Here in the UK, we had a brief tangle with aluminium (or in your case, aluminum) branch circuit cables in the late 1960s. They were however "copperclad" conductors, with an aluminium core. It was, a very short lived type of cable and we went back solely to copper for such. I still find one or two houses with remnants of this and dread doing so. It is terrible to work with and the same problems as you had, with expansion happen all too often.
As in Germany and Austria, we now have a minimum size for this metal in cable, which is way above normal branch circuit sizes.
