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LOL thats the theory and it works really well if you say it fast wave hands and move on



https://en.wikipedia.org/wiki/Atomic_diffusion

That is why technically when you heat and cool anything over a large enough range it is never the same and why you get thermal fatigue even in the purest materials.

When you deal with complex materials you have micro crytals and this stuff gets even more mixed up and it has it's own discipline called material science.

The general problem in that is called heat treating
https://en.wikipedia.org/wiki/Heat_treating

Again what we think of as a very still lattice in classical physics isn't very still but it is a nice easy model to teach.