Aluminium alloys: Duralumin, Y-alloy, Magnalium, Hindalium

Aluminium alloys



The aluminium may be easily alloyed with other
elements like
copper, magnesium, zinc, manganese, silicon and nickel to
improve various properties. The addition of small quantities of alloying
elements into other metals helps to converts the soft and weak metal into hard
and
strong metal, while still retaining its light weight. Various
aluminium alloys are

1. Duralumin  

2. Y-alloy

3. Magnalium 

4. Hindalium

These alloys are discussed as below

1. Duralumin



It is an important wrought alloy. Its
composition contains following chemical contents.

Copper = 3.5-4.5 %

Manganese = 0.4 – 0.7 %

Magnesium = 0.4- 0.7 %

Aluminium = 94 %



Properties



Duralumin can be very easily forged,
casted and worked because it possesses low melting
point. It has high tensile strength,
comparable
with mild steel combined with the characteristics lightness of Al. It however possesses low
corrosion resistance and high electrical
conductivity.
This alloy possesses higher strength after heat treatment and age hardening. After working, if this alloy is
age hardened for 3 or 4 days. This phenomenon is known as age hardening.
     It hardens spontaneously when exposed to
room temperature. This alloy is soft enough
for    a workable period after it has been
quenched. It is light in weight as compared to its strength in comparison to
other metals. It can be easily hot worked at a temperature of 500°C. However
after
forging and annealing, it can also be cold worked.

Applications



Duralumin is used in the wrought
conditions for forging, stamping, bars, sheets, tubes, bolts, and rivets. Due to its higher strength and lighter
weight, this alloy is widely used in automobile and aircraft
components. To improve the strength of duralumin sheet, a thin film of Al is rolled along with this sheet.
Such combined sheets are widely used in air-craft industries. It is also
employed in surgical and orthopedic work, non-magnetic work and measuring
instrument parts constructing
work.

2. Y -alloy



Y-Alloy is also called copper-aluminium alloy. The
addition of copper to pure aluminium increases its strength and machinability.
Its composition contains following chemical contents.

Copper = 3.5-4.5 %

Manganese = 1.2 – 1.7 %

Nickel = 1.8 – 2.3 %

Silicon, Magnesium, Iron = 0.6 % each

Aluminium = 92.5 %


Properties



The addition of copper in
aluminium increases its strength and machinability.
Y-alloy can be easily cast and hot worked. Like
duralumin, this alloy is heat treated and age hardened. The
age-hardening process of Y-alloy is carried out at room temperature
for about five
days.

Applications

Y-Alloy is mainly used for cast purposes, but it can also be used for
forged components like duralumin. Since Y -alloy has better strength than
duralumin at high temperatures, therefore it is much used in aircraft engines
for cylinder heads, pistons, cylinder heads, crank cases of internal combustion engines die casting,
pump rods etc.

Magnalium

Magnalium is an alloy of aluminium, magnesium, copper,
nickel and tin etc. It contains

Al =85 to 95%

Cu= 0 to 25%

Mg=1 to 5%

Ni=0 to 1.2%

Sn=0 to 3%

Fe= 0 to 0.9% 

Mn=0 to 0.03%

Si= 0.2 to 0.6%

It is made by melting the
aluminium with 2-10% magnesium in a vacuum and then cooling it in a vacuum or
under a pressure of 100 to 200 atmospheres.


Properties

Magnalium is light in weight and
brittle. This alloy possesses poor castability and good machinability. It can
be easily welded.

Applications

Due to its light weight and good
mechanical properties, it is mainly used for making aircraft and automobile
components.


Hindalium

Hindalium is a common trade name of aluminium
alloy. It is an alloy of aluminium, magnesium,
manganese, chromium and silicon etc. In India, it is produced by Hindustan Aluminium Corporation Ltd., Renukoot (U.P.). Hindalium is commonly produced as a
rolled product in 16 gauges. Utensils manufactured by this alloys are strong and
hard, easily cleaned, low cost than stainless steels, having fine finish,
having good scratch resistance, do not absorb much heat etc.

Applications

Hindalium is mainly used for manufacturing anodized utensil. Utensils
manufactured by this alloys
are strong and hard, easily cleaned, low cost than stainless steels, having
fine finish,
having good scratch resistance, do not absorb
much heat etc.

Aluminium alloys: Duralumin, Y-alloy, Magnalium, Hindalium

6 thoughts on “Aluminium alloys: Duralumin, Y-alloy, Magnalium, Hindalium”

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