolved Shear Stress)
Lecture 112 - Schmid's Law
Mechanical Behaviour of Materials
Lecture 113 - CRSS: Theory vs Experiment
Lecture 114 - Why is Experimental CRSS Less Than Theoretical CRSS?
Lecture 115 - Strengthening Mechanisms
Lecture 116 - Dislocation Density
Lecture 117 - Frank-Reed Source
Lecture 118 - Strain Hardening
Lecture 119 - Dislocation Interaction Leading to Strain Hardening
Lecture 120 - Dislocation Interaction Leading to Strain Hardening (cont.)
Lecture 121 - Solid Solution Hardening
Lecture 122 - Grain Size Hardening
Lecture 123 - Age Hardening
Lecture 124 - Age Hardening (cont.)
Lecture 125 - Metastable Precipitates
Lecture 126 - Annealing of Cold-Worked Metals
Lecture 127 - Recovery
Lecture 128 - Recrystallization
Lecture 129 - Grain Growth
Lecture 130 - True Stress and True Strain
Lecture 131 - Creep
Lecture 132 - Effect of Stress and Temperature on Creep
Lecture 133 - Creep Mechanisms
Lecture 134 - Composites
Lecture 135 - Isostrain Modulus
Lecture 136 - Isostress Modulus
Fracture
Lecture 137 - Fracture
Lecture 138 - Ductile and Brittle Fracture
Lecture 139 - Role of Crack Size
Lecture 140 - Griffith's Criterion
Lecture 141 - Stress Concentration
Lecture 142 - Ductile to Brittle Transition
Lecture 143 - Enhancing Fracture Resistance
Lecture 144 - Toughening of Glass: Tempering
Lecture 145 - Toughening of Glass: Ion-Exchange
Lecture 146 - Fatigue
Lecture 147 - Subcritical Crack Growth