First up, you should have no problem whatsoever cutting alu with carbide.
The funny thing is, I do exactly the opposite: I got an aluminium cutting carbide blade from my sawdoctor; it has very close set teeth and a negative rake on it and I use this blade for super clean wood cutting - for instance when I use MDF panels with .5mm real wood veneer for frame and panel - with an ordinary sawblade this veneer will chip back up to 3mm from the (trailing) edge, with the aluminium cutting blade it doesn't. Cost me a small fortune but worth every cent :-)
-P.