Material Science - Introduction
Syllabus (GATE ME)
Structure and Properties of Engineering Materials
Heat Treatment of Materials
Stress Strain Diagram
Structure & Properties of Materials
Property of material depends on its structure and processing
Structure - How the atoms/molecules are arranged
Property - Performance in an engineering application in given condition
Properties are categories as:
Optical Properties etc.
Why Material Properties are important
To select a suitable material for a given application.
Suppose we want to design a cryogenic engine. Requirement of material for this application are:
•Compatibility with Fuel and Oxidizer
•Strength and Ductility at Cryogenic Temperature
Hence to choose a suitable material for this engine property data is critical.
Metals - Characterized by free electrons. Good thermal and electrical conductivity. Example: Al, Steel, Titanium etc.
Ceramics - Compound between metallic and non-metallic elements mostly oxides, carbides and nitrides. Typically insulator to heat and electricity. Hard but very brittle and maintains strength at high temperature.
Polymers - Long chain organic compounds such as plastics and rubber. Low density and extremely flexible
Composite - Composite is a combination of two material types and exhibits best characteristics from both of its constituent materials. Example - Fiberglass