Some recipes you missed:
HNIFE: TUNGSTEN + IRON + NICKEL
HNICV: TUNGSTEN + NICKEL + COPPER
SILVLUMIN: SILICON + ALUMINUM
GERMAN SILVER: COPPER + ZINC + NICKEL
BRASS: COPPER + ZINC
DELTA METAL: COPPER + IRON + ZINC
NISIL: SILICON + NICKEL
MU METAL: NICKEL + NICKEL + IRON (UGHHHHHHHHHHHHH)
GUNMETAL: COPPER + TIN + ZINC
honestly someone should write like a guide for this game lol its shockingly complicated
8/12/22 EDIT: titanium doesn't even have any applicable recipes and yet its still an alloy mixing option. incredible
so yeah uh you're welcome in advance.