You need a negative rake blade for cutting aluminium and as far as I know any blade listed as for cutting metal will have that negative rake, I use them a lot (DW712) and have not found any that don't.
Usual advice to a degree. better cuts with more teeth, Hold the workpiece FIRMLY.
DON'T cut without safety glasses
try not to cut small pieces off, I have seen too many offcuts flying around to be healthy.
If you do have to cut small bits, use some timber to put the angle on and cut through the lot.
Don't lift the blade until it has stopped, the offcut WILL pick up, and even following these rules I have had to replace the fence on my 712 as an offcut took a large chunck out of it :!: :!:
I have been doing this for years and still have a VERY healthy respect for what can happen. (pieces stuck in walls and ceilings spring to mind)
Just hope this doesn't put you off :lol: :lol: :lol: