I know that China, Japan, Korea (previously) mints coins in aluminum.
China used to mint them (not too sure) for fen, Japan for 1 yen, South Korea previously for 1 won but currently copper plated aluminum.
Vietnam previously minted some during the Vietnamese war if I am not mistaken. Indonesia too at one stage.
Some other countries that come to mind is France, Italy, Israel, Finland, Romania, Hungry etc. I'm sure there are plenty of African coins too but I can never remember them off the top of my head.
Thought pictures would be nice too:


Proof aluminum looks pretty "cold"





And of course, who can forget this

North Korean coins - obviously shows their economy status.
Post your picture if you have any
The good news about aluminum coins is that they are VERY cheap!

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