I was wondering if you could mold clay into a sphere then fill it with aluminum. Then put it over a fire and wait until the aluminum melts then put it in a freezer and it would come out as a sturdy, aluminum sphere. Thanks!
Do not try this at home! Seriously, this is exactly the kind of process that is used for casting metals. However, you need to have very strong molds with no cracks in them. Also, aluminum presents special problems. Solid aluminum does not corrode the way iron does, because it very quickly forms a protective tough layer of aluminum oxide. But molten aluminum can catch fire, with devastating consequences.
