This is great stuff and insightful as well thanks for that. Now I’m really getting excited.It's cool, I see what you are saying.
As for working the material, I dont know. I do know you can change the alignment of the molecular structure. Whether or not that alters density, that would require a metallurgist to answer.
GetAgrippa Agreed, hammering will alter surface tension but should not change density overall.I know hot-forged metal-like traditional cymbal makers-are stronger than cast metals. I'm pretty sure the heat and hammering alter the crystalline structure but I don't think it changes the density of the metal (that stays constant I would think).