The making of alloy is:
- To increase the strength and hardness of a pure metal.
- To prevent corrosion.
- To improve the appearance of a pure metal.
Pure Metal |
· Pure metal is made up of one type of atoms that are in same size. Therefore, when a force is applied, the layers of atoms can slide over one another. Thus, metals are ductile or can be stretched. · There are some empty spaces in between the pure metal atoms. When a metal is knocked or pressed, groups of atoms may slide and then settle into new positions. Thus, metals are malleable or can be shaped. |
Alloy |
· Some of the spaces between the metal atoms are filled up by the foreign atoms which may be bigger or smaller than the original metal atoms. · The presence of foreign atoms disrupts the orderly arrangement or the pure metal. · The layers of metal atoms are prevented from sliding over one another easily. This makes alloys stronger and harder than pure metals. |
Examples of alloy
Alloy | Composition |
Steel | 99 % iron + 1 % carbon |
Stainless steel | 74 % iron + 18 % chromium + 8 % nickel |
Bronze | 90 % copper + 10 % tin |
Brass | 70 % copper + 30 % zinc |
Magnalium | 70 % aluminium + 30 % magnesium |
Duralumin | 95 % aluminium + 4 % copper + 1 % magnesium |
Pewter | 97 % tin + 3 % lead and antimony |
Solder | 50 % tin + 50 % lead |
cupronickel | 25 % copper + 75 % nickel |
1 comment:
What is the operational definition of Alloy?
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