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Theory (Metals and Alloys (. (Malleable metals, Can be hammered into a…
Theory
Metals and Alloys
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Ferrous metals contain iron and may rust
Iron and steel can corrode – this is known as rust
Rust is a compound called iron oxide and is formed when iron and oxygen react in the presence of moisture or water
Most ferrous metals are magnetic
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drawn into long, thin wires
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Non ferrous metals such as copper and
bronze, don’t rust, but may oxidise
Hardness – a material’s ability to withstand abrasion
A very hard metal is likely to crack or shatter upon impact or force. Cast iron would be described as hard and brittle
Toughness – metal requires
strength and ductility
This is how well a metal can
absorb energy and resist
fracturing without deforming
Tensile strength is the amount of tensile stress (stretching) a material can withstand before breaking or failing
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Timbers
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Agricultural logging uses machinery with large chainsaw attachments.
These can fell, de-branch and log a tree in one swift action
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soft wood
Softwood comes from coniferous trees Most coniferous trees have needles, are evergreen, and they keep their needles all year round Softwood trees grow faster than hardwood trees making it relatively cheap and readily available The grain is wider making it more absorbent
Polymers
What are polymers?
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They are usually derived from finite resources like natural gas, crude oil and coal.
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