Aluminium - Lower density than steel, high corrosion resistance, more expensive than steel and not as strong, often alloyed to improve properties.
Titanium - Stronger than aluminium, excellent corrosion resistance, lower density than steel but more expensive.
Zinc - Low melting point (so ideal for die casting), can be alloyed with aluminium and this increases it's strength.
Copper - Good conductor of electricity, flexible, lack strength, alloyed with copper oxide to add strength.
Bronze (alloy of copper and tin) and Brass (alloy of copper and zinc) - Bronze is often used for casting whereas brass is hard to cast but can be machined to create a good surface finish.
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