I'm kind of confused. Don't we already know this? Pure iron has a low entropy, and it has a big list of material properties. But then, if you add some C/Ni/Cr

I'm kind of confused. Don't we already know this? Pure iron has a low entropy, and it has a big list of material properties. But then, if you add some C/Ni/Cr etc. to it, the entropy changes (not pure iron any more, it's now a mixture) and the material properties change significantly. Like: the pure iron will change from BCC to BCT when you add a bit of carbon, which changes the material properties significantly. So what is different about this process from that one? We have known these things about iron (and other metals) for decades, and we've known some of these processes for centuries.