In the mid-70s some photo mag had an article covering mounting prints on aluminum. The idea was to lessen exposure of the print to the atmosphere by isolating the back side. As an experiment, I mounted some B&W prints on aluminum foil (Reynolds Wrap) with dry mount tissue, then mounted the aluminum foil to a piece of mount board, again with standard dry mount tissue. So, I would think dry mounting would work with aluminum sheets.

I still have a couple of the prints. While I can't say if the process helped preserve the prints, it doesn't seem to have harmed them.
juan