Question

Describe the solidification of a pure metal with a neat sketch

Answer 1

The process of solidifying happens when the chemical potential of the liquid phase is the same as the potential if the solid phase, when cooling. Thermodynamicaly, it becomes spontaneous for that matter, the metal atoms, to solidify and crystallize.

Those atoms transition into the solid aggregation state in a process that creates spherical structures, named embryos. When that happens, the atoms on the surface are subjected to the interactions with both the atoms inside this structure and the liquid ones. When the created embryo becomes big enough, the grain growth becomes spontaneous and it grows and solidifies. When that doesn't happen, that embryo liquefies back. As these processes happen in a short period of time, some embryos nucleate and grow.

The spontaneity of that phase change is related to the supercooling, what means that metals in temperatures much colder that their “melting temperature” will solidify, thus crystallize if given enough time at high enough temperatures, faster.

I hope this will help you
if you got your answer please Mark this as brainlist