Steel Dental

i need help on examination of alloys?
1....what is duralium and how is it used?
2...name a lead alloy?
3...what differences are there between the alloys used to make 'gold' and 'silver' coins?
4....why stainless steel is more expensive then ordinary steel?
5... explain how nitinol wire is used in dental braces to straighten teeth?
6... what are the alloys of 10 cent coin and a 2 dollar coin?
7... at which percentage is the alloy the strongest?
a) 20
b) 40
c) 60
d) cant tell
if you could help me with any of the questions thanks very appreciated..
1)duralumin or duralium?
Duralumin is used for building aircraft.No idea whats duralium.
2)Alloys of lead?
Molybdochalkos (copper)
Solder (tin)
Terne (tin)
Type metal (tin, antimony)
3)No idea either.
4)Stainless steel is an alloy combined with chromium to give it a shiny appearance and stainless property.
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