Uh, I hate to break it to you, but literally all the iron in the human body is either part of a protein or bound to other molecules. It's not an alloy per se, but it isn't exactly pure iron
Really now? I thought most steel had way more carbon & chromium/nickel/manganese than that. I guess I underestimate how little is needed to make iron no longer mushy.
It is mainly only in stainless steels that have anything other than iron in high concentrations, they might have something like 30% of their weight elements other than iron
Sounds like aluminum is a loner and iron plays well with others. I'd bet there is still more iron encountered every day than aluminum even if the aluminum is pure and the iron is alloyed.
Perhaps so, but one might argue that human tech relies more on iron than any other metal - because of its magnetic properties. We need iron to generate and manipulate electricity.