Off the top of my head...
Al is pretty soft, and some endmills are available specifically for it.
Copper is much harder, but can still "stick" to the cutting tool. Endmills are usually 2 or 3 flutes, preferably TIN coated (not more, not less), and made of either HSS (high speed steel) which is often a poor choice, cobalt HSS or carbon steel.
If you want specifics: Google!
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