C15 : 15.2 - Useful alloys Flashcards
1
Q
what are alloys
A
mixture of two or more elements, at least one of which is a metal - not chemically combined
2
Q
why are alloys more stronger and harder than pure metals
A
- pure metals have a regular structure of positive ions arranged in a giant lattice
- these layers can easily slide over each other - making metal soft and easily shaped
- alloys have different-sized metal ions which distort the regular layers and make it difficult for them to slide over each other - so stronger
3
Q
what are some props that alloys have that are diff to the metals they contain
A
- stronger/harder
- resistance to corrosion
- resistance to extreme temps
4
Q
alloy is a compound - TRUE OR FALSE
A
FALSE
5
Q
what is bronze an alloy of
A
copper + tin
6
Q
features and uses of bronze
A
- more harder than copper
- statues and decorative items + ships’ propellers because of toughness
7
Q
what is brass an alloy of
A
copper + zinc
8
Q
features and uses of brass
A
- more malleable than bronze
