Maybe Sintered Aluminum? I looked it up and it exists, although I don't know if it would be feasable to use in this application. I saw no properties correlation to other grades i.e. 2024,7075, A356, etc.
I used to machine pure sintered Molybdenum for high temperature parts. It would leave a powdery dust insted of chips. It also chipped off on edges so you had to be careful of cutters and toolpaths. In some respects it machined like cast metals.
You might ask them about it, I'd be interested to know too.