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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 44 - Vacancies

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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