Metal alloys are generally harder and stronger than the individual elements they are made from. This is because the atoms of each element are of a different size and therefore:Lead to an decrease in boiling pointLead to an increase in boiling pointIncrease the size of the latticeDisrupt the regular layers of ions, making them less malleable2Which alloy is formed from copper and tin?BronzeSteelBrassWhite gold3What is the key property of aluminium alloys?Low densityResistance to corrosionBrittlenessStrength4Which of the following statements about steels is not true? High carbon steel is very strong, but brittleSteels are alloys of iron with carbon and/or other elements such as nickel or chromiumStainless steels are hard and strong, but can rust easilyLow carbon steel is softer and less brittle than high carbon steel

Explain why alloys are harder than pure metals.[3 marks]

Aluminium is a metal. An aluminium alloy is an alloy where tin is the main component. An example of this is duralumin.Duralumin is harder than aluminium.Explain why duralumin is harder than aluminium.Duralumin contains atoms of different sizes and shapes. These distort the regular arrangement of the aluminium atoms. As a result, the layers are unable to slide over each other.Duralumin contains atoms of the same sizes and shapes. These distort the irregular arrangement of the aluminium atoms. As a result, the layers are able to slide over each other.Duralumin contains molecules of different sizes and shapes. These distort the regular arrangement of the aluminium atoms. As a result, the layers are able to slide over each other.Duralumin contains compounds of the same sizes and shapes. These distort the irregular arrangement of the aluminium atoms. As a result, the layers are unable to slide over each other.

What are effects of alloying on resistivity of metals?

explain why alloys are harder than puremetals in terms of distortion of the layers of atoms in the structure ofa pure metal

Titanium:Advantages:High strength-to-weight ratio: Titanium alloys offer a better strength-to-weight ratio than aluminum and magnesium.Superior Corrosion Resistance: Titanium exhibits very good corrosion resistance in an aggressive environment.High temperature resistance: Titanium still can keep the strength at high temperature, so it can be applied for components in engines.Limitations:Cost: Compared to both aluminum and magnesium, cost of titanium is very high, which limits the scope of usage in cost-sensitive applications.Complexity of Manufacture: Titanium alloys are more difficult to process and make than aluminum and magnesium, which increases the costs of manufacturing.