An alloy is a mixture of a metal and one or more other elements, in most cases the second component of the mixture is also a metal. Alloys are desirable (more wanted) because the mixture of elements usually have properties different and superior to the properties of an individual metals.

1. Alloy
Done By: MAHABA TOSHY

2. What is Alloy?
An alloy is a mixture of a metal and one or more other elements, in
most cases the second component of the mixture is also a metal.
Alloys are desirable (more wanted) because the mixture of
elements usually have properties different and superior to the
properties of an individual metals.

3. E.g. many alloys that contain iron are harder, stronger,
and more resistant to oxidation that iron itself.

4. Steel is an example in which a
relatively small number of carbon
atoms slip in the gaps between the
huge atoms in a crystalline of iron.
Brass, for example, based on
copper in which atoms of zinc
replace 10–35 percent of the
atoms.

5. Structures and
Preparation of Alloys
Alloys generally crystallize in one of two ways:-
1. depending on relative sizes of atoms If the atoms of
one of the metals are small enough to fit into the
spaces between the atoms of the second metal they
form an alloy with an interstitial structure (inter
means “between,” and stitial means “to stand"}. If
two metals are of similar size or if one is larger, the
atoms of one metal can substitute for the atoms of the
second metal in its crystalline structure.

6. Structures and
Preparation of Alloys
2. depend on the metals used in the mixture In
some cases, the two metals can simply be melted
together to form a mixtures. In other cases, one
metal may be melted first and the second
dissolved in it. Brass is prepared in this way. If
copper and zinc were heated together to a high
temperature, zinc would evaporate before copper
melted. Therefore, the copper is melted first, and
the zinc is added to it.

7. Alloy's name Composition Use
Brass Copper (Cu), zinc (Zn), lead
(Pb) and tin (Sn)
Expensive jewelry, piping
Bronze Copper and tin Coins, medals, electrical
hardware
Coin medal Copper and nickel Unites sate coins
Duralumin Aluminum, copper,
magnesium, and manganese.
aircraft, boats, railroad
cars, and machinery
because of its high strength
and resistance to corrosion
Sterling silver Silver and copper Jewelry, flatware, medical
tools, musical instruments.
Amalgam Mercury (45–55%), plus
silver, tin, copper, and zinc
Dental fillings.
White gold Gold, palladium, silver,
copper
Jewelry.

8. How do alloys behave?
People make and use alloys because metals don't
have exactly the right properties for a particular
job. Iron is a great building material but steel is
stronger, harder, and rustproof. Alloys always
show improvements over main metal individually
in one or more of their important physical
properties ( like strength, ability to conduct
electricity, ability to withstand heat, and so on). So,
alloys are stronger and harder than their main
metals, less malleable/ flexibility.

9. References
http://www.explainthatstuff.com
/alloys.html