L1 /
5
CH1012
METAL ALLOYS III
• Alloys are prepared at the final stage
in
metallurgy where the required alloying elements are added to the molten metal.
metallurgy where the required alloying elements are added to the molten metal.
• Alloying changes properties such
as
1) lustre sterling silver Ag 92.5 Cu 7.5
1) lustre sterling silver Ag 92.5 Cu 7.5
2) malleability dental amalgam
Ag 70 Sn 18 Cu 10, Hg 2
Ag 70 Sn 18 Cu 10, Hg 2
3) ductility permalloy ocean cables
Ni 78 Fe 22
Ni 78 Fe 22
4) hardness tungsten steel Fe 80 W 20
5) melting point tin solder
Pb 67 Sn 33
mp. 275oC (c.f. Pb 327oC, Sn 232oC)
mp. 275oC (c.f. Pb 327oC, Sn 232oC)
6) corrosion stainless steel Fe 72 Cr 18 Ni 1
