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MEC208:MATERIAL SCIENCE

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Course Objectives:

To underastand how the material properties affect their function

To understand how the material properties are varied by alloying

To know the testing and analysis of materials

Unit I

Introduction to material science and engineering : History of materials,

Introduction to material science and engineering, Classification of materials, Materialdesign and selection, Terminology for mechanical properties, The tensile test, Use of

stress-strain diagram, Properties obtained from tensile test, True stress and true

strain, Hardness of materials, Strain rate effects and impact behavior, Glossary

(relevant topics only)

Unit II

Atomic arrangements : Short-range order vs. Long-range order ionic

arrangements, Amorphous materials, Lattice basis, Unit cells and crystal structures,

Allotropic or polymorphic transformations, Points directions and planes in the unit cell

Unit III

Imperfections in the atomic arrangements : Introduction, Point defects,

Dislocations, Significance of dislocations, Schmids law, Influence of crystal structure,

Surface defects, Importance of defects

Unit IV

Principles of solidification : Nucleation and growth mechanisms, Atom and ion

movements in materials, Diffusion, Applications of diffusion, Mechanisms for

diffusion, Rate of diffusion, Factors affecting diffusion, Composition profile

Unit V

Solid solutions and phase equilibrium : Phases and the phase diagram, Solubility

and solid solutions, Conditions for unlimited solid solubility, Solid solutionstrengthening, Isomorphous phase diagrams, Relationship between properties and

phase diagram, Solidification of a solid-solution alloy, Non-equilibrium solidification

and segregation

Unit VI

Dispersion strengthening and eutectic phase diagrams : Principles and

examples of dispersion strengthening, Intermetallic compounds, Phase diagrams

containing three phase reactions, The eutectic phase diagram, Strength of eutecticalloys

Unit VII

Dispersion strengthening by phase transformations : Nucleation and growth in

solid-state reactions, Alloys strengthened by exceeding the solubility limit, Age or

precipitation hardening, Microstructural evolution in age or precipitation hardening,

Effect of aging temperature and time, The eutectoid reaction, Controlling theeutectoid reaction, The martensitic reaction and tempering

Unit VIII

Strain hardening and annealing : Relationship of cold working to the stress strain

curve, Strain-hardening mechanisms, Properties Vs percent cold work,

Microstructure, Texture strengthening and residual stresses, Characteristics of cold

working, The three stages of annealing, Control of annealing

Unit IX

Heat treatment of steel : Designations and classification of steels, Simple heat

treatments, Isothermal heat treatments, Quench and temper heat treatments, Effect

of alloying elements, Application of hardenability, surface treatments

Credits:3

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Unit X

Cast irons and alloy steels : Cast Irons and types, Speciality steels, Stainless

steels

Text Books:

1. The Science and Engineering of Materials by Askeland, Fulay, Wright & Balani,Cengage Learning, 6th Edition (2011)

References:

1. Material Science & Engineering by Raghavan, Prentice Hall of India, 5th Edition

(2004)

2. Material science and engineering by William D Callister, Wiley, 8th Edition (2007)

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