5. Properties of Materials
1. Mechanical Properties
2. Thermal Properties
3. Electrical Properties
4. Magnetic Properties
5. Chemical Properties
6. Optical Properties
7. Physical Properties
8. Technological Properties
6. Mechanical Properties
1. Strength:
It is the capacity to withstand destruction when external
forces are applied.
2. Elasticity:
It is the ability of a material to regain its original shape
and size when external force causing the deformation is
removed.
3. Plasticity:
It is the ability of a material to undergo permanent
deformation.
4. Rigidity:
It is the ability of a material to resist the deformation.
5. Ductility:
It is the ability of a material to draw out into thin wires.
7. 6. Malleability:
It is the ability of a material to be flattened into thin sheets.
7. Resilience:
It is the ability of a material to absorb energy.
8. Hardness:
It is the ability of a material to resist scratching, abrasion etc
9. Brittleness:
It is the property of breaking out without much deformation.
8. Alloys
• Alloy is a metal made by combining two or more metallic
elements, especially to give greater strength or resistance
to corrosion.
• The metal present in the alloy in largest proportion is
called base element.
• All other elements present in the form of metal or non
metal are called alloying elements.
9. Aluminium Alloys
• The aluminium alloys are hard and strong and retain the light
weight of aluminium
Aluminium-Silicon alloys
Aluminium-Copper alloys
Aluminium-Magnesium alloys
Application of aluminium alloys
Used in the production of cars and engine parts.
Aircrafts, military, commercial, industrial, medical, residential
and manufacturing applications
10. Copper alloys
• Copper alloys are useful on account of their heat and electrical
conductivity, good cold and hot working properties.
• Copper-Tin Alloys
Used in airtight seals
Used for sleeve bearing
Used in the manufacture of all types of electrical
equipment.
11. Stainless Steel
• Stainless steel has great strength and toughness and good
resistance to corrosion and heat.
Used for many commercial applications such as watch
straps
All type of surgical and dental instruments
Household appliances etc
