Beauty of Solidification

Hey mechanical jigs ... and some still guessing what is it? Tropical tree like structure or a photo-shop miracle.Read some where about it?It seems soft and is a solidification process of one of the hardest metal.

Its enough..enough hints... its DENDRITE.Dendrite like structure formed during transformation of molten iron to ingot iron.This pic is obtained from my HODs authority.Download it quick.It looks wonderful as a wallpaper.For all mechanical s, who love and live mechanical.

A liquid when cooled solidifies. Alternatively, it may solidify when the pressure is decreased or increased, depending on the sign of the density change. Once nucleation has occurred, solidification proceeds by the movement of an interface. The process may generate heat if the enthalpy of the solid is less than that of the liquid. Similarly, solute may partition into the liquid if its solubility in the solid is less than that in the liquid.
The accumulation of solute and heat ahead of the interface can lead to circumstances in which the liquid in front of the solidification front is supercooled. The interface thus becomes unstable and in appropriate circumstances solidification becomes dendritic. The mechanism of this instability is discussed elsewhere.

A dendrite tends to branch because the interface instability applies at all points along its growth front. The branching gives it a tree-like character which is the orgin of the term dendrite.