Aluminum cutting can be tricky, it makes a mess with the angle grinder (even with the proper discs), and sticks to the regular hacksaw blades. The new kind of grinder with the two discs could be an option (fury twin blade or equivalent). I tested another one: mounting a bandsaw blade (for cutting metal) on a hacksaw frame. The bandsaw blade has less teeth per inch and bigger teeth so I figured the aluminum would be less prone to stick, and it works like a charm. You can see that the blade has some worn teeth but it was free so I can't complain about it
It cuts much better with a bit of lubricant, I suspect the bandsaw blades to have a thinner kerf.
What you see is a part of an aluminum electric bike frame which was damaged beyond repair. I cut the entire frame into bits in no time and it will be melted.