Why is cementite listed on the iron-carbon phase diagram as a distinct chemical formula instead of a Greek letter like Beta?

The equation represents a __________ reaction.  

If the metal goes under diffusion for an infinite length of time, the concentration of the metal is

The diffusion process in which the internal concentration of a certain element is increased is called

Resistance to creep can be accomplished by using single crystal materials. 

During steady state diffusion, the diffusion flux “J” is linearly proportional to the concentration gradient.

The ductile-to-brittle transition temperature is the temperature where the impact energy of a material

Interstitial impurities such as carbon can form binary isomorphous phase diagrams with large elements like iron.

Why would drilling a hole at the end of a crack prevent crack propagation?

Are cold work metals suitable for high-temperature service? Why or Why not? Provide a clear explanation on what happens in the material by explaining the start and end microstructure.