Nickel Super

What are the seven different types of Non-Ferrous Alloys?
well i got six types , aluminium alloys, magnesium alloys, copper alloys, nickel alloys, titanium alloys and super alloys but dont get the rest one.
Others include
Brazing Alloys
Cobalt Alloys
Zinc Alloys
Molybdenum Alloys
Tungsten Alloys
Take your pick! you can research all of these.
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