We have considered coating the part first and then machining the uncoated sections but we are still reviewing other options. I'm trying to figure out if there is an aluminum alloy that can withstand plastic deformation while it is being baked to 500oF (during coating process).
Design...
I'm been given a project to find an aluminum alloy that can be cast, machined, and coated. After the part is machined it has to be coated with a baked on phonolic coating at 500oF. Current material used is Al 319---the "critical" dimensions on the part do not shrink back to size after coating...
