That's why I tried to keep it simple instead of copy-and-pasting a big old block of text from Aluminum sales sites on the Internet.

The gist of it is that there ARE Aluminum alloys that will work. But there's usually a drawback of one kind or another. Typically, the drawback comes back to cost (of material, manufacturing, or both). So we tend to use steel.

After all, if perfection were wanted and money was no object, we'd make parts out of a high-grade Titanium alloy. Would be most spectacular.