Physical properties of metal
Metals have different properties. Depending on the type of application, different metals are selected. Physical properties of metals
Colour
Weight/Specific gravity
Structure
Conductivity
Magnetic property
Fusibility
Color :- Different metals have different colors . For example, copper is of a distinctive red color. Mild steel is of a blue/black sheen.
Weight :-Metals differ based on their weight. A metal, like aluminum , weighs lighter (specific gravity 2.8) than many others, and a metal, like lead, is heavy .
Structure :-Generally metals can also be differentiated by their internal microstructure. Metals like wrought iron and aluminum will have a fibrous structure, and metals like cast iron and bronze will have a granular structure.
STRUCTURE
OF
METAL
Conductivity:- Thermal conductivity and electrical conductivity are the measure of the ability of a material to conduct heat and electricity. Conductivity will vary from metal to metal. Copper and aluminum are good conductors of heat and electricity.
Magnetic property : A metal is said to possess magnetic property, if it is attracted by a magnet .Almost all ferrous metals, excepting some types of stainless steel, can be attracted by a magnet and all non-ferrous metals and their alloys will not be attracted by a magnet.
Fusibility :- It is the property possessed by a metal by virtue of which it melts when heat is applied. Many materials are subject to the transformation in shape (i.e.) from solid to liquid at different temperatures. Tin has a low melting temperature (232ºC)and tungsten melts at a high temperature (3370ºC).
Specific gravity :-It is the ratio between the weight of the metal and the weight of equal volume of water.
Mechanical Properties
The mechanical properties of a metal are
• ductility
• malleability
• hardness
• brittleness
• toughness
• tenacity
• elasticity
Ductility :- A metal is said to be ductile when it may be drawn out in tension without rupture. Wire-drawing depends upon ductility for its successful operation. A ductile metal must be both strong and plastic. Copper and aluminum are good examples of ductile metals.
Malleability :- Malleability is the property of permanently extending in all directions without rupture by hammering, rolling etc. to change its size and shape. Lead is a very malleable metal.
Hardness :-Hardness is a measure of a metal’s ability to withstand scratching, wear, abrasion and penetration.
Brittleness:- Brittleness is the property of a metal which permits no permanent distortion before breaking. Cast iron is an example of a brittle metal, and it will break rather than bend under shock or impact.
Toughness :-Toughness is the property of a metal to withstand shock or impact. Toughness is the property opposite to brittleness. Wrought iron is an example of a tough metal.
Toughness :-Toughness is the property of a metal to withstand shock or impact. Toughness is the property opposite to brittleness. Wrought iron is an example of a tough metal
Elasticity :- Elasticity of a metal is its power of returning to its original shape after the applied force is released. Properly heat-treated spring is a good example of elasticity.
Specific gravity :- It is the ratio between the weight of the metal and the weight of equal volume of water.
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