07-26-2014, 11:08 AM
Aluminium and aluminium alloys
Al and its alloys are characterized by :
relatively low density (2.7 g/cm3 as compared to 7.9 g/cm3 for steel),
high electrical and thermal conductivities,
resistant to corrosion in some common environments, including the ambient atmosphere.
Many of these alloys are easily formed due to high ductility;
thin aluminum foil sheet (of relatively pure material) may be rolled.
its ductility is retained even at very low temperatures.
White shiny colour
Light and good endurance
No toxic Cheap Stainless
The chief limitation:
low melting temperature [660°C], restricts the maximum temperature at which it can be used.
The mechanical strength of aluminum may be enhanced by cold work and by alloying;
However, both processes tend to diminish resistance to corrosion.
Principal alloying elements include copper, magnesium, silicon, manganese, and zinc.
Non heat-treatable alloys consist of a single phase,
for which an increase in strength is achieved by solid-solution strengthening.
![[Image: al1.jpg]](http://www.frontdesk.co.in/big/cm/al1.jpg)
![[Image: al2.jpg]](http://www.frontdesk.co.in/big/cm/al2.jpg)
Rendered heat treatable
capable of being precipitation hardened as a result of alloying.
In several of these alloys precipitation hardening is due to the precipitation of two elements other than aluminum, to form an intermetallic compound such as MgZn2.
Al and its alloys are characterized by :
relatively low density (2.7 g/cm3 as compared to 7.9 g/cm3 for steel),
high electrical and thermal conductivities,
resistant to corrosion in some common environments, including the ambient atmosphere.
Many of these alloys are easily formed due to high ductility;
thin aluminum foil sheet (of relatively pure material) may be rolled.
its ductility is retained even at very low temperatures.
White shiny colour
Light and good endurance
No toxic Cheap Stainless
The chief limitation:
low melting temperature [660°C], restricts the maximum temperature at which it can be used.
The mechanical strength of aluminum may be enhanced by cold work and by alloying;
However, both processes tend to diminish resistance to corrosion.
Principal alloying elements include copper, magnesium, silicon, manganese, and zinc.
Non heat-treatable alloys consist of a single phase,
for which an increase in strength is achieved by solid-solution strengthening.
Rendered heat treatable
capable of being precipitation hardened as a result of alloying.
In several of these alloys precipitation hardening is due to the precipitation of two elements other than aluminum, to form an intermetallic compound such as MgZn2.